Quad Voltage Monitor and Sequencer

Preliminary Technical Data

ADM1185

Rev. PrK June 2006

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FEATURES

Powered from 2.7V to 5.5V on the VCC pin

Monitors Four Supplies via 0.8% Accurate Comparators

Four inputs can be programmed for voltage levels with

resistor dividers

Three Open-Drain Enable Outputs

Open-Drain Power Good Output

10-pin MSOP Package

APPLICATIONS

Monitor and Alarm Functions

Power Supply Sequencing

Telecommunication and Datacommunication Equipment

PC/Servers

GENERAL DESCRIPTION

The ADM1185 is an integrated four channel voltage monitoring

device. A 2.7V to 5.5V power supply is required on the VCC pin

to power the device.

Four precision comparators monitor four voltage rails. All

comparators have a 0.6V reference with a worst-case accuracy

of 0.8%. Resistor networks external to the VIN1-VIN4 pins set

the trip points.

There are four open-drain outputs on the device. A digital core

interprets the comparator outputs and asserts the outputs as

appropriate.

FUNCTIONAL BLOCK DIAGRAM

OUT1

PWRGD

VCC

VIN2

REF=0.6V

VIN3

REF=0.6V

VIN4

REF=0.6V

REF=0.6V

GND

OUT2

OUT3

LOGIC

POWER AND

REFERENCE

GENERATOR

REF=0.6V

VIN1

ADM1185

Figure 1.

APPLICATIONS DIAGRAM

OUT1

OUT2

OUT3

2.5V OUT

1.8V OUT

PWRGD

VIN4

VIN2

VIN3

POWER

GOOD

EN

Regulator1

3.3V IN

EN

OUT

IN

2.5V OUT

EN

OUT

IN

1.8V OUT

OUT

IN

GND

1.2V OUT

1.2V OUT

Regulator2

Regulator3

VCC

VIN1

ADM1185

Figure 2.