REV. A

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a

ADP3310

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

Precision Voltage

Regulator Controller

FUNCTIONAL BLOCK DIAGRAM

GND

GATE

EN

50mV

IS

ADP3310

+

–

BIAS

NDP6020P

10 F

1 F

IS

GATE

GND

EN

ADP3310

+

–

+

–

50mV

ON

OFF

Figure 1. Typical Application Circuit

FEATURES

1.5% Accuracy Over Line, Load and Temperature

Low 800

A (Typical) Quiescent Current

Shutdown Current: 1

A (Typical)

Stable with 10

F Load Capacitor

+2.5 V to +15 V Operating Range

Fixed Output Voltage Options: 2.8 V, 3 V, 3.3 V, 5 V

Up to 10 A Output Current

SO-8 Package

–40 C to +85 C Ambient Temperature Range

Internal Gate to Source Protective Clamp

Current and Thermal Limiting

Programmable Current Limit

Foldback Current Limit

APPLICATIONS

Desktop Computers

Handheld Instruments

Cellular Telephones

Battery Operated Devices

Solar Powered Instruments

High Efficiency Linear Power Supplies

Battery Chargers

GENERAL DESCRIPTION

The ADP3310 is a precision voltage regulator controller that

can be used with an external Power PMOS device such as the

NDP6020P to form a two chip low dropout linear regulator.

The low quiescent current (800

µA) and the Enable feature

make this device especially suitable for battery powered systems.

The dropout voltage at 1 A is only 70 mV when used with the

NDP6020P, allowing operation with minimal headroom and

prolonging battery useful life. The ADP3310 can drive a wide

range of currents, depending on the external PMOS device used.

Additional features of this device include: high accuracy (

±1.5%)

over line, load and temperature, gate-to-source voltage clamp to

protect the external MOSFET and foldback current limit. A

current limit threshold voltage of 50 mV (typ) allows 50 m

Ω of

board metal trace resistance to provide a 1 A current limit.

The ADP3310 operates from a wide input voltage range from

2.5 V to 15 V and is available in a small SO-8 package.