ADP1109A Analog Devices, ADP1109A Datasheet

ADP1109A

Manufacturer Part Number

ADP1109A

Description

Micropower Low Cost Fixed 3.3 V/ 5 V/ 12 V and Adjustable DC-to-DC Converter

Manufacturer

Analog Devices

Datasheet

1.ADP1109A.pdf (8 pages)

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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.

GENERAL DESCRIPTION

The ADP1109A is a versatile step-up switching regulator. The

device requires only minimal external components to operate as

a complete switching regulator.

The ADP1109A-5 can deliver 100 mA at 5 V from a 3 V input

and the ADP1109A-12 can deliver 60 mA at 12 V from a 5 V

input. The device also features a logic controlled shutdown

capability that, when a logic low is applied, will shut down the

oscillator. The 120 kHz operating frequency allows for the use

of small surface mount components.

The gated oscillator capability eliminates the need for frequency

compensation.

FEATURES

Operates at Supply Voltages 2 V to 9 V

Fixed 3.3 V, 5 V, 12 V and Adjustable Output

Minimum External Components Required

Ground Current: 460 A

Oscillator Frequency: 120 kHz

Logic Shutdown

8-Lead DIP and SO-8 Packages

APPLICATIONS

Cellular Telephones

Single-Cell to 5 V Converters

Laptop and Palmtop Computers

Pagers

Cameras

Battery Backup Supplies

Portable Instruments

Laser Diode Drivers

Hand-Held Inventory Computers

Fixed 3.3 V, 5 V, 12 V and Adjustable

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

Tel: 781/329-4700

Fax: 781/326-8703

REFERENCE

1.25V

GND

SHUTDOWN/PROGRAM

FUNCTIONAL BLOCK DIAGRAM

SENSE

Flash Memory VPP Generator

250k

TYPICAL APPLICATION

COMPARATOR

SHUTDOWN

World Wide Web Site: http://www.analog.com

Micropower Low Cost

33 H

DC-to-DC Converter

SHUTDOWN

PGND

ADP1109A-12

ADP1109A-3.3: R1 = 152k

ADP1109A-5:

ADP1109A-12: R1 = 29k

OSCILLATOR

SENSE

GND

120kHz

ADP1109A

R1 = 83k

DRIVER

22 F

16V

12V

60mA

OUT

PGND

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