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MAX1651

Maxim
Part Number MAX1651
Manufacturer Maxim
Description Step-Down DC-DC Controllers
Published May 6, 2005
Detailed Description 19-0305; Rev 2; 9/95 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers _______________Ge...
Datasheet PDF File MAX1651 PDF File

MAX1651
MAX1651

Overview
19-0305; Rev 2; 9/95 5V/3.
3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers _______________General Description The MAX1649/MAX1651 BiCMOS, step-down, DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2.
5A.
A unique, currentlimited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs.
2mA to 10mA for PWM converters).
Dropout performance down to 300mV is provided by a high switch duty cycle (96.
5%) and a low current-sense threshold (110mV).
A high switching frequency (up to 300kHz) allows these devices to use miniature external components.
The MAX1649/MAX1651 have dropout voltages less than 0.
3V at 500mA and accept input voltages up to 16V.
Output voltages are preset at 5V (MAX1649), or 3.
3V (MAX1651).
They can also be adjusted to any voltage from 1.
5V to the input voltage...


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