General Description

The MAX603/MAX604 low-dropout, low quiescent current, linear regulators supply 5V, 3.3V, or an adjustable output for currents up to 500mA. They are available in a 1.8W SO package. Typical dropouts are 320mV at 5V and 500mA, or 240mV at 3.3V and 200mA. Quiescent currents are 15µA typ and 35µA max. Shutdown turns off all circuitry and puts the regulator in a 2µA off mode. A unique protection scheme limits reverse currents when the input voltage falls below the output. Other features include foldback current limiting and thermal overload protection.

Features

♦ 500mA Output Current, with Foldback Current Limiting

♦ High-Power (1.8W) 8-Pin SO Package

♦ Dual Mode™ Operation: Fixed or Adjustable Output from 1.25V to 11V

♦ Large Input Range (2.7V to 11.5V)

♦ Internal 500mA P-Channel Pass Transistor

♦ 15µA Typical Quiescent Current

♦ 2µA (Max) Shutdown Mode

♦ Thermal Overload Protection

♦ Reverse-Current Protection