Power supply supervisory ICs

These multi-voltage supervisory ICs are designed with new circuits for monitoring negative-voltage and over- and under-voltage conditions.
July 13, 2009

Functional Block Diagram for ADM2914 Quad UV-OV PositiveNegative Voltage Supervisor
The ADM2914 and the ADM12914 quad-channel voltage

supervisors, and ADM6339 microprocessor supervisor ICs enhance overall system

reliability by helping ensure voltage levels remain within specified levels.

The new circuits provide up to twice the accuracy of other devices designed to

monitor voltage supply rails in communications, industrial and instrumentation

applications.

The ADM12914 detects over-voltage and under-voltage (OV/UV)

conditions with 1.5 times the accuracy of competing supervisory circuits. The

supervisory IC prevents power supplies in medical ultrasound,

telecommunications equipment and other applications from slipping out of range.

This is especially important in today’s power supply systems, which often

operate at below 1 V and where an over-voltage condition could cause

catastrophic system failure. The ADM2914/ADM12914 also includes an input-supply

shunt regulator that enables the device to be run off of higher-voltage

supplies, including 12-V operation in communications infrastructure equipment

and lithium-ion batteries used in hybrid vehicles.

The ADM6339 quad microprocessor voltage supervisory circuit

provides two times the accuracy of other devices in its class, and monitors up

to three positive and one negative voltage supplies. The ADM6339 incorporates

internally pre-trimmed under-voltage threshold options for monitoring 1.8 V,

2.5 V, 3 V, 3.3 V, 5 V and -5 V supply voltages. It is available with one to

three adjustable threshold options to extend design flexibility.

As part of a complete signal chain, the ADM12914 and ADM6339

supervisory circuits are compatible with ADI’s point-of-load regulators,

including the ADP1740, ADP1741 and ADP2102, ADP2105, ADP2106, ADP2107, ADP2108,

family.

Analog Devices Inc.

www.analog.com