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5V/12V/15V or Adjustable, High-Efficiency Low-IQ, Step-Up DC-DC Controllers

We Recommend Improved Performance Devices for New Designs

Product Details

Key Features

Simplified Block Diagram

Technical Docs

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Key Features

  • 90% Efficiency for 10mA to 1A Load Currents
  • Up to 15W Output Power
  • 110µA Max Supply Current
  • 5µA Max Shutdown Current
  • 2V to 16.5V Input Range (MAX770/MAX771/MAX772)
  • Internal Shunt Regulator for High Input Voltages (MAX773)
  • Preset or Adjustable Output Voltages
    • MAX770: 5V or Adjustable
    • MAX771: 12V or Adjustable
    • MAX772: 15V or Adjustable
    • MAX773: 5V, 12V, 15V, or Adjustable
  • Current-Limited PFM Control Scheme
  • 300kHz Switching Frequency

Applications/Uses

  • Battery-Powered Applications
  • Flash Memory Programming
  • High-Efficiency DC-DC Converters
  • Palmtops, Handy Terminals
  • Portable Communicators
  • Positive LCD-Bias Generators

Description

The MAX770-MAX773 step-up switching controllers provide 90% efficiency over a 10mA to 1A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters).

These ICs use tiny external components. Their high switching frequencies (up to 300kHz) allow surface-mount magnetics of 5mm height and 9mm diameter.

The MAX770/MAX771/MAX772 accept input voltages from 2V to 16.5V. Output voltages are preset at 5V, (MAX770), 12V (MAX771), and 15V (MAX772); they can also be adjusted using two resistors.

The MAX773 accepts inputs from 3V to 16.5V. For a wider input range, it features an internal shunt regulator that allows unlimited higher input voltages. The MAX773's output can be set to 5V, 12V, or 15V, or it can be adjusted with two resistors.

The MAX770-MAX773 drive external N-channel MOSFET switches, allowing them to power loads up to 15W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs.

Simplified Block Diagram

MAX770, MAX771, MAX772, MAX773: Typical Operating Circuit MAX770, MAX771, MAX772, MAX773: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.