Analog Devices Inc. MAX16165/MAX16166 4-Channel Sequencer & Supervisor

The sequencing is enabled by two inputs, ON and OFF. A rising edge on the ON input initiates power-on sequencing of the channels, whereas a falling edge on OFF input initiates power-off sequencing. When all voltages reach their final values during the power-on sequencing, sequencing was done output DONE asserts high followed by a Power-OK (POK) output after the reset delay timer has expired, allowing the microcontroller (μC) to operate. If any voltage falls below its threshold, the reset output asserts, and all voltage supplies are turned off. When the sequencer initiates a power-off sequencing, the MAX16165/MAX16166 can reverse sequence the outputs.

Output options available are open-drain (MAX16165) and push-pull (MAX16166). The MAX16165/MAX16166 can be daisy-chained to control any number of voltages in a system.

The Analog Devices MAX16165/MAX16166 features a bidirectional active low FAULT input/output, which asserts low during any fault condition. FAULT stays low as long as an undervoltage event is present at UVSET Input, and it is a one-shot output during all other FAULT conditions. An external signal pulling FAULT low disables all outputs immediately. The MAX16165/MAX16166 is available in a 1.63mm x 2.03mm, 20-bump Wafer-Level Package (WLP) and a 4mm x 4mm, 20L TQFN package. The device is fully specified over the -40°C to +125°C operating temperature range.