SC724,25 Datasheet by Semtech Corporation

'1 SEMTECH
© 2014 Semtech Corporation
POWER MANAGEMENT
1
SC724/SC725
2A Low Vin, Very Low Ron
Load Switch
Features
Input Voltage Range – 1.1V to 3.6V
2A Continuous Output Current
Ultra-Low Ron – 36mΩ
Automatic Output Discharge Circuit
Fast Turn-on Option With No Output Discharge
Circuit – SC724
Extended Soft Start Option With Automatic Out-
put Discharge Circuit – SC725
Low Quiescent Current – 0.81µA(Typ.)
Low Shutdown Current < 1µA – SC724
1.1V Logic Level Enable Compatible With CMOS/GPIO
Control
Hardened ESD Protection 3kV
Package: CSP – 0.76mm × 0.76mm, 0.4mm Pitch
Applications
Smart Phones
Tablet PCs
GPS Devices
Battery Powered Equipment
Other Portable Device
Description
The SC724/SC725 is a low input voltage, very low Ron
load switch designed for use in battery powered applica-
tions. Very low quiescent current of less than 2µA, and a
low shutdown current of less than 1µA (SC724) reduces
power loss during Standby and Off states. A logic level
Enable allows low voltage on/off control down to 1.1V.
The SC724 provides a quick turn on time, while the SC725
provides a longer soft start to limit inrush current. The
SC725 also features an automatic discharge circuit which
discharges the output when the part is disabled.
The SC724/SC725 is offered in an ultra-small 4-bump
0.76mm × 0.76mm Chip Scale Package (CSP) which
enables very small board area implementations. The
SC724/SC725 has an operating ambient temperature
range of -40°C to +85°C.
SC724/SC725 offers an alternative bump connection
pattern to SC724/SC725. Please go to Semtech.com
website for details.
SC724 / SC725
SUPPLY LOAD
VOUTVIN
EN GND
ENABLE
VIN
1µF 1µF
Typical Application Circuit
Rev. 2.0
Device Package Automatic
Discharge Rising Time
SC724 CSP No 3µs(Typ.)
SC725 CSP Yes 140µs(Typ.)
7‘ '1 SEMTECH
SC724/SC725
2
Pin Configuration Ordering Information
Device Package
SC724CSTRT CSP 0.76mm×0.76mm 4-bump
SC725CSTRT CSP 0.76mm×0.76mm 4-bump
SC724EVB Evaluation Board
SC725EVB Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 5,000 devices.
(2) Lead-free packaging only. Device is WEEE and RoHS compliant,
and halogen free.
A 1 A 2
B 1 B 2
TO P V IEW
(B U M PS O N T H E B O T T OM )
CSP 0.76x0.76, 4 Bump
Pin Descriptions
Pin # Pin
Name Pin Function
A1 VIN Input Voltage.
B1 EN Enable input. A 5.0MΩ internal resistor is connected from this pin to GND. Drive HIGH to turn on the switch;
drive LOW to turn off the switch. When the EN pin is floated, the switch is OFF.
A2 VOUT Output Voltage.
B2 GND Ground.
7‘ '1 SEMTECH
SC724/SC725
3
Marking Information(SC724) Marking Information(SC725)
Marking for the 0.76 x 0.76 mm CSP 4 Lead Package :
O = Pin 1 ID
nn = Part No. Code (Example: AR) - Reference Part No.
Marking for the 0.76 x 0.76 mm CSP 4 Lead Package :
O = Pin 1 ID
nn = Part No. Code (Example: AT) - Reference Part No.
7‘ '1 SEMTECH
SC724/SC725
4
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters
specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JS-001-2012.
(2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Absolute Maximum Ratings
VIN to GND (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +4.3
EN to GND (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +4.3
OUT to GND (V) . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3 to +VVIN
ESD Protection Level(1) (kV) ............................ 3
Recommended Operating Conditions
Ambient Temperature Range (°C) . . . . . . . . . -40 < TA < +85
VVIN (V) ........................................1.1 to 3.6
Maximum Output Current (A) . . . . . . . . . . . . . . . . . . . . . . . . 2
Thermal Information
Thermal Resistance, Junction to Ambient(2) (°C/W) . . .
160
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +125
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Unless noted otherwise, TA = 25°C for typical, -40°C < TA = TJ < 85°C for min and max. VVIN = 1.8V, CIN = 1μF, COUT = 1μF, VEN = VVIN.
Parameter Symbol Conditions Min Typ Max Units
On Resistance (Ron) RON
VVIN =3.6V, IOUT = 200mA, VVEN =1.5V 24 mΩ
VVIN =2.5V, IOUT = 200mA, VVEN =1.5V 29 mΩ
VVIN =1.8V, IOUT = 200mA, VVEN =1.5V 36 47 mΩ
VVIN =1.5V, IOUT = 200mA, VVEN =1.5V 43 mΩ
VVIN =1.2V, IOUT = 200mA, VVEN =1.0V 57 mΩ
Quiescent Current (1) IQVVIN = VEN = 3.6V, VOUT = open 0.81 2 µA
Enable
EN Input High Threshold VEN-IH 1.1 V
EN Input Low Threshold VEN-IL 0.3 V
EN Input Pull-Down Resistance REN 5.0 MΩ
SC724
Shutdown Current ISD
VEN =0V, VOUT = open 1 µA
VEN =0V, VOUT = open, TA = 25°C°C 0.2 µA
Electrical Characteristics
7‘ '1 SEMTECH Turnran Laura!
SC724/SC725
5
Parameter Symbol Conditions Min Typ Max Units
Turn-on Delay Time TDT
VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 11 µs
VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 2.8 µs
Rising Time TRT
VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 8.5 µs
VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 3 µs
SC725
Shutdown Current ISD
VEN =0V, VOUT = open 8 µA
VEN =0V, VOUT = open, TA = 25°C°C 0.6 µA
Turn-on Delay Time TDT
VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 240 µs
VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 110 µs
Rising Time TRT
VVIN =1.8V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 250 µs
VVIN =3.6V, IOUT = 200mA, VVEN =1.5V, COUT=1µF 140 µs
Output Pull-Down Resistance RPD VVIN =1.8V 220 Ω
Electrical Characteristics (continued)
Notes:
(1) IQ current includes EN pull-down current.
Turn-on
Delay
Rising
Time
Turn-off
Delay
90%
10%
VEN
VOUT
Falling
Time
(Turn on time)=(Turn-on Delay)+(Rising Time)
Timing Diagram
V. '1 SEMTECH umq nu ”ii-in i .svin, 0A Time (Ems/div) imau 7* / / J 3.5Vin, 180 Time (iops/ iv) ucrnq I r T... Time (ZOps/ iv) ha. 3.6Vin in Time (Sms/diV) um iiii iii 4i / A / k. Time [mus/div)
SC724/SC725
6
Time (5ms/div)
Start Up by VIN
Start Up by EN Start Up by EN
1.8Vin, 0A
Typical Characteristics (SC724)
VOUT
1V/div.
VIN
1V/div.
IOUT
1A/div.
3.6Vin,0A
Time (10µs/div)
Testing condition: VIN=3.6V,
Iout=0.5A, C2=1uF, 25Ԩ,
VOUT
VIN
Iin
Start up by VIN
IOUT
3.6Vin,1.8Ω
EN
2V/div. Time (10µs/div)
Time (5ms/div)
Shut Down by VIN
3.6Vin,1.8Ω
StartupbyEN
Testingcondition:VIN=1.8V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
Testingcondition:VIN=3.6V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
Testingcondition:VIN=1.8V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
Testingcondition:VIN=3.6V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
VOUT
VIN
EN
IIN
VOUT
VIN
EN
IIN
VOUT
VIN
EN
IIN
VOUT
VIN
EN
IIN
StartupbyEN
Testingcondition:VIN=1.8V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
Testingcondition:VIN=3.6V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
Testingcondition:VIN=1.8V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
Testingcondition:VIN=3.6V,25Ԩ,
Iout=2A,C1=C2=1uF,CRMode
VOUT
VIN
EN
IIN
VOUT
VIN
EN
IIN
VOUT
VIN
EN
IIN
VOUT
VIN
EN
IIN
VIN
1V/div.
IIN
1A/div.
VOUT
1V/div.
EN
2V/div.
Time (20µs/div)
Shut Down by EN
3.6Vin, 18Ω
IIN
1A/div.
Testing condition: VIN=3.6V,
Iout=0.5A, C2=1uF, CR mode, 25ɗ
T6(Vout)
T5(Vin)
Iout
Shutdown by VIN
VOUT
VIN
Iin
IOUT
VOUT
1V/div.
VIN
1V/div.
IOUT
1A/div.
IIN
1A/div.
VOUT
0.5V/div.
VIN
0.5V/div.
IIN
1A/div.
EN
2V/div.
VOUT
1V/div.
VIN
1V/div.
IOUT
0.2A/div.
so 70 50 K] / to : .xv / 3a // 71] IO 40 25 3|] 7|] 5|] 10 $16 {A12 one
SC724/SC725
7
Typical Characteristics (SC724), Cont.
Quiescent Current (µA)
.8V
On Resistance (mΩ)
Temperature (°C)
On Resistance vs. Temperature
Quiescent Current vs. Temperature
Iout=200mA
.8
On Resistance (mΩ)
Temperature (°C)
On Resistance vs. Temperature
Iout=2A
Temperature (°C)
Turn-on delay time (µs)
Turn-on Delay Time vs. Temperature
Turn-on delay time
ı
IJı
ijı
Ĵı
ĵı
Ķı
ķı
Įĵı ijĶ ĹĶ
ŕŶųůĮŐůġŅŦŭŢźġŕŪŮŦĩŶŔĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
3.6V
1.8V
1.1V
Temperature (°C)
Shut Down Current (µA)
Shut Down Current vs. Temperature
Shutdown Current
ıįıı
ıįıĵ
ıįıĹ
ıįIJij
ıįIJķ
ıįijı
ıįijĵ
ıįijĹ
ıįĴij
Įĵı ijĶ ĹĶ
ŔũŶŵťŰŸůġńŶųųŦůŵĩŶłĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
3.6V
1.8V
1.1V
Temperature (°C)
7. '1 SEMTECH 3.6Vin,‘ .30 mcrnq i——-\ \ \\ "" \ \ \ Time (Ems/div) Time (Ems/div) 1.8Vin 0.90 3.6vi 1.80 mg llama : /I Time [0.1ms/div) Time (OTst/div) 3.5Vin, I so warm; Ime( uS/d v)
SC724/SC725
8
Time (5ms/div)
Start Up by VIN
Start Up by EN Start Up by EN
1.8Vin, 0.9Ω
Typical Characteristics (SC725)
VOUT
1V/div.
VIN
1V/div.
IOUT
1A/div.
3.6Vin,1.8Ω
Time (0.2ms/div)
3.6Vin,1.8Ω
EN
2V/div. Time (0.1ms/div)
Time (5ms/div)
Shut Down by VIN
3.6Vin,1.8Ω
VIN
1V/div.
IOUT
1A/div.
VOUT
1V/div.
EN
2V/div.
Time (5µs/div)
Shut Down by EN
3.6Vin, 18Ω
VOUT
1V/div.
VIN
1V/div.
VOUT
0.5V/div.
VIN
0.5V/div.
IOUT
1A/div.
IOUT
0.2A/div.
VOUT
1V/div.
VIN
1V/div.
EN
2V/div.
IIN
1A/div.
IOUT
1A/div.
IIN
1A/div.
Ķıı
ĶĶı
ķıı
ķĶı
ĸıı
ĸĶı
Ĺıı
ĹĶı
ĺıı
ĺĶı
IJııı
Įĵı ijĶ ĹĶ
œŰůĩŮȟĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
3.6V
1.8V
1.1V
EN High Threshold
(mV)
Temperature (°C)
EN High Threshold vs. Temperature
7. '1 SEMTECH 20 15 L0 05 x w / 3511 2511 [i] [01] 350 150 1m
SC724/SC725
9
Typical Characteristics (SC725), Cont.
Turn On Delay (µs)
ıįı
ıįĶ
IJįı
IJįĶ
ijįı
ijįĶ
Įĵı ijĶ ĹĶ
ŔũŶŵťŰŸůġńŶųųŦůŵĩŶłĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
3.6V
1.8V
1.1V
Shut Down Current (µA)
Temperature (°C)
Shut Down Current vs. Temperature
Turn-on Delay vs. Temperature
Turn Off Delay (µs)
Turn-off Delay vs. Temperature
ı
Ķı
IJıı
IJĶı
ijıı
ijĶı
Ĵıı
ĴĶı
Įĵı ijĶ ĹĶ
ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
1
.8
V
3.6V
Temperature (°C)
ı
ij
ĵ
ķ
Ĺ
IJı
IJij
IJĵ
IJķ
IJĹ
Įĵı ijĶ ĹĶ
ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
1
.8V
3.6V
Temperature (°C)
Rising Time (µs)
Rising Time vs. Temperature
Falling Time (µs)
Falling Time vs. Temperature
ı
Ķı
IJıı
IJĶı
ijıı
ijĶı
Ĵıı
ĴĶı
Įĵı ijĶ ĹĶ
ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
1.8V
3.6V
Temperature (°C)
ı
IJ
ij
Ĵ
ĵ
Ķ
ķ
ĸ
Ĺ
Įĵı ijĶ ĹĶ
ņŏġőŶŭŭťŰŸůġœŦŴŪŴŵŢůŤŦĩŎȟĪ
ŕŦŮűŦųŢŵŶųŦĩɗĪ
1.8V
3.6V
Temperature (°C)
7‘ '1 SEMTECH VIN
SC724/SC725
10
Block Diagram
VIN (1.1V to 3.6V) VOUT
EN
GND
C1
C2
SC724
ILoad
(Up to 2A)
Slew Rate
Control
VIN (1.1V to 3.6V) VOUT
EN
GND
C1
C2
Slew Rate
Control
SC725
ILoad
(Up to 2A)
SC724
SC725
7‘ '1 SEMTECH
SC724/SC725
11
Output Capacitor
A 1µF ceramic capacitor is normally used at the VOUT pin
to suppress output noise and provide smooth voltage to
the load. If a larger output capacitance value is used, the
input inrush current should be considered because the
power-on transient is also dependent on the output
capacitor value. Note that SC725 has longer Turn-on Delay
Time and Rising Time than SC724. If a larger output
capacitor is used, SC725 could significantly improve input
inrush current during power-on process.
Board Layout Considerations
Fig. 1 shows a typical application circuit with PCB induc-
tance on the circuit board. An important objective of the
layout is to minimize the PCB inductance by reducing the
length and increasing the width of the traces. The input
capacitor C1 and output capacitor C2 need to be placed
close to the SC724/SC725. To analyze the stray inductance,
Fig. 1 shows three current loops during the opening or
closing of the load switch. The magnitude of the voltage
ringing at VIN or VOUT pin is related to the PCB stray
inductance and the placement of the capacitors. It is
important to keep the voltage ringing below the maximum
voltage rating of the SC724/SC725.
Application Information
Operation
The SC724/SC725 is an integrated high-side PMOS load
switch that is designed to support up to 2A continuous
output current and operate from an input voltage from
1.1V to 3.6V. The internal PMOS pass element has a very
low ON resistance of 36mΩ (typical) at VIN = 1.8V. The
SC724/SC725 also provides ultra-low shutdown and qui-
escent current for extended battery life during applica-
tion off and standby states.
SC725 provides longer Turn-on Delay Time and Rising
Time, which can help reduce inrush current and voltage
drop on the input supply rail during power on.
SC724 provides shorter Turn-on Delay and Rising Time for
applications where immediate response is required.
Output Voltage Pull-down
The SC725 also includes an automatic output discharge
function. It employs a 220Ω (typical) discharge path to
ground when the EN pin is disabled.
Enable
The EN pin controls the ON/OFF states of the load switch.
Pulling the EN pin HIGH turns on the load switch. Pulling
the EN pin LOW turns off the load switch. The EN pin
incorporates a 5.0MΩ (typical) pull-down resistor, so that
when the EN pin is floating the SC724/SC275 is disabled.
Input Capacitor
In order to reduce the effects of voltage drop, noise, and
bounce at the VIN pin, a filter/decoupling capacitor
between VIN to GND is recommended. A 1µF ceramic
capacitor is sufficient for most application conditions.
However, it should be noted that suppressing bounce at
input loop after EN is changed from HIGH to LOW can
require greater capacitor values depending on particular
designs. During certain shutdown conditions, as in the
case when input power supply is abruptly removed, the
input voltage may tend to drop faster than the output
voltage. In this event a reverse current, through the body
diode of internal PMOS FET, from VOUT to VIN can occur.
To limit this reverse current, the Cin value should be
selected greater than the Cout value.
C1 C2
L
PCB
VIN VOUT
L
PCB
GND
L
PCB
L
PCB
I
SW
1uF
I
OUT
R
L
1uF
L
PCB
I
IN
+
-
SC724/SC725
Figure 1 - PCB Circuit with Equivalent Parasitic
Inductance
Evaluation Board Information
The Top Layer and Bottom Layer of a standard evaluation
board are shown in Fig. 2 and Fig. 3, respectively.
Both T1 and T2 test points are Kelvin connections which
can be used to minimize the measurement error of RON.
To enable the part, a jumper can be used between VIN
and EN on J1. To disable the part, a jumper can be con-
nected between EN and GND on J1.
7. '1 SEMTECH 5 SEMTECH SC704EVB I SC724EVBI SC705EVB I SC725EVB I DH vm M o VDUT EN :4 {@115 END 1—” 3 END . sun 5-7mm END 2 S Http:IINHK.SEHTEDH.EDH nEv_4 Dctohar 201: Far Sentech Custnmers nnly o o o o
SC724/SC725
12
Top Layer
DBN461!W!21/6!;!Xfe!Kbo!26!27;69;44!3125!.!)Voujumfe*
Bottom Layer
DBN461!W!21/6!;!Uiv!Kbo!27!21;68;69!3125!.!)Voujumfe*
Figure 2
Figure 3
SEMTECH f 0.76:0.05 // 01610.05 INDEX AREA / V A1 CORNER // 0.10 C 0.66 Max. LJHLJ i+ 0 20:0 03 SEATING ‘77 0.20 NOTES: 1. CONTROLLING DIMENS‘ONS ARE IN MILLIMETERS
SC724/SC725
13
Outline Drawing — CSP 0.76mm X 0.76mm, 4 Lead
'1 SEMTECH 0.40 0.20» e + + 020 I 7 + 777 0.40 I \ \ 4X 60.230 NOTES: I CONTROLLING DIMENSIONS ARE IN MILLIMETERS 2 THIS LAND PAWERN IS FOR REFERENCE PURPOSES ONLV CONSULT VOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET
SC724/SC725
14
Land Pattern — CSP 0.76mm X 0.76mm, 4 Lead
7‘ '1 SEMTECH
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805) 498-2111 Fax: (805) 498-3804
www.semtech.com
Contact Information
SC724/SC725
15
© Semtech 2014
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