LM22677 5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM22677TJ-5.0/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22677 TJ-5.0
LM22677TJ-ADJ/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22677 TJ-ADJ
LM22677TJE-5.0/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22677 TJ-5.0
LM22677TJE-ADJ/NOPB		TO-263 THIN	7	1	260	Detail	Download	N/A	NSUZXYTTE# LM22677 TJ-ADJ

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Description

The LM22677 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 switching frequency can also be adjusted with an external resistor or synchronized to an external clock up to 1MHz. It is also possible to self-synchronize multiple regulators to share the same switching frequency. The LM22677 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.

Features

Applications

Diagrams

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