Description

The AS1374 is a ultra-low-noise, low-dropout linear regulator with two seperated outputs. Specifically designed to deliver 200mA continuous output current at each output pin. The LDOs can achieve a low 120mV dropout for 200mA load current and are designed and optimized to work with low-cost, small-capacitance ceramic capacitors.

An integrated P-channel MOSFET pass transistor allows the devices to maintain extremely low quiescent current (30μA).

The AS1374 uses an advanced architecture to achieve ultra-low output voltage noise of 20μVRMS and a powersupply rejection-ratio of better than 85dB (@ 1kHz).

Two active-High enable pins allows to switch on or off each output independently from each other.

The AS1374 requires only 1μF output capacitor for stability at any load.

The device is available in a 6-bump WLP package.

Key Features

• Preset Output Voltages: 1.2V to 3.6V (in 50mV steps)
• Output Noise: 20μVRMS @ 100Hz to 100kHz
• Power-Supply Rejection Ratio: 85dB @ 1kHz
• Low Dropout: 120mV @ 200mA Load
• Stable with 1μF Ceramic Capacitor for any Load
• Guaranteed 200mA Output
• Pull-Down Option in Shutdown (factory set)
• Extremely-Low Quiescent Current: 30μA
• Excellent Load/Line Transient
• Overcurrent and Thermal Protection
• 6-bump WLP Package

Applications

The devices are ideal for mobile phones, wireless phones, PDAs, handheld computers, mobile phone base stations, Bluetooth portable radios and accessories, wireless LANs, digital cameras, personal audio devices, and any other portable, battery-powered application.

Block diagram for AS1374 Low-Dropout IC