μP監視回路内蔵ヒステリシス付、可変シングル/デュアル出力バッテリモニタ、SOT23パッケージ
SUNNYVALE, CA-August 25, 2003-Maxim Integrated Products
(NASDAQ: MXIM) introduces the MAX6846-MAX6849 adjustable single-/dual-level battery monitors combined with independent microprocessor (µP) supervisory reset circuits. These devices monitor single lithium-ion (Li+) cell or multicell NiMH/NiCd/alkaline applications. The MAX6846-MAX6849 consume only 2.5µA of supply current, making them ideal for portable hand-held applications.
In typical systems, the low-battery output (LBO) asserts and disconnects the load from the system when the battery voltage falls below its threshold. The battery voltage often recovers and reconnects the load, only to cause the LBO to reassert and cause chatter. The MAX6846-MAX6849 eliminates chattering by
providing internal hysteresis. The MAX6846-MAX6849 have user-adjustable thresholds for setting the voltage-trip thresholds. All devices have a low-battery output that can be used to shut the system off when the battery is dead. The MAX6848/MAX6849 have an additional low-battery output that can provide an early low-battery warning, allowing the system to enter a low-power mode or to back up critical data into memory. All low-battery outputs have active-low, open-drain configurations.
The MAX6846-MAX6849 also feature an independent µP supervisory circuit that monitors system voltages from 1.8V to 3.3V. Seven factory-trimmed reset thresholds are available with two reset timeout options of 150ms or 1200ms (min). The MAX6846/MAX6848 have an active-low, open-drain reset, and the MAX6847/MAX6849 have an active-low, push-pull reset output. The MAX6846/MAX6847 also have a one-shot manual-reset input.
The MAX6846-MAX6849 are available in 8-pin SOT23 packages and are fully specified from -40°C to +85°C. Prices start at $1.30 (2500 or 10k-up, FOB USA).
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