General Description

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%.

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

Applications

    3.3V to 5V Step-Up Conversion

    Palmtop Computers

    Portable Data-Collection Equipment

    Personal Data Communicators/Computers

    Medical Instrumentation

    2-Cell & 3-Cell Battery-Operated Equipment

    Glucose Meters