ADM1052JR Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

componentes Descripción

Fabricante

ADM1052JR

Precision Dual Voltage Regulator Controller

Analog Devices 

a

FEATURES

Two Independent Controllers on One Chip

Two 2.525 V Outputs

Shutdown Inputs to Control Each Channel

؎2.5% Accuracy Over Line, Load, and Temperature

Low Quiescent Current

Low Shutdown Current

Works with External N-Channel MOSFETs for Low Cost

“Hiccup Mode” Fault Protection

No External Voltage or Current Setting Resistors

Small, 8-Lead SO Package

APPLICATIONS

Desktop Computers

Servers

Workstations

Precision Dual Voltage

Regulator Controller

ADM1052

GENERAL DESCRIPTION

The ADM1052 is a dual, precision, voltage regulator controller

intended for power rail generation and active bus termination

on personal computer motherboards. It contains a precision

1.2 V bandgap reference and two channels consisting of con-

trol amplifiers driving external power devices. Each channel has a

shutdown input to turn off amplifier output and “Hiccup Mode”

protection circuitry for the external power device.

The ADM1052 operates from a 12 V supply. This gives suffi-

cient headroom for the amplifiers to drive external N-channel

MOSFETs, operating as source-followers, as the external series

pass devices. This has the advantage that N-channel devices are

cheaper than P-channel devices of similar performance, and the

circuit is easier to stabilize than one using P-channel devices in

a common-source configuration.

SHDN1

ADM1052

VCC

50␮A

FUNCTIONAL BLOCK DIAGRAM

VCC

BANDGAP

REFERENCE

SHUTDOWN

CONTROL

HICCUP

COMPARATOR

3.3V

CONTROL

AMPLIFIER

FORCE 1

SENSE 1

100␮F

VOUT1

2 ؋ 100␮F

3.3V

SHDN2

VCC

50␮A

VCC

CONTROL

AMPLIFIER

FORCE 2

SENSE 2

SHUTDOWN

CONTROL

HICCUP

COMPARATOR

100␮F

VOUT2

2 ؋ 100␮F

POWER-ON

RESET

CLK/DELAY

GENERATOR

CLOCK

OSCILLATOR

GND

REV. A

Information furnished by Analog Devices is believed to be accurate and

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.

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., 2001

Share Link: