MAX761

12V/15V or Adjustable, High-Efficiency, Low-IQ, Step-Up DC-DC Converters

Internal 1A Power MOSFET Reduces Component Count and Saves Space for Flash Memory and PCMCIA Applications


Description

The MAX761/MAX762 step-up switching regulators provide high efficiency over a wide range of load currents, delivering up to 150mA. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency with heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.

The MAX761/MAX762 input voltage range is 2V to 16.5V. Output voltages are preset to 12V (MAX761) and 15V (MAX762), or they can be set with two external resistors. With a 5V input, the MAX761 guarantees a 12V, 150mA output. Its high efficiency, low supply current, fast start-up time, SHDN controlling capability, and small size make the MAX761 ideal for powering flash memory.

The MAX761/MAX762 have an internal 1A power MOSFET, making them ideal for minimum-component, low- and medium-power applications. These devices use tiny external components, and their high switching frequencies (up to 300kHz) allow for small surface-mount magnetics.

For increased output drive capability or higher output voltages, use the MAX770-MAX773, which are similar in design to the MAX761/MAX762, but drive external power MOSFETs. For stepping up to 5V, see the MAX756/MAX757 and MAX856-MAX859 data sheets.
MAX761, MAX762: Typical Operating Circuit MAX761, MAX762: Typical Operating Circuit Enlarge+

Key Features

  • High Efficiency for a Wide Range of Load Currents
  • 12V/150mA Flash Memory Programming Supply
  • 110µA Max Supply Current
  • 5µA Max Shutdown Supply Current
  • 2V to 16.5V Input Voltage Range
  • 12V (MAX761), 15V (MAX762) or Adjustable Output
  • Current-Limited PFM Control Scheme
  • 300kHz Switching Frequency
  • Internal, 1A, N-Channel Power FET
  • LBI/LBO Low-Battery Comparator

Applications/Uses

  • Battery-Powered Applications
  • Flash Memory Programming
  • High-Efficiency DC-DC Converters
  • PCMCIA Cards

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