Maxim Presents MAX6439 to MAX6442 Battery Monitors

Maxim Integrated Products Inc. (Sunnyvale, CA) presented its new MAX6439 to MAX6442 battery monitors, which feature an internal hysteresis window to eliminate low-battery chatter in battery-operated systems. The battery monitors are offered with factory-trimmed thresholds that eliminate the need for external components. Factory-trimmed thresholds are available to monitor single-cell lithium applications as well as dual-cell alkaline/nickle cadmium/nickel-metal hydride applications.

Each of the ICs offers a low-battery output that asserts whenever the battery voltage falls below its preset low-voltage threshold, allowing the system to shut off. The MAX6441/MAX6442 offers a second low-battery output 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.

The MAX6439 to MAX6442 also have independent microprocessor supervisory circuits that monitor 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 -40°C to +85°C.