LM22671MRE-5.0 NSC [National Semiconductor], LM22671MRE-5.0 Datasheet

LM22671MRE-5.0

Manufacturer Part Number

LM22671MRE-5.0

Description

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM22671MRE-5.0.pdf (18 pages)

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500 mA SIMPLE SWITCHER®, Step-Down Voltage

Regulator with Features

General Description

The LM22671 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 500

mA loads with excellent line and load regulation characteris-

tics. 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

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 1 MHz. It is also possible to self-

synchronize multiple regulators to share the same switching

frequency. The LM22671 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

300768

LM22671/LM22671Q

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 options:

±1.5% feedback reference accuracy

Switching frequency of 500 kHz, adjustable between 200

kHz and 1 MHz

-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

LM22671Q is an Automotive Grade product that is AEC-

Q100 grade 1 qualified (-40°C to +125°C operating

junction temperature)

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)

-5.0 (output fixed to 5V)

enabled

30076801

December 10, 2010

www.national.com

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