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SD45237
STEP-DOWN DC/DC CONTROLLER WITH ADJUSTABLE CURRENT LIMIT FOR AUTOMOTIVE APPLICATIONS

The SD45237 is a step-down DC-DC controller with adjustable current limit in MSOP-10 package, is intended for driving external N-channel MOSFET in step-down converter applications. This device includes an error amplifier, oscillator, current comparator, slope compensation, current sense and logic driver. It also integrates a current error amplifier to realize constant voltage and constant current control.

Peak current-mode PWM control loop and external adjustable compensation network provides a stable and high efficient operation over a wide range of load currents. By means of an on board current sense resistor and the availability of the current sense pins, a current limit programming is very simple and accurate.

The internal peak current limit, short circuit protection, and over temperature protection, protect the device from accidental damage. The internal fixed switching frequency of 120KHz, and the miniature MSOP-10 package allow building an ultra compact DC/ DC controller with a minimum board space.


Main feature
  • Feedback voltage accuracy ±2%

  • External adjustable limit current

  • Maximum operating voltage 40V

  • Switching frequency 120KHz

  • Voltage and current loop control (proprietary technology)

  • Output voltage cable drop compensation (proprietary technology)

  • Internal soft startup

  • Input undervoltage lockout

  • Over temperature protection

  • MSOP-10 Package


Block Diagram

SD45237.png