MAX773
5V/12V/15V or Adjustable, High-Efficiency Low-IQ, Step-Up DC-DC Controllers
We Recommend Improved Performance Devices for New Designs
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Overview
Features and Benefits
- 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
Product Details
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.
Applications
- Battery-Powered Applications
- Flash Memory Programming
- High-Efficiency DC-DC Converters
- Palmtops, Handy Terminals
- Portable Communicators
- Positive LCD-Bias Generators
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Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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