AAT3604B Buy Now
Total Power Solution for Micro Power Applications

The AAT3604B is a micropower PMU optimized for maximum lithium-ion (polymer) battery life both in operational and standby mode. The total no load current into VIN when all functions are enabled is only 70μA.

The AAT3604B is a highly integrated device which simplifies system level design for the user with minimal external components required. It contains a step-up (boost) converter, a step-down (buck) converter, an LDO regulator and a single-cell Lithium Ion/Polymer battery charger in a single PMU. The device also includes a load switch for dynamic power path/sleep mode operation for processor core voltage, making it ideal for ultra low power portable devices.

The battery charger is a complete, thermally protected constant current/constant voltage linear charger. It includes an integrated pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status indication, and charge termination. The step-up DC/DC converter is a high efficiency boost converter capable of 27V maximum output voltage. It is the ideal power solution to power OLED, LCD, and CCD applications. The step-up converter offers a true load disconnect feature which isolates the load from the power source when EN1 is pulled low. This eliminates leakage current and isolates the output while the device is disabled.

The step-down DC/DC converter is integrated with internal compensation and operates up to a switching frequency of 1.6MHz, thus minimizing the size of external components while keeping switching losses low and efficiency high.

The LDO regulator offers 60dB power supply rejection ratio (PSRR) and low noise operation, making it suitable for powering noise-sensitive loads. The AAT3604B is available in a space-saving, thermally enhanced 24-pin QFN44 package.

*Available exclusively outside of the United States and its territories.


  • VIN: 2.7V to 5.5V
  • Minimum External Components
  • Less than 1.1mm Height for all External Components
  • Total Standby Mode Ground Current 1μA(VO1, VO2, and VO3 enabled).
  • 1.8V Enable Logic
  • Core Voltage Switchover in Standby Mode
  • LDO Input Current Minimized for 5μA Typical Load
  • Buck Efficiency Optimized for 0.6mA Load
  • Separate Enable Pins for Each Supply Output
  • Over-Current Protection
  • Over-Temperature Protection
  • 24-Pin 4x4 QFN package

    Step-Up (Boost) Converter

  • 6.0 to 10V @ 2mA Output

    Step-Down (Buck) Converter

  • 0.6V to VIN @ 25mA Output

    LDO Regulator (AUX)

  • 2.0 to 2.6V/5mA @ VIN = 3.6V
  • PSRR: 60dB@100Hz
  • Noise: 175μVrms

    Battery Charger (3.0V)

  • Lithium-Ion/Polymer Battery Charger
  • Digitized Thermal Regulation
  • Charge Current Programming up to 100mA
  • Charge Current Termination Programming
  • Automatic Trickle Charge for Battery Preconditioning
  • Charge Status Indicator
Data Sheets AAT3604B Data Sheet 202213A.pdf (2031 KB)
Designer Info AAT3604B Block Diagram AATI_BD_360.jpg (72 KB)
ProductName : AAT3604B
Battery Charger Type : Linear
Number of Step-up Switching Regulators : N/A
Number of Step-down Switching Regulators : 1
Number of LDO Regulators : 1
Min. VIN (V) : 2.7
Max. Regulator VIN (V) : 4.5
Max Charger VIN (V) : 6.5
Max Charger Protected VIN (V) : N/A
Max. Charge Current (mA) : 100
Max. Single/ Channel Output Current (mA) : 25
Min. Single/ Ch Output Voltage (V) : 0.6
Max Step-up Output Voltage (V) : 27
Output Voltage Control : Enables
Operating Frequency (kHz) : 1600
Package (mm) :
Product Information:
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