Datasheet MAX1771 (Maxim)

ПроизводительMaxim
Описание12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller
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12V or Adjustable, High-Efficiency,. Low IQ, Step-Up DC-DC Controller. General Description. Features

Datasheet MAX1771 Maxim

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EVALUATION KIT AVAILABLE MAX1771 AVAILABLE
12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller General Description Features
The MAX1771 step-up switching controller provides ♦
90% Efficiency for 30mA to 2A Load Currents
90% efficiency over a 30mA to 2A load. A unique cur- rent-limited pulse-frequency-modulation (PFM) control ♦
Up to 24W Output Power
scheme gives this device the benefits of pulse-width- ♦
110µA (max) Supply Current
modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. ♦
5µA (max) Shutdown Current
2mA to 10mA for PWM converters). ♦
2V to 16.5V Input Range
This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows sur- ♦
Preset 12V or Adjustable Output Voltage
face-mount magnetics of 5mm height and 9mm diame- ♦
Current-Limited PFM Control Scheme
ter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted ♦
Up to 300kHz Switching Frequency
using two resistors. ♦
Evaluation Kit Available
The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770–MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide
Ordering Information
a 200mV current limit at full load, and switch to 100mV for light loads.
PART TEMP RANGE PIN-PACKAGE
The MAX1771 drives an external N-channel MOSFET MAX1771CPA 0°C to +70°C 8 Plastic DIP switch, allowing it to power loads up to 24W. If less power MAX1771CSA 0°C to +70°C 8 SO is required, use the MAX756/MAX757 or MAX761/MAX762 MAX1771C/D 0°C to +70°C Dice* step-up switching regulators with on-board MOSFETs. An MAX1771EPA -40°C to +85°C 8 Plastic DIP evaluation kit is available. MAX1771ESA -40°C to +85°C 8 SO
Applications
MAX1771MJA -55°C to +125°C 8 CERDIP** Positive LCD-Bias Generators * Contact factory for dice specifications. ** Contact factory for availability and processing to MIL-STD-883B. Flash Memory Programmers
Functional Diagrams
High-Power RF Power-Amplifier Supply Palmtops/Hand-Held Terminals Battery-Powered Applications Portable Communicators
Pin Configuration Typical Operating Circuit
TOP VIEW INPUT 2V TO VOUT OUTPUT 12V EXT 1 8 CS EXT N 2 MAX1771 V+ 7 GND MAX1771 ON/OFF SHDN CS 3 6 FB AGND 4 5 SHDN REF REF V+ FB AGND GND
DIP/SO Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-0263; Rev 2; 3/02
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