AW32257 is a high efficiency, large current，switch- mode Li-Ion battery charge management chip. The chip integrates 1.5 MHz synchronous Buck PWM controller, Boost PWM controller and power MOSFETs, effectively reducing the power loss.
The charge process of AW32257 includes: trickle, constant current (CC) and constant voltage (CV). The charge parameters and operating modes are programmable through I2C Interface. Also, the charge termination is determined by a programmable algorithm. The charge process runs automatically and recharging occurs when the battery voltage drops below VOREG-VRCH.
If the input source is removed, the IC enters a high-impedance mode, keeping ultra-low power loss from battery and preventing leakage from the battery to the input. Charge current is reduced when the die temperature reaches 140°C, protecting the device and PCB from damage.
The IC can operate in boost mode to support USB OTG device on command from system. The boost regulator uses same external components with charge mode, and it supports up to 1A output current for OTG device. Meanwhile, the output voltage of boost regulator can be configured from 5.05V to 5.35V by the host.
l High-Accuracy Voltageand CurrentRegulation
- Charge Voltage Regulation Accuracy: ±0.5%(25°C), ±1%(0°C to 85°C)
- Charge Current Accuracy: ±5%
l Programmable Charge Parameters through I2CTM compatible Interface(100kHz/400kHz):
-VIN DPM Threshold
-Fast-Charge Current
-Charge Regulation Voltage(3.5V to 4.5V)
-Smart Charge Termination Algorithm
l 2.5A Charge Current using 33 mΩ Sensing Resistor
l Specific K-DPMTM: VBUS Based Dynamic Power Management
l Up to 94% Charge Efficiency
l Trickle-CC-CV Three-stage Automatic Charging Process, Automatic Recharge
l Bad Adaptor Detection and Battery Removing Detection
l Strong Robust Protection: VBUS OVP, Minimum VBUS during Charging, Battery OVP, Reverse Leakage Protection, Thermal Shutdown
l Charge Status and Fault Indication
l 5.05V,1A Boost Mode Operation for USB OTG for 3.5V to 4.5V Battery Input
l FCQFN 2.0mm×2.0mm×0.55mm-20L Package
l I2C Address=0x6A
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AW32257FCR
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