SINGLE/DUAL-OUTPUT BATTERY MONITORS WITH HYSTERESIS REQUIRE NO EXTERNAL COMPONENTS
Note to Editor: The MAX6427–MAX6438 are the first battery monitors with internal hysteresis that offer internally trimmed thresholds that eliminate the need for external components. Low 1µA supply current in a SOT23 package makes these devices the perfect battery-monitor selection for portable equipment.
SUNNYVALE, CA-February 6, 2002-Maxim Integrated Products introduces the MAX6427–MAX6438 battery monitors with hysteresis to eliminate low-battery chatter in battery-operated systems. These small (SOT23), low-power (1µA) devices are perfect for portable, hand-held applications.
In typical systems, when the battery voltage falls below its voltage threshold, the low-battery output asserts and disconnects the load from the system. The battery voltage often recovers and reconnects the load, only to cause the low-battery output to reassert and cause chatter. The MAX6427–MAX6438 provide an upper and lower voltage threshold level (hysteresis window) to eliminate this chatter.
Each device offers a low-battery output that asserts whenever the battery voltage falls below the low-voltage threshold, allowing the system to shut off. The MAX6430/MAX6431/MAX6432 and MAX6436/MAX6437/MAX6438 offer 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.
The MAX6427–MAX6432 are offered with factory-trimmed thresholds that eliminate the need for external components. Factory-trimmed thresholds are available to monitor single lithium-cell applications, as well as dual-cell alkaline/nickel-cadmium/nickel-metal-hydride applications. The MAX6433–MAX6438 provide greater flexibility with user-adjustable versions that allow upper- and lower-voltage trip levels to be set with three external resistors.
The MAX6427/MAX6430/MAX6433/MAX6436 have active-low, push-pull outputs. The MAX6428/MAX6431/MAX6434/MAX6437 have active-low, open-drain outputs, and the MAX6429/MAX6432/MAX6435/MAX6438 have active-high, push-pull outputs.
The MAX6427/MAX6428/MAX6429 are available in a 3-pin SOT23 package. The MAX6430/MAX6431/MAX6432 are available in a 4-pin SOT143 package, the MAX6433/MAX6434/MAX6435 are offered in a 5-pin SOT23 package, and the MAX6436/MAX6437/MAX6438 are offered in a 6-pin SOT23 package. All devices are fully specified from -40°C to +85°C. Prices start at $0.87 for the MAX6427–MAX6429 and MAX6433/MAX6434/
MAX6435. For the MAX6430/MAX6431/MAX6432 and MAX6436/MAX6437/MAX6438 prices start at $1.09 (2500 or 10,000-up, FOB USA).
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MAX6427, MAX6428, MAX6429, MAX6430, MAX6431, MAX6432, MAX6433, MAX6434, MAX6435, MAX6436, MAX6437, MAX6438
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