The LM5164-Q1 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-Q1 operates during input voltage dips as low as 6 V, at nearly 100%
duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications and MHEV/EV
systems.With integrated high-side and low-side power MOSFETs, the LM5164-Q1 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. Additional features of the LM5164-Q1 include ultra-low
IQ and diode emulation mode operation for high light-load efficiency,
innovative peak and valley overcurrent protection, integrated VCC 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-Q1 is qualified to automotive AEC-Q100 grade 1 and is
available in a 8-pin SO PowerPAD™ package. Its
1.27-mm pin pitch provides adequate spacing for high-voltage applications.
