lm22680mrx-adj National Semiconductor Corporation, lm22680mrx-adj Datasheet

lm22680mrx-adj

Manufacturer Part Number

lm22680mrx-adj

Description

2a Simple Switcher ?step-down Voltage Regulator With Features

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM22680MRX-ADJ.pdf (16 pages)

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Download datasheet (573Kb)

LM22680

2A SIMPLE SWITCHER®, Step-Down Voltage Regulator

with Features

General 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

use complete design using a minimum number of external

components and National’s WEBENCH

National’s WEBENCH

nal component calculation, electrical simulation, thermal sim-

ulation, and Build-It boards for easy design-in. The switching

clock frequency is provided by an internal fixed frequency os-

cillator 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 shut-

down, 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.

Simplified Application Schematic

tool includes features such as exter-

concept provides for an easy to

300807

design tool.

Features

■

Package

■

Applications

■

Wide input voltage range: 4.5V to 42V

Internally compensated voltage mode control

Stable with low ESR ceramic capacitors

200 mΩ N-channel MOSFET

Output voltage option:

±1.5% feedback reference accuracy

Switching frequency of 500 kHz, adjustable between

-40°C to 125°C operating junction temperature range

Precision enable pin

Integrated boot diode

Adjustable soft-start

Fully WEBENCH

Step-down and inverting buck-boost applications

PSOP-8 (Exposed Pad)

Industrial Control

Telecom and Datacom Systems

Embedded Systems

Automotive Telematics and Body Electronics

Conversions from Standard 24V, 12V and 5V Input Rails

-ADJ (outputs as low as 1.285V)

200 kHz and 1 MHz

enabled

30080701

December 12, 2008

www.national.com

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