MP2633 Datasheet by Monolithic Power Systems Inc.

HIPS?
MP2633
1.5A Single Cell Switch Mode Battery Charger
with Power Path Management and Boost OTG
MP2633 Rev. 1.08 www.MonolithicPower.com 1
4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP2633 is a highly-integrated, flexible,
switch-mode battery charge management and
system power path management device for a
single-cell Li-ion and Li-Polymer battery used in
a wide range of portable applications.
The MP2633 has two operating modes—charge
mode and boost mode—to allow management
of system and battery power based on the state
of the input.
When input power is present, the device
operates in charge mode. It automatically
detects the battery voltage and charges the
battery in the three phases: trickle current,
constant current and constant voltage. Other
features include charge termination and auto-
recharge. This device also integrates both
input-current limit and input-voltage regulation
in order to manage input power and meet the
priority of the system power demand. .
In the absence of an input source, the MP2633
switches to boost mode through the MODE pin
to power the SYS pins from the battery. The
OLIM pin programs the output current limit in
boost mode. The MP2633 also allows an output
short-circuit thanks to an output disconnect
feature, and can auto-recover when the short
circuit fault is removed.
The MP2633 provides full operating status
indication to distinguish charge mode from
boost mode.
The MP2633 achieves low EMI/EMC
performance with well-controlled switching
edges.
To guarantee safe operation, the MP2633 limits
the die temperature to a preset value 120oC.
Other safety features include input over-voltage
protection, battery over-voltage protection,
thermal shutdown, battery temperature
monitoring, and a programmable timer to
prevent prolonged charging of a dead battery.
FEATURES
4.5V-to-6V Operating Input Voltage Range
Power Management Function Integrated
Input-Current Limit and Input-Voltage
Regulation
Up to 1.5A Programmable Charge Current
Trickle-Charge Function
Selectable 3.6V/ 4.2V Charge Voltage with
0.5% Accuracy
Negative Temperature Coefficient Pin for
Battery Temperature Monitoring
Programmable Timer Back-Up Protection
Thermal Regulation and Thermal Shutdown
Internal Battery Reverse Leakage Blocking
Reverse Boost Operation Mode for System
Power
Up to 91% 5V Boost Mode Efficiency @ 1A
Programmable Output Current Limit for
Boost Mode
Integrated Short Circuit Protection for Boost
Mode
APPLICATIONS
Sub-Battery Applications
Power-Bank Applications for Smart-Phone
Tablet and other Portable Device
A
ll MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks o
f
Monolithic Power Systems, Inc.
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MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 2
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TYPICAL APPLICATION
Table 1: Operation Mode
Power Source ACOK
__________ EN MODE Operating Mode
0.8V<PWIN<1.15V & VIN>VBATT+300mV Low
High
X
Charge Mode, Enable Charging
Low Charge Mode, Disable Charging
PWIN<0.8V or PWIN >1.15V or
VIN<VBATT+300mV High X High Boost Mode
VIN<2V High X Low Sleep Mode
X=Don’t Care.
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER UUUUUU flflflflflfl \UUUUUH flflflflflfl (5| >10 T1 ,
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 3
4/27/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
ORDERING INFORMATION
Part Number* Package Top Marking
MP2633GR QFN24 (4×4mm) M2633E
* For Tape & Reel, add suffix –Z (e.g. MP2633GR–Z);
PACKAGE REFERENCE
TOP VIEW
1
2
3
4
6
5
7 8 9101112
13
14
15
16
17
18
192021222324
FREQ
VIN
VCC
ILIM
PWIN
TMR
REG
ACOK
FB
NTC
ISET
OLIM
CHG
BOOST
CSP
BATT
VB
AGND
EN
MODE
SYS
SYS
SW
PGND
EXPOSED PAD
ON BACKSIDE
ABSOLUTE MAXIMUM RATINGS (1)
VIN ................................................. –0.3V to 20V
SYS ............................................... –0.3V to 6.5V
SW .....................................................................
-0.3V (-2V for <20ns) to 6.5V (8.5V for <20ns)
BATT ............................................. –0.3V to 6.5V
ACOK
-----------------
, CHG
-------------
, BOOST
---------------------
................... –0.3V to 6.5V
All Other Pins ................................ –0.3V to 6.5V
Junction Temperature ............................... 150°C
Lead Temperature .................................... 260°C
Continuous Power Dissipation (TA = +25°C) (2)
........................................................... 2.97W
Junction Temperature ............................... 150°C
Operating Temperature ............. –20°C to +85°C
Recommended Operating Conditions (3)
Supply Voltage VIN ............................ 4.5V to 6V
Battery Voltage VOUT ..................... 2.5V to 4.35V
Operating Junction Temp. (TJ). 40°C to +125°C
Thermal Resistance (4) θJA θJC
QFN24 (4×4mm)..................... 42 ........ 9 ... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-to-
ambient thermal resistance JA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/JA. Exceeding the maximum allowable powe
r
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
ij MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER Mode/Boost
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 4
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© 2016 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
VIN = 5.0V, TA = 25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
IN to SYS NMOS ON Resistance RIN to SYS 100 m
High-side PMOS ON Resistance RHDS
72 m
Low-side NMOS ON Resistance RLDS
70 m
High-Side PMOS Peak Current
Limit IPEAK_HS
CC Charge Mode/Boost
Mode 4 A
TC Charge Mode 1.5 A
Low-Side NMOS Peak Current
Limit IPEAK_LS 4.5 A
Switching Frequency fSW FREQ = 0 600 kHz
FREQ = Float/ High 1200
VCC UVLO VCC UVLO 2 2.2 2.4 V
VCC UVLO Hysteresis 100 mV
PWIN, Lower Threshold VPWIN L 0.75 0.8 0.85 V
Lower Threshold Hysteresis 40 mV
PWIN, Upper Threshold VPWIN H 1.1 1.15 1.2 V
Upper Threshold Hysteresis 65 mV
Charge Mode
Input Quiescent Current IIN EN = 5V, Battery Float 2.5 mA
EN = 0 1.5 mA
Input Current Limit IIN_LIMIT
RlLIM = 90.9k 400 450 500
mA
RlLIM = 49.9k 720 810 900
RlLIM = 20k 1800 2000 2200
Input Over-Current Threshold IIN
(
OCP
)
3 A
Input Over-Current Blanking
Time(5) τINOCBLK 120 µs
Input Over-Current Recovery
Time(5) τINRECVR 100 ms
Terminal Battery Voltage VBATT_FULL
Connect VB to GND 3.582 3.6 3.618
V
Leave VB floating or
connect to logic HIGH 4.179 4.2 4.221
Recharge Threshold VRECH
Connect to VB to GND 3.39 3.44 3.49
Leave VB floating or
connect to logic HIGH 3.95 4.01 4.07 V
Recharge Threshold Hysteresis 200 mV
Battery Over Voltage Threshold 103.3% VBATT FULL
Constant Charge (CC) Current ICC RS1 = 40m, RISET = 69.8k 900 1000 1100 mA
RS1 = 40m, RISET = 46.4k 1350 1500 1650
Trickle-Charge Current ITC 230 mA
ij MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 5
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© 2016 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5.0V, TA = 25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Trickle-Charge Voltage
Threshold VBATT_TC
Connect to VB to GND 2.47 2.57 2.67
V
Leave VB floating or connect
to high logic 2.9 3 3.1
Trickle-Charge Hysteresis 200 mV
Termination Charge Current IBF RS1=40m, RISET=69.8k 2.5% 10% 17.5% ICC
Input-Voltage-Regulation
Reference VREG 1.18 1.2 1.22 V
Boost Mode
SYS Voltage Range 4.2 6 V
Feedback Voltage 1.18 1.2 1.22 V
Feedback Input Current VFB=1V 200 nA
Boost SYS Over-Voltage
Protection Threshold VSYS(OVP)
Threshold over VSYS to turn
off the converter during
boost mode
5.8 6 6.2 V
SYS Over-Voltage Protection
Threshold Hysteresis V
SYS falling from VSYS(OVP) 125 mV
Boost Quiescent Current ISYS = 0, MODE = 5V 1.4 mA
Programmable Boost Output
Current Limit Accuracy IOLIM RS1 = 40m, ROLIM = 100k 1 1.2 1.44 A
Programmable Boost Output
Current(5) RS1 = 50m, ROLIM=63.4k 1.5 A
SYS Over-Current Blanking
Time(5) τSYSOCBLK 120 µs
SYS Over-Current Recovery
Time(5) τSYSRECVR 1 ms
Weak-Battery Threshold VBATT(LOW) During Boost mode 2.5 V
Before Boost mode 2.9 3.05 V
Sleep Mode
Battery Leakage Current ILEAKAGE VBATT = 4.2V, SYS Float, VIN
= 0V, MODE = 0V 15 30 A
Indication and Logic
ACOK
----------------
, CHG
------------
, BOOST
-------------------
pin
output low voltage Sinking 1.5mA 400 mV
ACOK
----------------
, CHG
------------
, BOOST
-------------------
pin
leakage current Connected to 5V 1 A
NTC and Time-Out Fault
Blinking Frequency(5) C
TMR=0.1F, ICHG=1A 13.7 Hz
EN Input Logic LOW Voltage 0.4 V
EN Input High Voltage 1.4 V
Mode Input Logic LOW Voltage 0.4 V
Mode Input Logic HIGH Voltage 1.4 V
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER TC (m
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 6
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© 2016 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5.0V, TA = 25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Protection
Trickle-Charge Time CTMR=0.1µF, remains in TC
mode, ICHG= 1A 60 Min
Total Charge Time CTMR=0.1µF, ICHG= 1A 360 Min
NTC Low Temp, Rising
Threshold
RNTC=NCP18XH103(0°C)
65% 66% 67%
VSYS
NTC Low Temp, Rising
Threshold Hysteresis 1%
NTC High Temp, Rising
Threshold
RNTC=NCP18XH103(50°C)
34% 35% 36%
NTC High Temp, Rising
Threshold Hysteresis 1%
Charging Current Fold-back
Threshold(5) Charge Mode 120 °C
Thermal Shutdown Threshold
(5)
150 °C
Notes:
5) Guaranteed by design.
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER charge Currem vs. Input Voltage, Charge Mode V‘N:5V1VBATT7FULL=4.2V‘ VsAn:a N med 5A‘ Temperature:25’c , 5 3 o o ( E z m K m 3 o w a K < i="" o="" temperature="" (we)="" h1200="" 200k="" 3="" 6="" khz="" v1000="" equency="" m="" o="" o="" m="" o="" o="" r‘lim="" (kn)="" rol‘m="" (m)="">
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 7
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© 2016 MPS. All Rights Reserved.
TYPICAL CHARACTERISTICS
CIN=CBATT=CSYS=C3=22µF, C1=C2=1µF, L1=4.7µH, RS1=50m, C4=CTMR=0.1µF, Battery Simulator,
unless otherwise noted.
CHARGE CURRENT (A)
SWITCHING FREQUENCY (kHz)
Charge Current vs.
Temeprature, Charge Mode
V
IN
=5V, V
BATT_FULL
=4.2V,
V
BATT
=3.7V, I
CHG
=1.5A
Switching Frequency vs.
Battery Voltage, Charge Mode
V
IN
=5V, V
BATT_FULL
=4.2V, I
CHG
=2A
BATTERY VOLTAGE (V)
INPUT VOLTAGE (V)
I
CHG
(A)
R
SET
(k)
Charge Current vs.
RISET,Charge Mode
V
IN
=5V, V
BATT_FULL
=4.2V,
V
BATT
=3.7V, F
SW
=1.2MHz
0
0.5
1
1.5
2
0 40 80 120 160
0
0.4
0.8
1.2
1.6
60 80 100 120 140
-3.00
-2.00
-1.00
0.00
1.00
4 4.5 5 5.5 6
0
200
400
600
800
1000
1200
0 0.5 1 1.5 2 2.5
1200k & 4.2V full
1200k & 3.6V full
VOLTAGE (V)
BATTERY VOLTAGE (V)
VCC @ Boost Mode
VOLTAGE (V)
INPUT VOLTAGE (V)
VCC @ Charge Mode
0
1
2
3
4
5
6
7
8
24 6 810
0
1
2
3
4
5
6
7
1357
V
CC
=SYS V
CC
=SYS
Input Current Limit Setting
(Iin_lim vs. RILIM)
INPUT CURRENT LIMIT (A)
0
0.5
1
1.5
2
2.5
3
0 50 100
Programmable Output
Current Limit
(OLIM vs. ROLIM)
BATT=4.2V
SETTING CURRENT (A)
BOOST CURRENT LIMIT (A)
Programmable Output
Current Limit
vs. Battery Voltage
R
OLIM
=73.2k, SYS=5V
BATTERY VOLTAGE (V)
0
0.5
1.0
1.5
2.0
2.5
30 80 130 180 230 280 2.5
3.0
3.5
4.0
4.5
1.2 1.22 1.24 1.26 1.28 1.3
IIII'S’ EFFiCiENCV m) Battery Charge Curve VBATTJULE 42V ’9! ZS/d w TC Charge Steady State VBATLFULL = 41V» VBATT = 2V» st = sookHz Auto Recharge VEArrjuLL = 4 2V Es/dw CC Charge Steady State VEATLFULL = 4 2% VENT: 3 7V st = 500tz q gja MP2633 — 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER Battery Float Steady State VBMUULL : 42v L_. moms/aw CV charge Steady State VBATLFULL = 42V» VBATT = 4-2‘4 PM = sookHz ~— ff ’1') al\/\/\/\/\/\/‘ P7nfl“7”' WW g It a Pif”il”‘ Ips/dw Constant Current Charge Efficiency VENT,FULL = 4.2V, vEm = 0.574.2v, st: SODkHz ws/mv Constant Voltage Charge Efficiency VEAWjuLL = 4 2V‘ VBArr = 4 2V st : snow: Vw=4 5v vw=5v v‘ :5 5v \\ EFFiCiENCV (%) vw=4.5v i fix v‘ :5 av Ips/dw
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 8
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TYPICAL PERFORMANCE CHARACTERISTICS
VIN=5V, CIN=CBATT=CSYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50m, C4=CTMR=0.1µF, Battery
Simulator, unless otherwise noted.
V
IN
1V/div.
V
BATT
1V/div.
CHGOK
2V/div.
I
CHG
1A/div.
V
IN
1V/div.
V
BATT
100mV/div.
CHGOK
2V/div.
I
CHG
1A/div.
V
SW
2V/div.
V
BATT
200mV/div.
CHGOK
5V/div.
I
L
200mA/div.
V
IN
1V/div.
V
SW
2V/div.
V
BATT
2V/div.
I
L
500mA/div.
V
IN
1V/div.
V
SW
2V/div.
V
BATT
2V/div.
I
L
1A/div.
V
IN
1V/div.
V
SW
2V/div.
V
BATT
2V/div.
I
L
1A/div.
BATTERY VOLTAGE (V) CHARGE CURRENT (A)
50
60
70
80
90
100
012345
80
85
90
95
100
0 0.5 1 1.5 2
mp5 MP2633 — 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER \ Ams/mv 100ms/dw. Aoflus/dw. Input Over Voltage Protection vw=5vm12v RSVS LOAD=25Q Banery F‘oal‘ Enab‘ea Charge wmw \\\\\\\\Ix \_ mx Hm a —— l1 —— ADDus/dw Is/dlv 25/le \ F5vy ‘ ‘ VBArr ‘ T ‘ DJ; 1 ' J\ If It“ y ‘ . M— r R F ‘ “ A Liv 40m$ldw 1UUH$MW Asldw
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 9
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, CIN=CBATT=CSYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50m, C4=CTMR=0.1µF, Battery
Simulator, unless otherwise noted.
V
BATT
2V/div.
V
IN
2V/div.
V
SYS
2V/div.
I
L
500mA/div.
V
BATT
2V/div.
V
SYS
2V/div.
V
IN
2V/div.
I
L
500mA/div.
V
BATT
2V/div.
EN
5V/div.
V
SYS
2V/div.
I
L
1A/div.
V
BATT
2V/div.
V
EN
5V/div.
V
SYS
2V/div.
I
L
1A/div.
I
CHG
1A/div.
I
IN
1A/div.
V
SYS
2V/div.
I
SYS
1A/div.
V
BATT
1V/div.
V
IN
1V/div.
V
SYS
1V/div.
I
SYS
2A/div.
V
BATT
1V/div.
V
IN
1V/div.
V
IN
2V/div.
V
SYS
1V/div.
I
SYS
2A/div.
V
BATT
1V/div.
V
SYS
2V/div.
Power On, Charge Mode
VBATT_FULL=4.2V, VBATT=3.7V,
ICHG=1.5A
En Off, Charge Mode
VBATT_FULL=4.2V, VBATT=3.7V,
ICHG=1.5A
System Short Protection
VBATT_FULL=4.2V, VBATT=2V,
FSW=600kHz
System Short Protection
Zoom In
VBATT_FULL=4.2V, VBATT=2V,
FSW=600kHz
Input Current Limit
VBATT_FULL=4.2V, VBATT=3.7V,
ICHG=1.5A
Power Off, Charge Mode
VBATT_FULL=4.2V, VBATT=3.7V,
ICHG=1.5A
En On, Charge Mode
VBATT_FULL=4.2V, VBATT=3.7V,
ICHG=1.5A
I
BATT
500mA/div.
V
IN
1V/div.
V
BATT
2V/div.
I
SYS
500mA/div.
Input Voltage Clamp @ 4.75V
Charge Mode
VIN_regulation=4.75V, VBATT_FULL=4.2V,
VBATT=3.7V, ICHG=1.5A, Increase Isys
4.75V
IIII'S’ Power On, Boost Mode Power Off, Boost Mode MP2633 — 1 5A SINGLE CELL SWITCH MODE BATTERY CHARGER Power On, Boost Mode stsfiET‘W VEATT:3 7V, stsfizT: Vv VEATT:3-7Vv stsfieT V‘ VBATT:3VL Na svs Loan No svs Load RSVSJOAD: 0 u i i Vsm Vsm Maw “ Zvldlv W v ‘ em 1V/mv at sts E _.___,‘ sts” sts w“; 2V/dlv 2V/dlv 2V/m ‘L p \L \l ‘sys . chmA/dlv W ZDDMA/dlv fiflflmA/mv Ams/dw mums/div Ams/dw Power Off, Boost Mode Mode On, Boost Mode Made Off, Boost Mode VsysisET:5V, VBATEBV, VsysisET:5V. vBArr=3JM vsysjgfiw VBATT:3 7v‘ RSY87L0A0:5Q No svs Load No SYS Luau i ‘ fi i ‘ mane w MODEF m. SV/dw ’ 5W1” VaArrm VENT 1V/dw V 2mm v am a wig? "W Zv/dw F / v svs svs zvmw a“ 2V/dlv W ‘svs 'svs SUOmA/dw 't soomA/mv't ZOOms/dw ms/dw. 20msldlv Mode 0n, Boost Mode Mode Off, Boost Mode SYS Output Current Limit, stsisET=5Vv VeATT=3 7Vv stsisET=5Vv VBATT=3 7Vv Boos! Mode RsvsiLOAD:5G RsvsiLoAD:5Q vsvsisg: v, VEATT:3 7v, ‘oLwLSEF‘A i i ‘eaAJT 1 / w MODE m 5V/flw wmw Vam L L 2V/uw.E . g/E/STY E w sts sts L zvmw m mm.” scam/SJ? I ‘svs scum/Sans" SflflmA/dw. 'E Mons/div 25km
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 10
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© 2016 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, CIN=CBATT=CSYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50m, C4=CTMR=0.1µF, Battery
Simulator, unless otherwise noted.
mp5 MP2633 — 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER fiLLL_H “mi a F...— *W fi‘ fi‘ [1‘ n: // MN MW "’“T‘” L \ =1 ‘1 "‘ Mus/aw st/dw Mus/UN i i i 4 .' k +- 400us/mv. 4ODus/dw AOOMS/dw. EFFIC‘ENCV (%) EFFIC‘ENCY ("/n)
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 11
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, CIN=CBATT=CSYS=C3=22µF, C1=C2=1µF, L1=2.2µH, RS1=50m, C4=CTMR=0.1µF, Battery
Simulator, unless otherwise noted.
V
BATT
2V/div.
V
SYS
2V/div.
I
L
1A/div.
V
BATT
2V/div.
V
SYS
2V/div.
I
L
1A/div.
V
BATT
2V/div.
V
SYS
2V/div.
I
L
1A/div.
V
BATT
2V/div.
V
SYS
2V/div.
BOOST
2V/div.
V
BATT
1V/div.
V
SYS
/AC
200mV/div.
I
SYS
500mA/div.
V
BATT
1V/div.
V
SYS
/AC
200mV/div.
I
SYS
500mA/div.
SYS short Entry
Boost Mode
VSYS_SET=5V, VBATT=3.7V
SYS Load Transient,
Boost Mode
VSYS_SET=5V, VBATT=3.7V,
ISYS= 100mA to 1A
SYS Load Transient,
Boost Mode
VSYS_SET=5V, VBATT=3.7V,
ISYS= 500mA to 1A
SYS Short Steady State
Boost Mode
VSYS_SET=5V, VBATT=3.7V
SYS Short Recovery
Boost Mode
VSYS_SET=5V, VBATT=3.7V
SYS Over Voltage Protection,
Boost Mode
VSYS_SET=6.5V, VBATT=3.7V
30
40
50
60
70
80
90
100
0 0.25 0.5 0.75 1 0 0.25 0.5 0.75 1
VBATT=4.2V
VBATT=2.9V
VBATT=3.7V
30
40
50
60
70
80
90
100
SYSTEM CURRENT (A) SYSTEM CURRENT (A)
Efficiency, Boost Mode
VSYS_SET=5V, VSYS=5V,
FSW=1.2MHz
Efficiency, Boost Mode
VSYS_SET=5V, VSYS=5V,
FSW=600kHz
VBATT=4.2V
VBATT=2.9V
VBATT=3.7V
SYSTEM VOLTAGE (V)
SYSTEM CURRENT (A)
Boost Output V-I Curve
BATT=3.7V, SYS=5V
0
1
2
3
4
5
6
0 0.5 1 1.5
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PIN FUNCTIONS
Pin # Name Description
1 FREQ
Connect to GND to program the operating frequency to 600kHz. Leave floating or connect to
HIGH to program the operating frequency to 1.2MHz.
2 VIN Adapter Input. Place a bypass capacitor close to this pin to prevent large input voltage spikes.
3 VCC
Internal Circuit Power Supply. Bypass to GND with a 100nF ceramic capacitor. This pin can
not carry external load higher than 5mA.
4 ILIM
Input Current Set. Connect to GND with an external resistor to program input current limit in
charge mode.
5 PWIN AC Input Detect. Detect the presence of valid input power.
6 TMR
Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set the
oscillator period. Short to GND to disable the Timer function.
7 REG
Input Voltage Feedback for input voltage regulation loop. Connect to tap of an external resistor
divider from VIN to GND to program the input voltage regulation. Once the voltage at REG pin
drops to the inner threshold, the charge current is reduced to maintain the input voltage at the
regulation value.
8 ACOK
----------------
Valid Input Supply Indicator. Logic LOW indicates the presence of a valid power supply.
9 FB System Voltage Feedback.
10 NTC Negative Temperature Coefficient (NTC) Thermistor.
11 ISET Charge Current Set. Connect an external resistor to GND to program the charge current.
12 OLIM
Boost-Output-Current Limit Set. Connect an external resistor to GND to program the system
current in boost mode.
13 AGND Analog Ground
14 VB
Programmable Battery-Full Voltage. Connect to GND for 3.6V. Leave floating or connect to
logic HIGH for 4.2V.
15 BATT Positive Battery Terminal / Battery Charge Current Sense Negative Input.
16 CSP Battery Charge Current Sense, Positive Input.
17 BOOST
-------------------
Boost Mode Indicator. Logic LOW indicates boost mode in operation. This pin becomes an
open drain when the part operates in charge mode or sleep mode.
18 CHG
------------
Charge Completion indicator. Logic LOW indicates charge mode. The pin becomes an open
drain once the charging has completed or is suspended.
19
PGND,
Exposed
Pad
Power Ground. Connect the exposed pad and GND pin to the same ground plane.
20 SW Switch Output Node.
21, 22 SYS System Output. Please make sure the enough bulk capacitors from SYS to GND. Suggest
4.7uF at least.
23 MODE
Mode Select. Logic HIGHboost mode. Logic LOWsleep mode. Active only when ACOK
__________
is
HIGH (input power is not available).
24 EN
Charge Control Input. Logic HIGH enables charging. Logic LOW disables charging. Active only
when ACOK
__________
is low (input power is OK)
MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER l'l'll'j’
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0.8V
1.15V
BATT+
300mV
VCC
PWIN
VIN
SYS FB
A1
A2
Control Logic &
Mode Selection
TMR
SW
VCC
Driver
VBATT
GMI
MIN
GMV
VBATT_Ref
ICHG_Ref
PWM Controller
Current Setting
Mode Control
GMINI
IIN_Ref
GMINV
VREG_Ref
REG
VBATT
MODE
GMT
TRef
TJ
NTC
VSYS SYS
Indication&
Timer
ACOK
CHG
BOOST
EN
PWM Signal
HSMOS
LSMOS
ISET
ILIM
OLIM
FREQ
AGND
BATT
Charge
Pump
ACOK
VB
K1*ICHG
K2*IIN
CSP
Current
Sense
K1*ICHG
Thermal
Shutdown
VBATT
Buffer
Q1 Q2
PGND
Figure 1: Functional Block Diagram in Charge Mode
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0.8V
1.15V
BATT+
300mV
VCC
PWIN
VIN
SYS FB
A1
A2
Control Logic &
Mode Selection
TMR
SW
VCC
Driver
VBATT
GMV
PWM Controller
Current Setting
Mode Control
GMINI
REG
MODE
NTC
Indication&
Timer
ACOK
CHG
BOOST
EN
PWM Signal
HSMOS
LSMOS
ISET
ILIM
OLIM
FREQ
AGND
BATT
Charge
Pump
ACOK
VB
CSP
VBATT
VSYS_Ref
VFB
K3*ISYS
IOLIM_Ref
Integration
To Current
Setting
Thermal
Shutdown
Q1 Q2
PGND
Figure 2: Functional Block Diagram in Boost Mode
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OPERATION FLOW CHART
POR
VCC
<VCC_UVLO
VPWIN_ L<VPWIN<VPWIN _H
&VIN>VBATT+300mV
Yes
No
MODE High?
No
No
Boost Mode
/BOOST Low
Yes
/ACOK is Low, System
Powered By IN
Yes
EN High?
No
Charger Mode
/CHG Low
Yes
Sleep Mode
Figure 3: Mode Selection Flow Chart
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER i $ l I—' T \ l Lg ,14/ J \7/ \/ \/ ¢ # W 3 L \¥
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
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OPERATION FLOW CHART (continued)
Charger Mode
/CHG Low
Charge Mode?
VBATT>VBATT_TC
VBATT>VBATT_FULL
ICHG
<IBF
Battery Full
Charger ff? ,
/CHG is high
C.V.C C.C.C T.C.C
VBATT< VRECH ?
VBATT<VBATT_TC
VBATT_TC<VBATT<VBATT_FULL
VBATT>VBATT_FULL
No
Yes
No
Yes
Yes
No
Yes
Normal Operation
Charge Suspend,
/CHG is high
NTC OK? TJ=150oC?
TJ=120oC?
Thermal
Shutdown, /CHG is
high
Fault Protection
Yes
Charger Recovery,
Return to Normal
Operation
Yes
No
Yes
No
Charge
Termination, /CHG
is high
Yes
NTC Fault?
No
Timer Out ?
No
Reset
Timer?
Yes
No
TJ=120oC?
No
Decrease I
CHG
to
maintain TJ at 120oC
Yes
No
Yes
No
Figure 4: Normal Operation and Fault Protection in Charge Mode
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER , L W , + <77>< \="" +="">
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 17
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OPERATION FLOW CHART (continued)
Normal Operation
Power Path Management
IIN hit the IIN _LIMIT ?
Charge Current
Decrease
ICHG
=0?
SYS Output
Current Increase
No
Yes
No
Yes
VPWIN touch the VREG?
Yes
No
IIN exceeds I
IN(OCP)?
No
IN to SYS MOSFET
turns Off
Yes
TINOCBLK reaches?
No
TINRECVR reaches?
Regulate the I
IN at
IIN(OCP)
Yes
IIN >7A?
No
No
Yes
Yes
Figure 5: Power-Path Management in Charge Mode
mm MP2633 — 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
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OPERATION FLOW CHART (continued)
Boost Mode
/BOOST Low
VBATT >2.9V?
No
Yes
Normal Boost
Operation
Mode High?
No
Yes
VBATT<2.5V?
No
Boost Turns Off
Yes
Normal Boost
Operation
ISYS > IOLIM?
Output current loop
works, VSYS decreases
VSYS < VBATT?
Yes
VSYS < 2V?
Yes
Yes
IL hits the
current limit
No
Boost Shutdown
TSYSRECVR
Reaches?
Down mode
No
TSYSBLK Reaches?
No
No
Yes
No
Yes Yes
Figure 6: Operation Flow Chart in Boost Mode
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
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START UP TIME FLOW IN CHARGE MODE
Condition: EN = 5V, Mode = 0V, /ACOK and /CHG are always pulled up to an external constant 5V
VIN
SS
Force
Charge
Autorechargethreshold
IBF
Comparator
Auto-
recharge
VSYS
ACOK
Band
Gap
0V
0V
VPWIN >0.8V
&
VIN >VBATT+300mV
VSYS >VBATT +50mV
0V
5V
CHG
0V
5V
0A
ICC
10%ICC
Battery
Voltage
VBATT_FULL
150µs
AssumevBATT >VBATT_TC
150µs
0V
5V
Mode
EN
VCC
2.2V
Charge
Current
VCC
followsVIN
0V
400µs 400µs
Figure 7: Input Power Start-Up Time Flow in Charge Mode
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START UP TIME FLOW IN CHARGE MODE
Condition: VIN = 5V, Mode = 0V, /ACOK and /CHG are always pulled up to an external constant 5V.
VIN
SS
Force
Charge
IBF
Comparator
Auto-
recharge
VSYS
ACOK
Band
Gap
0V
0V
0V
5V
CHG
0V
5V
0A
ICC
10%ICC
Battery
Voltage
VBATT_FULL
150µs
AssumevBATT >VBATT_TC
150µs
0V
5V
Mode
EN
VCC
2.2V
Charge
Current
0V
400µs 400µs
150µs
400µs
Figure 8: EN Start-Up Time Flow in Charge Mode
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START UP TIME FLOW IN BOOST MODE
Condition: VIN = 0V, Mode = 5V, /Boost is always pulled up to an external constant 5V.
MODE
Boost
SS
VCC
Band
Gap
VSYS
VBATT
2.2V
BOOST
0V
2.9V
VSYS>VBATT+300mV0V
0V
5V
Down
Mode
2.5V
0V
VCC follows
VBATT
VCC follows VSYS
1.2ms
Figure 9: Battery Power Start-Up Time Flow in Boost Mode
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START UP TIME FLOW IN BOOST MODE
Condition: VIN = 0V, /Boost is always pulled up to an external constant 5V.
MODE
Boost
SS
VCC
Band
Gap
VSYS
VBATT
2.2V
BOOST
2.9V
VSYS >VBATT+300mV
0V
0V
5V
Down
Mode
0V
5V
0V
5V
VCC follows VBATT
VCC follows VSYS
1.2ms
Figure 10: Mode Start-Up Time Flow in Boost Mode
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER Im
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OPERATION
INTRODUCTION
The MP2633 is a highly-integrated, synchronous,
switching charger with bi-directional operation for
a boost function that can step-up the battery
voltage to power the system. Depending on the
VIN value, it operates in one of three modes:
charge mode, boost mode and sleep mode. In
charge mode, the MP2633 supports a precision
Li-ion or Li-polymer charging system for single-
cell applications. In boost mode, MP2633 boosts
the battery voltage to VSYS to power higher-
voltage systems. In sleep mode, the MP2633
stops charging or boosting and operates at a low
current from the input or the battery to reduce
power consumption when the IC isn’t operating.
The MP2633 monitors VIN to allow smooth
transition between different modes of operation.
CHARGE MODE OPERATION
Charge Cycle (Trickle ChargeCC
ChargeCV Charge)
In charge mode, the MP2633 has five control
loops to regulate the input current, input voltage,
charge current, charge voltage, and device
junction temperature. It charges the battery in
three phases: trickle current (TC), constant
current (CC), and constant voltage (CV). While
charging, all four loops are active but only one
determines the IC behavior. Figure 11(a) shows
a typical battery charge profile. The charger stays
in TC charge mode until the battery voltage
reaches a TC-to-CC threshold. Otherwise the
charger enters CC charge mode. When the
battery voltage rises to the CV-mode threshold,
the charger operates in constant voltage mode.
Figure 11 (b) shows a typical charge profile when
the input-current-limit loop dominates during the
CC charge mode, and in this case the charge
current exceeds the input current, resulting in
faster charging than a traditional linear solution
that is well-suited for USB applications.
Auto-Recharge
Once the battery charge cycle completes, the
charger remains off. During this process, the
system load may consume battery power, or the
battery may self discharge. To ensure that the
battery will not go into depletion, a new charge
cycle automatically begins when the battery
Trickle charge
TC>>>CC
Threshold
CC>>>CV
Threshold
CC charge CV charge
ICHG VBAT
Charge Full
Trickle
Charge
Current
Constant
Charge
Current
a) Without input current limit
Trickle charge
TC>>>CC
Threshold
CC>>>CV
Threshold
CC charge CV charge
ICHG
VBAT
Charge Full
Trickle
Charge
Current
Input
Current
Limit
Constant
Charge
Current
b) With input current limit
Figure 11: Typical Battery Charginge Profile
voltage falls below the auto-recharge threshold
and the input power is present. The timer resets
when the auto-recharge cycle begins.
During the off state after the battery is fully
charged, if the input power re-starts or the EN
signal refreshes, the charge cycle will start and
the timer will reset no matter what the battery
voltage is.
Battery Over-Voltage Protection
The MP2633 has battery over-voltage protection.
If the battery voltage exceeds the battery over-
voltage threshold, (103.3% of the battery-full
voltage), charging is disabled. Under this
condition, an internal current source draws a
current from the BATT pin to decrease the
battery voltage and protect the battery.
Timer Operation in Charge Mode
The MP2633 uses an internal timer to terminate
the charging. The timer remains active during the
charging process. An external capacitor between
TMR and GND programs the charge cycle
duration.
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If charging remains in TC mode beyond the
trickle-charge time τTOTAL_TMR, charging will
terminate. The following determines the length of
the trickle-charge period:
TMR
TRICKLE _ TMR
CHG
C(F) 1A
60mins 0.1 F I (A)

(1)
The maximum total charge time is:
TMR
TOTAL _ TMR
CHG
C(F) 1A
6Hours 0.1 F I (A)
 
(2)
Negative Temperature Coefficient (NTC) Input
for Battery Temperature Monitoring
The MP2633 has a built-in NTC resistance
window comparator, which allows the MP2633 to
monitor the battery temperature via the battery-
integrated thermistor. Connect an appropriate
resistor from VSYS to the NTC pin and connect the
thermistor from the NTC pin to GND. The resistor
divider determines the NTC voltage depending
on the battery temperature. If the NTC voltage
falls outside of the NTC window, the MP2633
stops charging. The charger will then restart if the
temperature goes back into NTC window range.
Input-Current Limiting in Charge Mode
The MP2633 has a dedicated pin that programs
the input-current limit. The current at ILIM is a
fraction of the input current; the voltage at ILIM
indicates the average input current of the
switching regulator as determined by the resistor
value between ILIM and GND. As the input
current approaches the programmed input
current limit, charge current is reduced to allow
priority to system power.
Use the following equation to determine the input
current limit threshold,
ILIM
ILIM
40.5(k)
I= (A)
R(k) (3)
Input Over-Current Protection
The MP2633 features input over-current
protection (OCP): when the input current
exceeds 3A, Q2 is controlled linearly to regulate
the current. If the current still exceeds 3A after a
120µs blanking time, Q2 will turn off. A fast off
function turns off Q2 quickly when the input
current exceeds 7A to protect both Q1 and Q2.
Input Voltage Regulation in Charge Mode
In charge mode, if the input power source is not
sufficient to support both the charge current and
system load current, the input voltage will
decrease. As the input voltage approaches the
programmed input voltage regulation value,
charge current is reduced to allow priority of
system power and maintain the input voltage
avoid dropping further.
The input voltage can be regulated by a resistor
divider from VIN pin to REG pin to AGND
according to the following expression:
5R
5R3R
VV REGR_IN
(4)
Where: the VREG is the internal voltage
reference, 1.2V.
Setting the Charge Current
The external sense resistors, RS1 and RISET,
program the battery charge current, ICHG. Select
RISET based on RS1:
CHG
ISET
70(k) 40(mV)
I(A)=
R(k)RS1(m)
(5)
Where: the 40mV is the charge current limit
reference.
Battery Short Protection
The MP2633 has two current limit thresholds. CC
and CV modes have a peak current limit
threshold of 3A, while TC mode has a current
limit threshold of 1.5A. Therefore, the current limit
threshold decreases to 1.5A when the battery
voltage drops below the TC threshold. Moreover,
the switching frequency also decreases when the
BATT voltage drops to 40% of the charge-full
voltage.
Thermal Foldback Function
The MP2633 implements thermal protection to
prevent thermal damage to the IC and the
surrounding components. An internal thermal
sense and feedback loop automatically
decreases the programmed charge current when
the die temperature reaches 120°C. This function
is called the charge-current-thermal foldback. Not
only does this function protect against thermal
damage, it can also set the charge current based
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on requirements rather than worst-case
conditions while ensuring safe operation.
Furthermore, the part includes thermal shutdown
protection where the ceases charging if the
junction temperature rises to 150°C.
Fully Operation Indication
The MP2633 integrates indicators for the
following conditions as shown in Table 2.
Table 2: Indicator for Each Operation Mode
Operation ACOK
----------------
CHG
------------
BOOST
-------------------
Charge Mode
Charging
Low
Low
High
End of Charge, charging disabled High
NTC Fault, Timer Out Blinking
Boost Mode High High Low
Sleep Mode, VCC absent High High High
BOOST MODE OPERATION
Low-Voltage Start-Up
The minimum battery voltage required to start up
the circuit in boost mode is 2.9V. Initially, when
VSYS < VBATT, the MP2633 works in down mode.
In this mode, the synchronous P-MOSFET stops
switching and its gate connects to VBATT statically.
The P_MOSFET keeps off as long as the voltage
across the parasitic CDS (VSW) is lower than VBATT.
When the voltage across CDS exceeds VBATT, the
synchronous P-MOSFET enters a linear mode
allowing the inductor current to decrease and
flowing into the SYS pin. Once VSYS exceeds
VBATT, the P-MOSFET gate is released and
normal closed-loop PWM operation is initiated. In
boost mode, the battery voltage can drop to as
low as 2.5V without affecting circuit operation.
SYS Disconnect and Inrush Limiting
The MP2633 allows for true output disconnect by
eliminating body diode conduction of the internal
P-MOSFET rectifier. VSYS can go to 0V during
shutdown, drawing no current from the input
source. It also allows for inrush current limiting at
start-up, minimizing surge currents from the input
supply. To optimize the benefits of output
disconnect, avoid connecting an external
Schottky diode between the SW and SYS pins.
Board layout is extremely critical to minimize
voltage overshoot at the SW pin due to stray
inductance. Keep the output filter capacitor as
close as possible to the SYS pin and use very
low ESR/ESL ceramic capacitors tied to a good
ground plane.
Boost Output Voltage
In the boost mode, the MP2633 programs the
output voltage via the external resistor divider at
FB pin, and provides built-in output over-voltage
protection (OVP) to protect the device and other
components against damage when VSYS goes
beyond 6V. Should output over-voltage occur,
the MP2633 turns off the boost converter. Once
VSYS drops to a normal level, the boost converter
restarts again as long as the MODE pin remains
in active status.
Boost Output-Current Limiting
The MP2633 integrates a programmable output
current limit function in boost mode. If the boost
output current exceeds this programmable limit
threshold, the output current will be limited at this
level and the SYS voltage will start to drop down.
The OLIM pin programs the current limit
threshold up to 1.5A as per the following
equation:
7.1
)m((1RS
)mV(40
)k(R
)k(70
)A(I
OLIM
OLIM
(6)
Where: the 40mV is the charge current limiting
reference.
SYS Output Over Current Protection
The MP2633 integrates three-phase output over-
current protection.
Phase one (boost mode): when the output
current exceeds the output current limit, the
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output constant current loop controls the output
current, the output current remains at its limit of
IOLIM, and VSYS decreases.
Phase two (down mode): when VSYS drops below
VBATT+100mV and the output current loop
remains in control, the boost converter enters
down mode and shutdown after a 120s blanking
time.
Phase three (short circuit mode): when VSYS
drops below 2V, the boost converter shuts down
immediately once the inductor current hits the
fold-back peak current limit of the low side N-
MOSFET. The boost converter can also recover
automatically after a 1ms deglitch period.
Thermal Shutdown Protection
Thermal shutdown protection is also active in
boost mode. Once the junction temperature rises
higher than 150°C, the MP2633 enters thermal
shutdown. It will not resume normal operation
until the junction temperature drops below 120°C.
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APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Charge Current in Charge Mode
In charge mode, both the external sense resistor,
RS1, and the resistor RISET connect to the ISET
pin to set the charge current (ICHG) of the
MP2633 (see the Typical Application circuit).
Given ICHG and RS1, the regulation threshold,
VIREF, across this resistor is:
)A(I)m(1RS)mV(V CHGIREF (7)
RISET sets VIREF as per the following equation:
)mV(40
)k(R
)k(70
)mV(V
ISET
IREF
(8)
So, the RISET can be calculated as:
)mV(40
)mV(V
)k(70
)k(R
IREF
ISET
(9)
For example, for ICHG=1.5A and RS1=50m:
VIREF=75mV, so RISET=37.4k.
Setting the Input Current Limiting in Charge
Mode
In charge mode, connect a resistor from the ILIM
pin to AGND to program the input current limit.
The relationship between the input current limit
and setting resistor is:
)k(
)A(I
5.40
R
LIM_IN
ILIM (10)
Where RILIM must exceed 20k so that IIN_LIM is
in the range of 0A to 2A.
For most applications, use RILIM = 45k
(IUSB_LIM=900mA) for USB3.0, and use an RLIM =
81k (IUSB_LIM=500mA) for USB2.0.
Setting the Input Voltage Range for Different
Operation Modes
A resistive voltage divider from the input
voltage to PWIN pin determines the
operating mode of MP2633.
)V(
6R4R
6R
VV INPWIN
(11)
If the voltage on PWIN is between 0.8V and
1.15V, the MP2633 works in the charge mode.
While the voltage on the PWIN pin is not in the
range of 0.8V to 1.15V and VIN > 2V, the
MP2633 works in the boost mode (see MPS. All
Rights Reserved.).
For a wide operating range, use a maximum
input voltage of 6V as the upper threshold for a
voltage ratio of:
6R4R
6R
6
15.1
V
V
IN
PWIN
(12)
With the given R6, R4 is then:
6R
V
VV
4R
PWIN
PWININ
(13)
For a typical application, start with R6=5.1k, R4
is 21.5k.
Setting the Input Voltage Regulation in
Charge Mode
In charge mode, connect a resistor divider from the
VIN pin to AGND with tapped to REG pin to program
the input voltage regulation.
5R
5R3R
VV REGR_IN
(14)
With the given R5, R3 is:
5R
V
VV
3R
REG
RGER_IN
(15)
For a preset input voltage regulation value, say
4.75V, start with R5=5.1k, R3 is 15k.
NTC Function in Charge Mode
Figure 12 shows that an internal resistor divider
sets the low temperature threshold (VTL) and high
temperature threshold (VTH) at 65%·VSYS and
35%·VSYS, respectively. For a given NTC
thermistor, select an appropriate RT1 and RT2 to
set the NTC window.
%65TL
//RRR
//RR
V
V
NTC_ColdT2T1
NTC_ColdT2
SYS
TL
(16)
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%35TH
//RRR
//RR
V
V
NTC_HotT2T1
NTC_HotT2
SYS
TH
(17)
Where RNTC_Hot is the value of the NTC resistor at
the upper bound of its operating temperature
range, and RNTC_Cold is its lower bound.
The two resistors, RT1 and RT2, independently
determine the upper and lower temperature limits.
This flexibility allows the MP2633 to operate with
most of NTC resistors for different temperature
range requirements. Calculate RT1 and RT2 as
follows:
)RR(TLTH
)THTL(RR
R
NTC_HotNTC_Cold
NTC_ColdNTC_Hot
T1
(18)
NTC_HotNTC_Cold
NTC_HotNTC_Cold
T2 RTLTH)-(1-RTH)TL1(
RR)THTL(
R
(19)
For example, the NCP18XH103 thermistor has
the following electrical characteristic:
At 0°C, RNTC_Cold = 27.445k;
At 50°C, RNTC_Hot = 4.1601k.
Based on equation (18) and equation (19),
RT1=6.47k and RT2 = 21.35k are suitable for
an NTC window between 0°C and 50°C. Chose
approximate values: e.g., RT1=6.49k and
RT2=21.5k.
If no external NTC is available, connect RT1 and
RT2 to keep the voltage on the NTC pin within the
valid NTC window: e.g., RT1 = RT2 = 10k.
NTC
SYS
Low Temp Threshold
High Temp Threshold
RNTC
RT1
RT2
VTL
VTH
Figure 12: NTC Function Block
Setting the System Voltage in Boost Mode
In the boost mode, the system voltage can be
regulated to the value customer required
between 4.2V to 6V by the resistor divider at FB
pin as R1 and R2 in the typical application circuit.
2R
2R1R
V2.1VSYS
(20)
Where 1.2V is the voltage reference of SYS. With
a typical value for R2, 10k, R1 can be
determined by:
)V(
V2.1
V2.1V
2R1R SYS
(21)
For example, for a 5V system voltage, R2 is
10k, and R1 is 31.6k.
Setting the Output Current Limit in Boost
Mode
In boost mode, connect a resistor from the OLIM
pin to AGND to program the output current limit.
The relationship between the output current limit
and setting resistor is as follows:
7.1
)m(1RS)A(I
)mV(40)k(70
)k(R
OLIM
OLIM
(22)
Where ROLIM is greater than 63.4k, so IOLIM can
be programmed up to 1.5A.
Selecting the Inductor
Inductor selection trades off between cost, size,
and efficiency. A lower inductance value
corresponds with smaller size, but results in
higher ripple currents, higher magnetic hysteretic
losses, and higher output capacitances. However,
a higher inductance value benefits from lower
ripple current and smaller output filter capacitors,
but results in higher inductor DC resistance (DCR)
loss.
Choose an inductor that does not saturate under
the worst-case load condition.
1. Charge Mode
When MP2633 works in charge mode (as a
buck converter), estimate the required
inductance as:
SIN
BATT
MAX_L
BATTIN
fV
V
I
VV
L
(23)
Where VIN, VBATT, and fS are the typical input
mp: MP2633 — 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
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voltage, the CC charge threshold, and the
switching frequency, respectively. IL_MAX is
the maximum inductor ripple current, which is
usually designed at 30% of the CC charge
current.
With a typical 5V input voltage, 30% inductor
current ripple at the corner point between
trickle charge and CC charge (VBATT=3V), the
inductance is 1.85H (for a 1.2MHz switching
frequency), and 3.7µH (for a 600kHz
switching frequency).
2. Boost Mode
When the MP2633 is in boost mode (as a
boost converter), the required inductance
value is calculated as:
MAX_LSSYS
BATTSYSBATT
IfV
)VV(V
L
(24)
)MAX(BATTMAX_L I%)40%30(I (25)
BATT
SYSSYS
)MAX(BATT V
IV
I (26)
Where VBATT is the minimum battery voltage,
fSW is the switching frequency, and IL_MAX is
the peak-to-peak inductor ripple current,
which is approximately 30% of the maximum
battery current, IBATT(MAX). ISYS(MAX) is the
system current and is the efficiency.
In the worst case where the battery voltage is
3V, a 30% inductor current ripple, and a
typical system voltage (VSYS=5V), the
inductance is 1.8H (for the 1.2MHz
switching frequency) and 3.6µH (for the
600kHz switching frequency) when the
efficiency is 90%.
For best results, use an inductor with an
inductance of 1.8H (for the 1.2MHz
switching frequency) and 3.6µH (for the
600kHz switching frequency) with a DC
current rating that is at least 30% higher than
the maximum charge current for applications.
For higher efficiency, minimize the inductor’s
DC resistance.
Selecting the Input Capacitor, CIN
The input capacitor CIN reduces both the surge
current drawn from the input and the switching
noise from the device. The input capacitor
impedance at the switching frequency should be
less than the input source impedance to prevent
high-frequency-switching current from passing to
the input. For best results, use ceramic
capacitors with X5R or X7R dielectrics because
of their low ESR and small temperature
coefficients. For most applications, a 22µF
capacitor will suffice.
Selecting the System Capacitor, CSYS
Select CSYS based on the demand of the system
current ripple.
1. Charge Mode
The capacitor CSYS acts as the input capacitor of
the buck converter in charge mode. The input
current ripple is:
MAX_IN
TCMAX_INTC
MAX_SYSMAX_RMS V
)VV(V
II
(27)
2. Boost Mode
The capacitor, CSYS, is the output capacitor of
boost converter. CSYS keeps the system voltage
ripple small and ensures feedback loop stability.
The system current ripple is given by:
MAX_SYS
TCMAX_SYSTC
MAX_SYSMAX_RMS V
)VV(V
II
(28)
Since the input voltage passes to the system
directly, VIN_MAX=VSYS_MAX, both charge mode and
boost mode have the same system current ripple.
For ICC_MAX=2A, VTC=3V, VIN_MAX=6V, the
maximum ripple current is 1A. Select the system
capacitors base on the ripple-current temperature
rise not exceeding 10°C. For best results, use
ceramic capacitors with X5R or X7R dielectrics
with low ESR and small temperature coefficients.
For most applications, use a 22µF capacitor.
Selecting the Battery Capacitor, CBATT
CBATT is in parallel with the battery to absorb the
high-frequency switching ripple current.
1. Charge Mode
The capacitor CBATT is the output capacitor of the
buck converter. The output voltage ripple is then:
mp5 MP2633 — 1.5A SINGLE CELL SWITCH MODE BATI'ERY CHARGER
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LfC8
V/V1
V
V
r2
SBATT
SYSBATT
BATT
BATT
BATT
(29)
2. Boost Mode
The capacitor CBATT is the input capacitor of
the boost converter. The input voltage ripple
is the same as the output voltage ripple from
equation (29).
Both charge mode and boost mode have the
same battery voltage ripple. The capacitor CBATT
can be calculated as:
Lfr8
V/V1
C2
SMAX_BATT
MAX_SYSTC
BATT
(30)
To guarantee the ±0.5% BATT voltage accuracy,
the maximum BATT voltage ripple must not
exceed 0.5% (e.g., 0.1%). The worst case occurs
at the minimum battery voltage of the CC charge
with the maximum input voltage.
For VSYS_MAX=6V, VCC_MIN=VTC=3V, L=3.9µH,
fS=600kHz or 1.2MHz, %1.0r MAX_BATT , CBATT is
22µF (for a 600kHz switching frequency) or 10µF
(for a 1.2MHz switching frequency).
A 22µF ceramic with X5R or X7R dielectrics
capacitor in parallel with a 220uF electrolytic
capacitor will suffice.
PCB LAYOUT GUIDE
PCB layout is very important to meet specified
noise, efficiency and stability requirements. The
following design considerations can improve
circuit performance:
1) Route the power stage adjacent to their
grounds. Aim to minimize the high-side switching
node (SW, inductor) trace lengths in the high-
current paths and the current sense resistor trace.
Keep the switching node short and away from all
small control signals, especially the feedback
network.
Place the input capacitor as close as possible to
the VIN and PGND pins. The local power input
capacitors, connected from the SYS to PGND,
must be placed as close as possible to the IC.
Place the output inductor close to the IC and
connect the output capacitor between the
inductor and PGND of the IC.
2) For high-current applications, the power pads
for IN, SYS, SW, BATT and PGND should be
connected to as many copper planes on the
board as possible. The exposed pad should
connect to as many GND copper planes in the
board as possible. This improves thermal
performance because the board conducts heat
away from the IC.
3) The PCB should have a ground plane
connected directly to the return of all components
through vias (e.g., two vias per capacitor for
power-stage capacitors, one via per capacitor for
small-signal components). If possible, add vias
inside the exposed pads for the IC. A star ground
design approach is typically used to keep circuit
block currents isolated (power-signal/control-
signal), which reduces noise-coupling and
ground-bounce issues. A single ground plane for
this design gives good results.
4) Place ISET, OLIM and ILIM resistors very
close to their respective IC pins.
Top Layer
Bottom Layer
Figure 13: PCB Layout Guide
mp: MP2633 — 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER VOUT sw
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DESIGN EXAMPLE
Below is a design example following the
application guidelines for the specifications:
Table 3: Design Example
VIN 5V
VOUT 3.7V
fS
1200kHz
Figure14 shows the detailed application
schematic. The Typical Performance
Characteristics section shows the typical
performance and circuit waveforms. For more
possible applications of this device, please refer
to the related Evaluation Board datasheets.
l'l'll'j’ =C§ RL an 22» c nu ma? w 51k 215k a: m c2 21% on u u mr 15k vcc M mm. 2: MP2533 MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER am
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
MP2633 Rev. 1.08 www.MonolithicPower.com 32
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TYPICAL APPLICATION CIRCUITS
Figure14: Detailed Application Circuit
mp: MP2633 —1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER 2.80 1 I 4 J U UgU U L D ! L1 | {.3 ______ E- I 4.10 3 C zsn - A i a T3 i E 5 Lan nfn n n TOP VIEW I BOTTOM VIEW w m NOTE: ! I w 1 I] ma DE 1m , |—_r| I :5 5 :5 _g_ _____ 4 ...... ET Eb ; til RECOMMEN DED LAND PATTERN
MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP2633 Rev. 1.08 www.MonolithicPower.com 33
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PACKAGE INFORMATION
QFN24 (4x4mm)
SIDE VIEW
TOP VIEW
1
2419
18
13
12 7
6
BOTTOM VIEW
3.90
4.10
2.50
2.80
3.90
4.10
2.50
2.80
0.50
BSC
0.18
0.30
0.80
1.00
0.00
0.05
0.20 REF
PIN 1 ID
MARKING
2.70
0.25
RECOMMENDED LAND PATTERN
3.90 NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) DRAWING CONFIRMS TO JEDEC MO-220, VARIATION VGGD.
5) DRAWING IS NOT TO SCALE.
PIN 1 ID
SEE DETAIL A
PIN 1 ID OPTION A
0.30x45º TYP.
PIN 1 ID OPTION B
R0.25 TYP.
DETAIL A
PIN 1 ID
INDEX AREA
0.70
0.35
0.45
0.50