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LM2716 Dual (Step-up and Step-down) PWM DC/DC Converter

February 2004

LM2716

Dual (Step-up and Step-down) PWM DC/DC Converter

General Description

The LM2716 is composed of two PWM DC/DC converters. A

buck (step-down) converter is used to generate a fixed out-

put voltage. A boost (step-up) converter is used to generate

an adjustable output voltage. Both converters feature low

R

DSON

(0.16鈩?and 0.12鈩? internal switches for maximum

efficiency. Operating frequency can be adjusted anywhere

between 300kHz and 600kHz allowing the use of small

external components. External soft-start pins for each en-

ables the user to tailor the soft-start times to a specific

application. Each converter may also be shut down indepen-

dently with its own shutdown pin. The LM2716 is available in

a low profile 24-lead TSSOP package.

Features

n

Fixed buck converter with a 1.8A, 0.16鈩? internal switch

n

Adjustable boost converter with a 3.6A, 0.12鈩? internal

switch

n

Adjustable boost output voltage up to 20V

n

Operating input voltage range of 4V to 20V

n

Input undervoltage protection

n

300kHz to 600kHz pin adjustable operating frequency

n

Over temperature protection

n

Small 24-Lead TSSOP package

n

Patented current limit circuitry

Applications

n

n

n

n

TFT-LCD Displays

Handheld Devices

Portable Applications

Cellular Phones/Digital Camers

Typical Application Circuit

20071201

漏 2004 National Semiconductor Corporation

DS200712

www.national.com

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