LM5164 Synchronous Buck DC/DC Converter

Texas Instruments' LM5164 synchronous buck converter is designed to regulate over a wide input voltage range minimizing the need for external surge suppression components. A minimum controllable on-time of 50 ns facilitates large step-down conversion ratios enabling the direct step-down from a 48 V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5164 operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for wide input supply range industrial and high cell count battery pack applications.

With integrated high-side and low-side power MOSFETs, the LM5164 delivers up to 1 A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. The LM5164 device features ultra-low I_Q and diode emulation mode operation for high light-load efficiency, innovative peak and valley overcurrent protection, integrated V_CC bias supply and bootstrap diode, precision enable and input UVLO, and thermal shutdown protection with automatic recovery. An open-drain PGOOD indicator provides sequencing, fault reporting, and output voltage monitoring.

The LM5164 is available in a thermally-enhanced, 8-pin SO PowerPAD™ package. The 1.27 mm pin-pitch provides adequate spacing for high-voltage applications.