GENERAL DESCRIPTION

The ADM6819 and ADM6820 are simple power supply sequencers with FET drive capability for enhancing N-channel MOSFETs. These devices can monitor a primary supply voltage and enable/disable an external N-channel FET for a secondary supply. The ADM6819 has the ability to monitor two supplies. When more than two voltages require sequencing, multiple ADM6819/ADM6820 devices can be cascaded to achieve this. The devices operate over a supply range of 2.95 V to 5.5 V.

FEATURES

Single chip enables power supply sequencing of two

supplies

On-board charge pump fully enhances N-channel FET

Adjustable primary supply monitor to 0.618 V

Delay from primary supply to secondary supply enabled

Fixed 300 ms delay (ADM6819)

Capacitor adjustable delay (ADM6820)

Logic/analog driven enable input (ADM6819)

−40°C to +85°C operating range

Packaged in small 6-lead SOT-23 package

Pin-to-pin compatibility with MAX6819/MAX6820

APPLICATIONS

Multivoltage systems

Dual voltage microprocessors/FPGAs/ASICs/DSPs

Network processors

Telecom and datacom systems

PC/server applications