LM22679 5A 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
LM22679TJ-5.0/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22679 TJ-5.0
LM22679TJ-ADJ/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22679 TJ-ADJ
LM22679TJE-5.0/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22679 TJ-5.0
LM22679TJE-ADJ/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22679 TJ-ADJ

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Description

The LM22679 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 5A 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 LM22679 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.

Applications

Diagrams

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image