ADM1085/ADM1086/ADM1087/ADM1088 is a simple sequencer that provides programmable time delays between enable signals. It can be cascaded with power modules for multiple supply sequencing and also monitors power supply from 0.6V. The output stages are high voltage (up to 22V) open-drain output (ADM1085/ADM1087) and push-pull output (ADM1086/ADM1088) with capacitor-adjustable time delays. It has high voltage (up to 22V) enable and VIN inputs with low power consumption (15µA). It is specified over –40°C to +125°C temperature range and packaged in a 6-lead SC70 package.
The ADM1085/ADM1086/ADM1087/ADM1088 are simple sequencing circuits designed to provide a time delay between the enabling of voltage regulators and/or dc-dc converters in multiple supply systems. These devices initiate a time delay once the output voltage of the first power module reaches a preset threshold, allowing subsequent regulators to power up in a controlled sequence. Any number of these devices can be cascaded to sequence multiple power supplies, with threshold levels adjustable via external resistors to monitor voltages as low as 0.6 V.
| Supply Current | 15 µA (typ) |
|---|---|
| Operating Temperature Range | -40°C to +125°C |
| Package | 6-lead SC70 |
| Vin Operating Voltage Range | 0 to 22 V |
| Vin Rising Threshold | 0.6 V (typ) |
| Vin Falling Threshold | 0.585 V (typ) |
| Vin Hysteresis | 15 mV |
| CEXT Charge Current | 250 nA (max) |
The devices can monitor voltages as low as 0.6 V by choosing appropriate resistor values.
Yes, any number of these devices can be cascaded with regulators to allow sequencing of multiple power supplies.
The parts are available in a 6-lead SC70 package.