ADM1087AKSZ-REEL7 (ANALOG DEVICES)

The ADM1087AKSZ-REEL7 is a Voltage Sequencer with high voltage open-drain output stage which can be pulled up to voltage levels as high as 22V through an external resistor. The Simple Sequencing™ circuit provides 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 this device 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. This level shifting property of the ADM1087 ensures compatibility with enable input logic levels of different regulators and converters.