General Description

The MAX1678 is a high-efficiency, low-voltage, synchronous-rectified, step-up DC-DC converter intended for use in devices powered by 1 to 3-cell alkaline, NiMH, or NiCd batteries or a 1-cell lithium battery. It guarantees a 0.87V start-up voltage and features a low 37µA quiescent supply current.

Features

♦ 0.87V Guaranteed Start-Up

♦ Up to 90 Efficiency

♦ Built-In Synchronous Rectifier (no external diode)

♦ Ultra-Small µMAX Package, 1.1mm High

♦ 37µA Quiescent Current (85µA from 1.5V battery)

♦ 2µA Logic-Controlled Shutdown

♦ Power-Fail Detector

♦ Dual Mode™ Output: Fixed 3.3V Adjustable 2V to 5.5V

♦ 45mA Output Current at 3.3V for 1-Cell Input

♦ 90mA Output Current at 3.3V for 2-Cell Input

♦ Inductor-Damping Switch Suppresses EMI

Applications

Pagers

Remote Controls

Pointing Devices

Personal Medical Monitors

Single-Cell Battery-Powered Devices