Maxim's MAX6439-MAX6442 battery monitors with hysteresis to eliminate low-battery chatter in battery-operated systems feature a microprocessor supervisory reset circuit for monitoring system voltages from 1,8 V to 3,3 V. These are small (SOT23), low-power (3 µA) devices for portable, handheld applications. 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. The battery voltage often recovers and reconnects the load, only to cause the LBO to reassert and cause chatter. The MAX6439-MAX6442 provide a hysteresis window to eliminate this problem. Each device offers an LBO that asserts whenever the battery voltage falls below its preset low-voltage threshold, allowing the system to shut off. The MAX6441/MAX6442 offer a second LBO as an early warning indicator. A third output is available as a power-good indicator. All low-battery outputs have active-low, open-drain configurations.
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