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MAX651 - Step-Down DC-DC Controllers

General Description

The MAX649/MAX651/MAX652 BiCMOS, step-down DCDC switching controllers provide high efficiency over three decades of load current.

Key Features

  • o o o o o o o More than 90% Efficiency (10mA to 1.5A Loads) More than 12.5W Output Power 100µA Max Quiescent Supply Current 5µA Max Shutdown Supply Current Less than 1.0V Dropout Voltage 16.5V Max Input Voltage 5V (MAX649), 3.3V (MAX651), 3V (MAX652), or Adjustable Output Voltage o Current-Limited Control Scheme o Up to 300kHz Switching Frequency MAX649/MAX651/MAX652 ______________Ordering Information PART MAX649CPA MAX649CSA MAX649C/D MAX649EPA MAX649ESA MAX649MJA TEMP. RANGE 0°C to +70°C 0°C.

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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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19-0225; Rev 3; 9/97 K ATION EVALU BLE AVAILA IT 5V/3.3V/3V or Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Controllers _______________General Description The MAX649/MAX651/MAX652 BiCMOS, step-down DCDC switching controllers provide high efficiency over three decades of load current. A unique, current-limited 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). The result is high efficiency over loads ranging from 10mA to more than 2.5A. These devices use miniature external components. Their high switching frequency (up to 300kHz) allows for less than 9mm diameter surface-mount inductors.