GENERAL DESCRIPTION

The ADM1085/ADM1086/ADM1087/ADM1088 are simple sequencing circuits that provide a time delay between the enabling of voltage regulators and/ordc-dc converters atpower upin multiple supply systems. When the output voltage of the first power module reaches a preset threshold,atime delayis initiated before an enable signal allows subsequent regulators to power up. Any number ofthese devices can be cascaded with regulators toallow sequencing ofmultiple power supplies.

FEATURES

Provide programmable time delays between enable signals

Can be cascadedwith power modules for multiple supply sequencing

Power supply monitoring from 0.6 V Output stages:

High voltage (up to 22 V) open-drain output (ADM1085/ADM1087)

Push-pull output (ADM1086/ADM1088)

Capacitor-adjustable time delays

High voltage (up to 22 V) Enable and VINinputs

Low power consumption (15 µA)

Specified over –40°C to +125°Ctemperature range

6-leadSC70package

APPLICATIONS

Desktop/notebook computers,servers

Low power portable equipment

Routers

Base stations

Line cards

Graphics cards