LM22674 500 mA SIMPLE SWITCHER®, Step-Down Voltage Regulator with Precision Enable

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM22674MR-5.0/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22674 5.0
LM22674MR-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22674 ADJ
LM22674MRE-5.0/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22674 5.0
LM22674MRE-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22674 ADJ
LM22674MRX-5.0/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22674 5.0
LM22674MRX-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22674 ADJ

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Description

The LM22674 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 500 mA loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version.

The SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external components and National¡¯s WEBENCH ® design tool. National¡¯s WEBENCH ® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in. The switching clock frequency is provided by an internal fixed frequency oscillator which operates at 500 kHz. The LM22674 series also has built in thermal shutdown, current limiting and an enable control input that can power down the regulator to a low 25 µA quiescent current standby condition.

Applications