ADM1088 Datasheet

• Provide time delays between enabling of regulators
• Can be cascaded with regulators for multiple supply sequencing
• Output stages
  High voltage (up to 22 V) Push-pull output (ADM1088)
• Power supply monitoring from 0.6 V
• Capacitor adjustable time delays
• High voltage (up to 22 V) enable input
• Low power consumption (15 µA)
• Specified over –40°C to +125°C temperature range
• 6-lead SC70 package

• Desktop/notebook computers, servers
• Low power portable equipment
• Routers
• Base stations
• Line cards
• Graphics cards

The ADM1088 are Simple Sequencing™ circuits which provide a time delay between the enabling of voltage regulators at power-up in multiple supply systems. When the output voltage of the first regulator 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.

Threshold levels can be set with a pair of external resistors in a voltage divider configuration. By choosing appropriate resistor values, the threshold can be adjusted to monitor voltages as low as 0.6V.

The ADM1088 have push-pull output stages, with active-high (ENOUT) and active-low (ENOUT) logic outputs, respectively.

All four models have a dedicated enable input pin which allows the output signal to the regulator to be controlled externally. This is an active-low input (ENIN) for the ADM1088.

The Simple Sequencers™ are specified over the extended –40°C to +125°C temperature range, and with low current consumption of 15µA (typ) and 6-lead SC70 packaging, they are suitable for low power portable applications.