REV. A

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a

ADP3303A

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

Tel: 781/329-4700

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

Fax: 781/326-8703

© Analog Devices, Inc., 1999

High Accuracy anyCAP™ Adjustable

200 mA Low Dropout Linear Regulator

FUNCTIONAL BLOCK DIAGRAM

Q2

THERMAL

PROTECTION

Q1

CC

BANDGAP

REF

DRIVER

ADP3303A

OUT

IN

ERR

SD

GND

FB

ADP3303A

ERR

OUT

IN

FB

R1

C2

1 F

ON

OFF

SD

GND

C1

0.47 F

R2

R3

330k

SD

Figure 1. Typical Application Circuit

FEATURES

High Accuracy Over Line and Load:

0.8% @ +25 C,

1.4% Over Temperature

Ultralow Dropout Voltage: 150 mV Typical @ 200 mA

anyCAP = Stable with All Types of Capacitors

(Including MLCC)

Current and Thermal Limiting

Low Noise

Dropout Detector

Low Shutdown Current: 1

A

3.2 V to 12 V Supply Range

Adjustable 2.2 V to 10 V Output Range

–20 C to +85 C Ambient Temperature Range

Thermally Enhanced TSSOP-14 Package

APPLICATIONS

Cellular Telephones

Notebook, Palmtop Computers

Battery Powered Systems

Portable Instruments

Post Regulator for Switching Supplies

Bar Code Scanners

GENERAL DESCRIPTION

The ADP3303A is a member of the ADP330x family of preci-

sion low dropout anyCAP voltage regulators. The ADP3303A

stands out from conventional LDOs with a novel architecture,

an enhanced process and a new package. Its patented design

requires only a 1

µF output capacitor for stability. This device is

insensitive to output capacitor ESR (Equivalent Series Resis-

tance), and is stable with any good quality capacitor, including

ceramic types (MLCC) for space restricted applications. The

ADP3303A achieves exceptional accuracy of

±0.8% at room

temperature and

±1.4% overall accuracy over temperature, line

and load variations. The dropout voltage of the ADP3303A is

only 150 mV (typical) at 200 mA.

In addition to the new architecture and process, ADI’s new

proprietary thermally enhanced package (Thermal Coastline)

can handle 1 W of power dissipation without an external heat

sink or large copper surface on the PC board. This keeps PC

board real estate to a minimum and makes the ADP3303A very

attractive for use in portable equipment.

The ADP3303A operates over an input voltage range of 3.2 V

to 12 V and delivers a load current in excess of 200 mA. The

output voltage can be adjusted from 2.2 V to 10 V using an

external resistor divider. It also features an error flag that signals

when the device is about to lose regulation or when the short

circuit or thermal overload protection is activated. Other fea-

tures include shutdown and optional noise reduction capabilities.

anyCAP is a trademark of Analog Devices Inc.