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