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MAX679 - Regulated 3.3V Charge Pump

General Description

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.

Key Features

  • o Regulated 3.3V ±4% Output o Ultra-Small: 1.1mm-High, 8-Pin µMAX Package o No Inductors Required o Up to 1MHz Operation (small external components) o Fits into 0.05 in.2 o Up to 85% Efficiency o 1.8V to 3.6V Input Voltage Range o 50µA Quiescent Supply Current o 1µA Shutdown Current MAX679 ________________________.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-1217; Rev 0; 4/97 Regulated 3.3V Charge Pump _______________General Description 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.