General Description

The ILC7281 provides two independant 150mA low dropout (LDO) voltage regulators and power supply reset monitor in an 8-pin MSOP package. Each regulator output is independantly short circuit protected and has independant shutdown. The device offers a unique combination of low dropout voltage and low quiescent current of CMOS and low noise and high ripple rejection characteristics of bipolar LDO regulators. Moreover, only one input capacitor is required. The power supply reset monitor is available in a ±1 accurate trip voltage to fit most microprocessor applications. Even though its output can sink 2mA, the monitor draws only 1µA in normal operation. Additionally, a built-in hysteresis of 5 of detect voltage simplifies system design.

Features

• Guaranteed 150mA output per regulator

• Ultra low 150mV dropout at 150mA

• 1 output voltage accuracy

• Built-in hysteresis of 5 of detection voltage

• Requires only 0.47µF output capacitor

• Only 30µA ground current at 150mA load

• 75dB ripple rejection at 1kHz (COUT = 0.47µF)

• 80µVRMS noise at BW = 300Hz to 50kHz

• Excellent line and load transient rsponse

• Over current / over temperature protection

• 8-pin MSOP package

• -80dB cross talk

Applications

• Cellular Phones, pagers and wireless headsets

• Microprocessor reset circuits

• Palmtops, oragnizers, PDA’s and portable electronics

• Microprocessor reset circuits

• Battery powered portable appliances

• Memory battery back-up circuitry