General Description
The AAT3603 is a member of AnalogicTech’s Total Power Management ICTM (TPMICTM) product family. It contains a single-cell Lithium Ion/Polymer battery charger, a fully integrated step-down converter and 5 low dropout (LDO) regulators. The device is ideal for low cost handheld portable GSM or CDMA mobile telephones.

Features
• Voltage Regulator VIN Range: 4.5V to 6V
• Low Cost Power Integration
• Low Standby Current
    ▪ 170μA (typ) w/ Buck (Core), LDO1 (PowerDigital), and LDO2 (PowerAnalog) Active, No Load
• One Step-Down Buck Converter (Core)
    ▪ 1.8V, 300mA Output
    ▪ 1.5MHz Switching Frequency
    ▪ Fast Turn-On Time (120μs typ)
• Five LDOs Programmable with I2C
    ▪ LDO1: 3.0V, 300mA (PowerDigital)
    ▪ LDO2: 3.0V, 150mA (PowerAnalog or PLL)
    ▪ LDO3: 3.0V, 150mA (TCXO)
    ▪ LDO4: 3.0V, 150mA (TX)
    ▪ LDO5: 3.0V, 150mA (RX)
    ▪ PSRR: 60dB@10kHz
    ▪ Noise: 50μVrms for LDO3, LDO4, and LDO5
• One Battery Charger
    ▪ Digitized Thermal Regulation
    ▪ Charge Current Programming up to 1.4A
    ▪ Charge Current Termination Programming
    ▪ Automatic Trickle Charge for Battery Preconditioning (2.8V Cutoff)
• Adapter OK (ADPP) and Reset (RESET) Timer Outputs
• Separate Enable Pins for Supply Outputs
• Over-Current Protection
• Over-Temperature Protection
• 5x5mm TQFN55-36 Package

Applications
• Digital Cameras
• GSM or CDMA Cellular Phones
• Handheld Instruments
• PDAs and Handheld Computers
• Portable Media Players