ADP1173 データシートの表示（PDF） - Analog Devices

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ADP1173

Micropower DC-DC Converter

Analog Devices 

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FEATURES

Operates From 2.0 V to 30 V Input Voltages

Only 110 ␮A Supply Current (Typical)

Step-Up or Step-Down Mode Operation

Very Few External Components Required

Low Battery Detector On-Chip

User-Adjustable Current Limit

Internal 1 A Power Switch

Fixed or Adjustable Output Voltage Versions

8-Pin DIP or SO-8 Package

APPLICATIONS

Notebook and Palmtop Computers

Cellular Telephones

Flash Memory Vpp Generators

3 V to 5 V, 5 V to 12 V Converters

9 V to 5 V, 12 V to 5 V Converters

Portable Instruments

LCD Bias Generators

GENERAL DESCRIPTION

The ADP1173 is part of a family of step-up/step-down switching

regulators that operates from an input supply voltage of as little as

2 V to 12 V in step-up mode and to 30 V in step-down mode.

The ADP1173 consumes as little as 110 µA in standby mode,

making it ideal for applications that need low quiescent current.

An auxiliary gain amplifier can serve as a low battery detector,

linear regulator (under voltage lockout) or error amplifier.

The ADP1173 can deliver 80 mA at 5 V from a 3 V input in

step-up configuration or 100 mA at 5 V from a 12 V input in

step-down configuration. For input voltages of less than 2 V use

the ADP1073.

Micropower

DC-DC Converter

ADP1173

FUNCTIONAL BLOCK DIAGRAMS

SET

VIN

1.245V

REFERENCE

A2

GAIN BLOCK/

ERROR AMP

ADP1173

A1

OSCILLATOR

COMPARATOR

DRIVER

AO

ILIM

SW1

GND

FB

SW2

SET

VIN

1.245V

REFERENCE

ADP1173-3.3

ADP1173-5

ADP1173-12

A2

GAIN BLOCK/

ERROR AMP

A1

OSCILLATOR

AO

ILIM

SW1

R1

GND

COMPARATOR

DRIVER

R2

753kΩ

ADP1173-3.3: R1 = 456kΩ

ADP1173-5: R1 = 250kΩ

ADP1173-12: R1 = 87.4kΩ

SENSE

SW2

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700 World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

© Analog Devices, Inc., 1997

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