LM22680 2A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM22680MR-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22680 -ADJ
LM22680MRE-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22680 -ADJ
LM22680MRX-ADJ/NOPB		PSOP	8	3	260	Detail	Download	N/A	NSXYTT L22680 -ADJ

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Description

The LM22680 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 2A 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 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 LM22680 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. 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 source£ºShenZhen henlito electronic co.,ltd. web:www.henlito.com