ADP1111ANZ-12 데이터 시트보기 (PDF) - Analog Devices

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ADP1111ANZ-12

Micropower, Step-Up/Step-Down SW Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V

Analog Devices 

a Micropower, Step-Up/Step-Down SW

Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V

ADP1111

FEATURES

Operates from 2 V to 30 V Input Voltage Range

72 kHz Frequency Operation

Utilizes Surface Mount Inductors

Very Few External Components Required

Operates in Step-Up/Step-Down or Inverting Mode

Low Battery Detector

User Adjustable Current Limit

Internal 1 A Power Switch

Fixed or Adjustable Output Voltage

8-Pin DIP or SO-8 Package

APPLICATIONS

3 V to 5 V, 5 V to 12 V Step-Up Converters

9 V to 5 V, 12 V to 5 V Step-Down Converters

Laptop and Palmtop Computers

Cellular Telephones

Flash Memory VPP Generators

Remote Controls

Peripherals and Add-On Cards

Battery Backup Supplies

Uninterruptible Supplies

Portable Instruments

GENERAL DESCRIPTION

The ADP1111 is part of a family of step-up/step-down switch-

ing regulators that operates from an input voltage supply of 2 V

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

The ADP1111 can be programmed to operate in step-up/step-

down or inverting applications with only 3 external components.

The fixed outputs are 3.3 V, 5 V and 12 V; and an adjustable

version is also available. The ADP1111 can deliver 100 mA at

5 V from a 3 V input in step-up mode, or it can deliver 200 mA

at 5 V from a 12 V input in step-down mode.

FUNCTIONAL BLOCK DIAGRAMS

SET

ADP1111

A2

VIN

GAIN BLOCK/

ERROR AMP

1.25V

REFERENCE

A1

OSCILLATOR

COMPARATOR

DRIVER

A0

ILIM

SW1

GND

FB

SET

SW2

VIN

1.25V

REFERENCE

R1

A2

GAIN BLOCK/

ERROR AMP

ADP1111-5

ADP1111-12

A0

ILIM

SW1

A1

OSCILLATOR

COMPARATOR

R2 220k

DRIVER

SW2

GND

SENSE

Maximum switch current can be programmed with a single

resistor, and an open collector gain block can be arranged in

multiple configuration for low battery detection, as a post linear

regulator, undervoltage lockout, or as an error amplifier.

If input voltages are lower than 2 V, see the ADP1110.

REV. 0A

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.

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