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.

特性 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