LM22673 3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM22673MR-5.0/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22673 5.0
LM22673MR-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22673 ADJ
LM22673MRE-5.0/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22673 5.0
LM22673MRE-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22673 ADJ
LM22673MRX-5.0/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22673 5.0
LM22673MRX-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22673 ADJ
LM22673TJ-5.0/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22673 TJ-5.0
LM22673TJ-ADJ/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22673 TJ-ADJ
LM22673TJE-5.0/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22673 TJ-5.0
LM22673TJE-ADJ/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22673 TJ-ADJ

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Description

The LM22673 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 3A 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 LM22673 series also has built in thermal shutdown and current limiting. The current limit threshold can be adjusted using an external resistor. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor.

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