Total Power Solution for Micro Power Applications

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Manufacturer Skyworks


Description :

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.

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    • 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

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Features Similar products
Control scheme Current Mode Control  

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Switching frequency (kHz) 1600  
Max Input Voltage (V) 2.7 to 5.5  
Output Voltage (V) 0.6 to 5.5 (Buck Converter), 2 to 2.6 (LDO), 6 to 27 (Boost Converter)  
Typ. Active Current (µA) 25 (Bulk Converter), 1.5 (LDO), 16 (Boost Converter)  
Typ. Dropout Voltage @ Max. lout (mV) 17  
Output Capacitor Type 1 μF, Ceramic Capacitor  
Output Current (mA) 25 (Bulk Converter), 5 (LDO), 2 (Boost Converter)  
Operating Temperature (°C) -40 to +150  
Package QFN44-24