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MyMaxim 订阅
主要特征
- Regulated 3.3V ±4% Output
- Ultra-Small: 1.1mm-High, 8-Pin µMAX Package
- No Inductors Required
- Up to 1MHz Operation (small external components)
- Fits into 0.05 in.²
- Up to 85% Efficiency
- 1.8V to 3.6V Input Voltage Range
- 50µA Quiescent Supply Current
- 1µA Shutdown Current
- Only three small capacitors required
应用/用途
- 备用电池升压转换器
- 电池供电应用
- 微型设备
- 转换器
- 双向寻呼
描述
The MAX679 step-up, regulated charge pump generates a 3.3V ±4% output voltage from a 1.8V to 3.6V input voltage (two alkaline, NiCd, or NiMH; or one Lithium-Ion battery). Output current is 20mA (min) from a 2.0V input. Only three external capacitors are needed to build a complete DC-DC converter.
The MAX679's switching frequency is pin selectable at 330kHz or 1MHz to allow trade-offs between lowest supply current and smallest-size capacitors. The logic shutdown function reduces the supply current to 5µA (max) and disconnects the load from the input. Special soft-start circuitry prevents excessive current from being drawn from the battery during start-up. This DC-DC converter requires no inductors and has low EMI. It is available in the ultra-small µMAX® package, which is only 1.11mm high and half the area of an 8-pin SO.
The MAX679's switching frequency is pin selectable at 330kHz or 1MHz to allow trade-offs between lowest supply current and smallest-size capacitors. The logic shutdown function reduces the supply current to 5µA (max) and disconnects the load from the input. Special soft-start circuitry prevents excessive current from being drawn from the battery during start-up. This DC-DC converter requires no inductors and has low EMI. It is available in the ultra-small µMAX® package, which is only 1.11mm high and half the area of an 8-pin SO.
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