The DRV8350R and DRV8353R have an integrated buck regulator (LM5008A) to supply power for an external controller or system voltage rail.
The LM5008A regulator is an easy-to-use buck (step-down) DC-DC regulator that operates from 6-V to 95-V supply voltage. The device is intended for step-down conversions from 12-V, 24-V, and 48-V unregulated, semi-regulated and fully-regulated supply rails. With integrated buck power MOSFET, the LM5008A delivers up to 350-mA DC load current with exceptional efficiency and low input quiescent current in a very small solution size.
Designed for simple implementation, an almost fixed-frequency, constant on-time (COT) operation with discontinuous conduction mode (DCM) at light loads is ideal for low-noise, high current, fast transient load requirements. Control loop compensation is not required reducing design time and external component count.
The LM5008A incorporates other features for comprehensive system requirements, including VCC undervoltage lockout (UVLO), gate drive undervoltage lockout, maximum duty cycle limiter, intelligent current limit off-timer, a precharge switch, and thermal shutdown with automatic recovery. These features enable a flexible and easy-to-use platform for a wide range of applications. The pin arrangement is designed for simple and optimized PCB layout, requiring only a few external components.
For additional details and design information refer to the LM5008A 100-V 350-mA Constant On-Time Buck Switching Regulator data sheet.