REV. A

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a

ADP3303

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., 1998

High Accuracy anyCAP™

200 mA Low Dropout Linear Regulator

FUNCTIONAL BLOCK DIAGRAM

Q2

THERMAL

PROTECTION

Q1

CC

BANDGAP

REF

DRIVER

R1

R2

ADP3303

OUT

IN

ERR

SD

GND

ADP3303-5.0

5

4

6

3

NR

OUT

IN

1

2

7

8

ERR

330k

C2

0.47 F

ON

OFF

SD

C1

0.47 F

SD

GND

Figure 1. Typical Application Circuit

FEATURES

High Accuracy Over Line and Load

0.8% @ at +25 C,

1.4% Over Temperature

Ultralow Dropout Voltage: 180 mV (Typ) @ 200 mA

anyCAP = Stable with All Types of Capacitors

(Including MLCC)

3.2 V to 12 V Supply Range

Current and Thermal Limiting

Low Noise

Dropout Detector

Low Shutdown Current: < 1

A

Thermally Enhanced SO-8 Package

Excellent Line and Load Regulation Performance

APPLICATIONS

Cellular Telephones

Notebook, Palmtop Computers

Battery Powered Systems

Portable Instruments

Post Regulator for Switching Supplies

Bar Code Scanners

GENERAL DESCRIPTION

The ADP3303 is a member of the ADP330x family of preci-

sion low dropout anyCAP voltage regulators. The ADP3303

stands out from the conventional LDOs with a novel architec-

ture, an enhanced process and a new package. Its patented

design requires only a 0.47

µF output capacitor for stability.

This device is insensitive to capacitor Equivalent Series Resis-

tance (ESR) and is stable with any good quality capacitor, in-

cluding ceramic types (MLCC) for space restricted applications.

The ADP3303 achieves exceptional accuracy of

±0.8% at room

temperature and

±1.4% overall accuracy over temperature, line

and load regulations. The dropout voltage of the ADP3303 is

only 180 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 external heatsink

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

real estate to a minimum and makes the ADP3303 very attrac-

tive for use in portable equipment.

The ADP3303 operates with a wide input voltage range from

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

It 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 features include shutdown and

optional noise reduction capabilities. The ADP330x anyCAP

LDO family offers a wide range of output voltages and output

current levels:

ADP3300 (50 mA, SOT-23)

ADP3301 (100 mA)

ADP3302 (100 mA, Dual Output)

ADP3307 (100 mA, SOT-23-6)

ADP3308 (50 mA, SOT-23-5)

ADP3309 (100 mA, SOT-23-5)

anyCAP is a trademark of Analog Devices Inc.