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MAX1651 - Step-Down DC-DC Controllers

Description

The MAX1649/MAX1651 BiCMOS, step-down, DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2.5A.

Features

  • o o o o o o o More than 90% Efficiency (10mA to 1.5A Loads) More than 12.5W Output Power Less than 0.3V Dropout Voltage at 500mA 100µA Max Quiescent Supply Current 5µA Max Shutdown Supply Current 16V Max Input Voltage 5V (MAX1649), 3.3V (MAX1651), or Adjustable Output Voltage o Current-Limited Control Scheme o Up to 300kHz Switching Frequency o Up to 96.5% Duty Cycle MAX1649/MAX1651 ______________Ordering Information PART MAX1649CPA MAX1649CSA MAX1649C/D MAX1649EPA MAX1649ESA MAX1651CPA MAX165.

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Full PDF Text Transcription

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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.
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