MAX756, MAX757

3.3V/5V/Adjustable-Output, Step-Up DC-DC Converters

For New Designs, We Recommend Improved Performance Devices, MAX1674/MAX1675/MAX1676
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Active: In Production.


The MAX756/MAX757 are CMOS step-up DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX756 accepts a positive input voltage down to 0.7V and converts it to a higher pin-selectable output voltage of 3.3V or 5V. The MAX757 is an adjustable version that accepts an input voltage down to 0.7V and generates a higher adjustable output voltage in the range from 2.7V to 5.5V. Typical full-load efficiencies for the MAX756/MAX757 are greater than 87%.

The MAX756/MAX757 provide three improvements over previous devices. Physical size is reduced-the high switching frequencies (up to 0.5MHz) made possible by MOSFET power transistors allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is improved to 87% (10% better than with low-voltage regulators fabricated in bipolar technology). Supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation control scheme.

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 120kB)
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An evaluation board is available: MAX756EVKIT

Key Features

  • Operates Down to 0.7V Input Supply Voltage
  • 87% Efficiency at 200mA
  • 60µA Quiescent Current
  • 20µA Shutdown Mode with Active Reference and LBI Detector
  • 500kHz Maximum Switching Frequency
  • ±1.5% Reference Tolerance Over Temperature
  • Low-Battery Detector (LBI/LBO)
  • 8-Pin DIP and SO Packages


  • 2-Cell and 3-Cell Battery-Operated Equipment
  • 3.3V to 5V Step-Up Conversion
  • Glucose Meters
  • Medical Instrumentation
  • Palmtop Computers
  • Personal Data Communicators/Computers
  • Portable Data-Collection Equipment

Key Specifications:

Step-Up Switching Regulators
Part Number VIN
IOUT1 (max)
Output Adjust. Method Switch Type Power Good Signal DC-DC Outputs Oper. Freq.
min max min max See Notes
MAX757  0.7 5.5 2.7 5.5 0.3 Resistor Internal Yes 1 500 $2.06 @1k
See All Step-Up Switching Regulators (96)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX756, MAX757: Typical Operating Circuit
Typical Operating Circuit

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Information Index

Document Ref.: 19-0113 Rev 2; 1995-01-01
This page last modified: 2007-05-30