REV. A

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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

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a

ADM869L

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., 2000

2 A, High-Side P-Channel Switch with

Current Limit and Thermal Shutdown

FUNCTIONAL BLOCK DIAGRAM

TEMPERATURE

SENSOR AND

CONTROL

CIRCUITRY

MAIN FET

MIRROR FET

IN

(2.7V TO 5.5V)

OUT

SET

FAULT

GND

ON

10k

TO 100k

0 TO 5.5V

ON

ON

ON

ON

OVERTEMP

ADM869L

CURRENT

LIMIT

AMPLIFIER

1.24V

BANDGAP

REFERENCE

MIRROR

AMPLIFIER

0.1 F

22 F

FEATURES

2 A Load Current

45 m

On Resistance

User-Settable Current Limit

12

A Typical Quiescent Current

10 nA Typical Shutdown Current

40 nA Typical Switch Off Leakage

Short-Circuit Protection

Thermal Shutdown

FAULT Output

Small, 16-Lead QSOP Package

APPLICATIONS

Desktop Computers

Palmtop Computers

Notebook Computers

Hand-Held Instruments

Universal Serial Bus (USB)

GENERAL DESCRIPTION

The ADM869L is a logic controlled P-channel switch with low

on resistance, capable of sourcing up to 2 A from supply voltages

between 2.7 V and 5.5 V. A user-settable current limit allows

the trip current to be set between 400 mA and 2 A with an

accuracy of

±21%. This allows the system power supply to be

protected against short circuits and surge currents in peripheral

loads powered via the ADM869L. Over-current and over-

temperature conditions are signalled by a

FAULT output.

The ADM869L also offers low quiescent current of typically

12

µA and shutdown current of typically 10 nA.