ADM1088

Data Sheet Simple Sequencers® in 6-Lead SC70 ADM1088 04591-001 FEATURES FUNCTIONAL BLOCK DIAGRAMS Provide programmable time delays between enable VCC signals Can be cascaded with power modules for multiple supply sequencing ADM1085/ADM1086 Power supply monitoring from 0.6 V Output stages VIN 0.6V CAPACITOR ADJUSTABLE DELAY ENOUT 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 VIN inputs E Low power consumption (15 μA) Specified over –40°C to +125°C temperature range 6-lead SC70 package T APPLICATIONS Desktop/notebook computers, servers Low power portable equipment E Routers Base stations Line cards L Graphics cards GENERAL DESCRIPTION O The ADM1085/ADM1086/ADM1087/ADM1088 are simple sequencing circuits that provide a time delay between the enabling of voltage regulators and/or dc-dc converters at powerup in multiple supply systems. When the output voltage of the S first power module reaches a preset threshold, a time delay is initiated before an enable signal allows subsequent regulators to power up. Any number of these devices can be cascaded with regulators to allow sequencing of multiple power supplies. B Threshold levels can be set with a pair of external resistors in a voltage divider configuration. With appropriate resistor values, O the threshold can be adjusted to monitor voltages as low as 0.6 V. GND CEXT ENIN VCC ADM1087/ADM1088 ...