MAX772
5V/12V/15V or Adjustable, High-Efficiency Low-IQ, Step-Up DC-DC Controllers
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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
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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
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
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MAX772
Documentation
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Data Sheet
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MAX770-MAX773: 5V/12V/15V or Adjustable, High-Efficiency Low-IQ, Step-Up DC-DC Controllers Data Sheet (Rev.2)
Documentation
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
|---|---|---|---|---|
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Micropower Boost Regulators1 |
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PRODUCTION |
5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller |
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Evaluation Kits 1
MAX770EVKIT
Evaluation Kit for the MAX770
Product Detail
The MAX770 evaluation kit (EV kit) provides a regulated 5V output voltage from a 3V input source. It drives loads up to 1A with greater than 80% conversion efficiency.
This EV kit is a fully assembled and tested surface-mount circuit board. Additional pads on the bottom of the board accommodate the external feedback resistors for setting different output voltages.
The MAX770 EV kit comes with a MAX770CSA IC, but it can also evaluate the 12V-output MAX771 or 15V-output MAX772-simply order a free sample of the MAX771CSA or MAX772CSA to substitute for the MAX770CSA.
Applications
- Battery-Powered Applications
- Flash Memory Programming
- High-Efficiency DC-DC Converters
- Palmtops, Handy Terminals
- Portable Communicators
- Positive LCD-Bias Generators