The LM20323 is a full featured 500kHz synchronous buck regulator capable of delivering up to 3A of load current. The current mode control loop is externally compensated with only two components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.

The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good (PGOOD) circuit.

The LM20323 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20323 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20323 is offered in an exposed pad 20-pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

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功能相同，但与相比较的设备引脚不同或参数不等效:

LMR33630

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SIMPLE SWITCHER® 3.8V to 36V, 3A Synchronous Buck Converter With Ultra-Low EMI Next-generation 3.8-V to 36-V, 3-A synchronous buck converter with ultra-low EMI.

Technical documentation

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	Type	Title	Date
*	Datasheet	LM20323 36V, 3A 500 kHz Synchronous Buck Regulator datasheet (Rev. C)	Apr. 03, 2013
	Technical article	Minimize the impact of the MLCC shortage on your power application	Mar. 29, 2019
	Selection guide	Power Management Guide 2018 (Rev. R)	Jun. 25, 2018
	User guide	AN-1790 LM20323 Evaluation Board (Rev. B)	May 05, 2013
	User guide	AN-1792 LM20343 Evaluation Board (Rev. B)	May 05, 2013
	Application note	AN-2077 LM20k POL Module (Rev. A)	May 03, 2013

Design & development

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Reference designs

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6V - 18V Input Sync-Buck 0.5A LED Driver Reference Design

PMP10487 — This LM20323 integrated FET sync-buck converter regulates the current in a white LED to 0.5A with minimum parts count. LED current is accurately measured with an INA193 and provides feedback to regulate the output current.

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