General Description

The MAX1672 integrates a step-up DC-DC converter with a linear regulator to provide step-up/down voltage conversion. This device provides a constant output voltage for inputs that vary above and below the output voltage. It has a 1.8V to 11V input range and a preset 3.3V or 5V output. The output can also be set from 1.25V to 5.5V using two resistors. Typical efficiency is 85%.

Features

♦ Step-Up/Down Voltage Conversion

♦ 1.8V to 11V Input Range

♦ 3.3V/5V or Adjustable Output Voltage Range

♦ Output Current:

300mA at 5V (VIN ≥ 2.5V)

150mA at 5V (VIN ≥ 1.8V)

♦ Smaller Inductor than SEPIC and Flybacks

♦ Load Disconnects from Input in Shutdown

♦ Supply Current from Battery:

85µA (No-Load)

0.1µA (Shutdown)

♦ PGI/PGO Low-Battery Comparator

♦ 16-Pin QSOP Package (Same Footprint as 8-pin SO)

♦ No External FETs Required

♦ Thermal and Short-Circuit Protection

Applications

Single-Cell, Lithium-Powered Portable Devices

2-Cell to 4-Cell AA Alkaline Hand-Held Equipment

3.3V and Other Low-Voltage Systems

Battery-Powered Devices with AC Input Adapters

Digital Cameras