19-1457; Rev 3; 8/05
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The MAX1644 constant-off-time, PWM step-down DCDC converter is ideal for use in applications such as PC cards, CPU daughter cards, and desktop computer bus-termination boards.
The device features internal synchronous rectification for high efficiency and reduced component count.
It requires no external
Schottky diode.
The internal 0.
10Ω PMOS power switch and 0.
10Ω NMOS synchronous-rectifier switch easily deliver continuous load currents up to 2A.
The MAX1644 produces a preset +3.
3V or +2.
5V output voltage or an adjustable output from +1.
1V to VIN.
It achieves efficiencies as high as 95%.
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m o c .
2A, Low-Voltage, Step-Down
Regulator with U 4 t Synchronous Rectific...