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ADP3031

2 MHz PWM Boost Switching Regulator

Analog Devices 

PRELIMINARY TECHNICAL DATA

a

2 MHz PWM Boost

Switching Regulator

Preliminary Technical Data

FEATURES

Up to 2 MHz PWM Frequency

Fully Integrated 1.5 A Power Switch

3% Output Regulation Accuracy

Adjustable Output Voltage from 3 V to 12 V

Simple Compensation

Small Inductor and MLC Capacitors

90% Efficiency

Under-voltage Lockout

Shutdown

APPLICATIONS

TFT LCD Bias Supplies

Portable Electronic Instruments

Industrial/Instrumentation Equipment

GENERAL DESCRIPTION

The ADP3031 is a high frequency, step-up DC-DC

switching regulator capable of 12 V boosted output voltage

in a space saving MSOP-8 package. It provides high

efficiency, low-noise operation, and is easy to use. Capable

of operating up to 2 MHz, the high switching frequency and

PWM current mode architecture allow for excellent tran-

sient response, ease of noise filtering, and also small, cost-

saving external inductive and capacitive components. The

current limit and the power switch are integrated completely

on chip.

Capable of operating from 2.5 V to 5.5 V input, the

ADP3031 is ideal for Thin-Film Transistor (TFT) Liquid

Crystal Display (LCD) module applications, where local

point-of-use power regulation is required. Featuring an

adjustable output that supports voltages down to 3 V, the

ADP3031 is ideal to generate today’s low voltage rails,

delivering power efficiently, and simply with minimal

printed circuit board area.

The device is specified over the industrial temperature range

of -40°C to +85°C.

ADP3031

Functional Block Diagram

FB 2

RT 7

REF

COMP

1

ERROR

AMP

gm

IN

6

BIAS

ADP3031

RAMP

GEN

OSC

F/F

RQ

S

COMPARATOR

DRIVER

5 SW

SD 3

8

GND

CURRENT

SENSE

AMPLIFIER

4

PGND

REV. PrB

8/2/02

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:781/329-4700

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

Fax:781/326-8703

©ANALOG DEVICES, INC., 2002

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