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Maxim battery monitors eliminate battery chatter

Posted: 24 Dec 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max6439? max6442? max6441? max6440?

The MAX6439 to MAX6442 battery monitor from Maxim Integrated Products Inc. features an internal hysteresis window to eliminate low-battery chatter in battery-operated systems.

In typical systems, when the battery voltage falls below its voltage threshold, the low-battery output (LBO) asserts and disconnects the load from the system. When the battery voltage recovers and reconnects the load, the LBO reasserts and cause chatter.

Each of the ICs offer an LBO that asserts whenever the battery voltage falls below its preset low-voltage threshold, allowing the system to shut off. The MAX6441 and MAX6442 offer a second LBO as an early warning indicator to allow the system to enter a low-power mode or back up critical data into memory. A third output is available as a power-good indicator. All low-battery outputs have active-low, open-drain configurations.

These battery monitors are offered with factory-trimmed thresholds that eliminate the need for external components. Factory-trimmed thresholds are available to monitor single Li+ cell applications as well as dual-cell Alkaline/NiCd/NiMH applications.

The MAX6439 to MAX6442 also have an independent microprocessor supervisory circuit that monitors system voltages from 1.8V to 3.3V. Seven factory-trimmed reset thresholds are available with two minimum reset timeout options of 150ms or 1200ms. The MAX6439/MAX6441 have an active-low, open-drain reset, while the MAX6440/MAX6442 have an active-low, push-pull reset output.

All devices are available in a SOT23 package and are fully specified from -40C to 85C.

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