AAT3603 Buy Now
Total Power Solution for Portable Applications

The AAT3603 is a member of AnalogicTech’s Total Power Management IC™ (TPMIC™) 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.

The battery charger is a complete thermally regulated constant current/constant voltage linear charger. It includes an integrated pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status, and charge termination. The charging current, charge termination current, and recharge voltage are programmable with an external resistor and/or by a standard I²C interface.

The step-down DC/DC converter is integrated with internal compensation and operates at a switching frequency of 1.5MHz, thus minimizing the size of external components while keeping switching losses low and efficiency greater than 95%. All LDO output voltages are programmable using the I²C interface.

The five LDOs offer 60dB power supply rejection ratio (PSRR) and low noise operation making them suitable for powering noise-sensitive loads.

All six voltage regulators operate with low quiescent current. The total no load current when the step-down converter and 2 LDOs are enabled is only 170µA.

The AAT3603 is available in a thermally enhanced low profile 5x5x0.8mm 36-pin TQFN package.


  • 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
Data Sheets AAT3603 Data Sheet AAT3603_202211B.pdf (3911 KB)
Designer Info AAT3603 Block Diagram AATI_BD_221.jpg (55 KB)
Designer Info AAT3603 Gerber File AATI_Gerber_221.zip (92 KB)
ProductName : AAT3603
Battery Charger Type : Linear
Number of Step-up Switching Regulators : 0
Number of Step-down Switching Regulators : 1
Number of LDO Regulators : 5
Min. VIN (V) : 4.5
Max. Regulator VIN (V) : 6
Max Charger VIN (V) : 6
Max Charger Protected VIN (V) : N/A
Max. Charge Current (mA) : 1440
Max. Single/ Channel Output Current (mA) : 300
Min. Single/ Ch Output Voltage (V) : 1.8
Max Step-up Output Voltage (V) : N/A
Output Voltage Control : I²C/Fixed
Operating Frequency (kHz) : 1500
Package (mm) : TQFN 36L, 5 x 5 x 0.8
Product Information:
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