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Compact 7 Channel Regulator with Li+/Polymer Linear Battery Charger and I2C Interface

The AAT3608 is a member of AnalogicTech’s Total PowerManagement IC™ (TPMIC™) product family. It contains a single-cell lithium ion/polymer battery charger, two 800mA switching regulators and five low dropout (LDO) regulators in a small Pb-free 40-pin 5mm x 5mm TQFN package, making it ideal for portable space-constraint systems.

The single input linear charger powers up from an adapter or a USB port. Charge current is programmable with an external resistor when using an adapter and selectable between 100mA and 500mA with a pin when charging from a USB host. It integrates a load switch for dynamic power path and sleep mode operation.

The step-down regulators are monolithic synchronous converters, integrating compensation network and soft start circuitry, to limit the number of external components. Featuring 95% efficiency, the two converters operate at 1.5MHz and use each a tiny 2.2µH inductor and a small 4.7µF output capacitor.  The output voltage of the first switching converter is externally programmable with external resistors and the output of the second is adjustable with I2C.

5 channel LDO regulators with different current outputs from 300mA to 50mA feature an excellent transient response of 1.5% maximum typical and very good accuracy of 3% overall. 300mA-LDO1’s output voltage is dynamically adjustable with two digital inputs. 80mA-LDO3 is dynamically adjustable with I2C. All other LDOs have fixed output voltages.

AAT3608 is a safe solution featuring digital thermal loop to prevent charger from overheating, and over-temperature and over-current protection for the regulators. In addition the charger includes a safety timer and battery temperature sensing. The device is rated over a temperature range of -40°C to 85°C.


  • 2.7V to 5.5V Operating Input Voltage Range
  • 800mA Single Input Linear Charger
  • Adapter or USB input
  • Input Load Switch for Dynamic Path
  • Digital Thermal Regulation
  • Battery Preconditioning
  • Low Battery Voltage Fag
  • Externally Programmable Timer
  • Temperature Battery Monitoring
  • Dual 800mA Monolithic Switching Converters
  • 1.5MHz Switching Frequency
  • 95% Efficiency
  • Independent Input Power and Ground
  • Buck1 Output is Adjustable with External Resistors
  • Buck2 Output is Adjustable with I2C between  1.0V and 1.4V
  • 5 Channel LDO Regulators
  • 3% Accuracy
  • 1.5% Typical Transient Accuracy
  • LDO3’s Output is Adjustable with I2C between 0.8V and 1.4V
  • Very Low Shutdown Current
  • Power-On Push Button and GPIOs
  • Interrupt Reset and Status Pins
  • Separate Enable for Buck2 and LDO2
  • Over-Current and Over-temperature Protection
  • 5mm x 5mm, 40-Pin TQFN Package
Data Sheets AAT3608 Data Sheet 202214A.pdf (5199 KB)
Designer Info AAT3608 Block Diagram AATI_BD_345.jpg (474 KB)
ProductName : AAT3608
Battery Charger Type : Linear
Number of Step-up Switching Regulators : N/A
Number of Step-down Switching Regulators : 2
Number of LDO Regulators : 5
Min. VIN (V) : 2.7
Max. Regulator VIN (V) : N/A
Max Charger VIN (V) : 5.5
Max Charger Protected VIN (V) : N/A
Max. Charge Current (mA) : 1200
Max. Single/ Channel Output Current (mA) : 800/800/300/80/80/50/50
Min. Single/ Ch Output Voltage (V) : 0.6
Max Step-up Output Voltage (V) : N/A
Output Voltage Control : I2C/ Enables/ GPIO
Operating Frequency (kHz) : 1500
Package (mm) : TQFN 40L, 5 x 5 x 0.75
Product Information:
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