REV. 0

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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.

a

ADP3331

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

SOT-23, anyCAP™ Low Dropout Regulator

FUNCTIONAL BLOCK DIAGRAM

THERMAL

PROTECTION

CC

IN

ADP3331

OUT

GND

Q1

SD

BANDGAP

REF

DRIVER

ERR

FB

Q2

FEATURES

High Accuracy Over Line and Load:

0.7% @ +25 C,

1.4% Over Temperature

Ultralow Dropout Voltage: 140 mV (Typ) @ 200 mA

Can Be Used as a High Current (>1 A) LDO

Controller

Requires Only C

F for Stability

anyCAP = Stable with Any Type of Capacitor

(Including MLCC)

Current and Thermal Limiting

Low Noise

Low Shutdown Current: <2

A

2.6 V to 12 V Supply Range

1.5 V to 10 V Output Range

–40 C to +85 C Ambient Temperature Range

Ultrasmall Thermally Enhanced Chip-on-Lead™

SOT-23-6 Lead Package

APPLICATIONS

Cellular Telephones

Notebook, Palmtop Computers

Battery Powered Systems

PCMCIA Regulator

Bar Code Scanners

Camcorders, Cameras

GENERAL DESCRIPTION

The ADP3331 is a member of the ADP330x family of preci-

sion low dropout anyCAP voltage regulators. The ADP3331

operates with an input voltage range of 2.6 V to 12 V and deliv-

ers a load current up to 200 mA. The ADP3331 stands out

from the conventional LDOs with a novel architecture and an

enhanced process that enables it to offer performance advan-

tages and higher output current than its competition. Its pat-

ented design requires only a 0.47

µF output capacitor for

stability. This device is insensitive to capacitor Equivalent

Series Resistance (ESR), and is stable with any good quality

capacitor, including ceramic (MLCC) types for space restricted

applications. The ADP3331 achieves exceptional accuracy of

±0.7% at room temperature and ±1.4% overall accuracy over

temperature, line and load variations. The dropout voltage of

the ADP3331 is only 140 mV (typical) at 200 mA. This device

also includes a safety current limit, thermal overload protection

and a shutdown feature. In shutdown mode, the ground current is

reduced to less than 2

µA. The ADP3331 has ultralow quies-

cent current 34

µA (typical) in light load situations. The

SOT-23-6 package has been thermally enhanced using Analog

Device’s proprietary Chip-on-Lead feature to maximize power

dissipation.

anyCAP and Chip-on-Lead are trademarks of Analog Devices, Inc.

+

ADP3331

FB

OUT

ERR

ON

OFF

SD

GND

IN

C2

0.47 F

C1

0.47 F

+

R3

330k

R1

R2

Figure 1. Typical Application Circuit