ADM6840

The ADM6840 is a sequencer and a supervisor that can sequence and monitor up to six or eight voltages. This device provides an adjustable delay when each supply is turned on and monitors the voltage of each power supply.

The ADM6840 operates from a supply range of 2.7V to 15V and has an internal regulator output (ABP) that supplies power to internal circuits.

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 the OFF Input initiates power-off sequencing. During the power-on sequencing, when all the voltages reach their final values, the DONE output asserts high, followed by the Power-OK (POK) output after the reset timeout period (t_RP) has expired, allowing the microcontroller to operate. If any voltage falls below its monitor threshold (V_{MON_TH}), the POK asserts low, and all outputs disable simultaneously, turning off all sequenced power supplies. When the sequencer initiates power-off sequencing, the ADM6840 can reverse-sequence the outputs.

The ADM6840 is an open-drain reset output and can be daisy-chained indefinitely to control any number of voltages in a system.

The ADM6840 features a bidirectional active-low FAULT input/output, which asserts low during any fault condition. It is a one-shot pulse output during any fault conditions. An external signal pulling FAULT low disables all outputs immediately. The ADM6840 is available in a 2.46mm x 2.46mm, 25-bump Wafer-Level Package (WLP) (0.5 mm pitch), a 4mm x 4mm (24L), and a 5mm x 5mm (28L) TQFN package. The device is fully specified over the -40°C to +125°C operating temperature range.

APPLICATIONS

• Telecom Equipment
• Test Equipment
• Servers and Network Cards
• Healthcare Imaging
• Industrial Sensors and Motor Controls
• FPGA/ASIC Power Supply Sequencing
• Microprocessor and Microcontroller Sequencing
• Multi-Supply Sequencing