AW32257FCR

AW32257 is a high efficiency, large current，switchmode 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 highimpedance 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. AW32257 is a highly efficient, highly integrated synchronous switch charger. It has a wide range of output regulation voltage and can provide maximum 2.5A current for single-cell lithium ion or lithium polymer battery. Furthermore, AW32257 also supports boost mode for USB OTG applications. The AW32257 has three operation mode: • Charge mode: charges a single-cell battery with default or host configured value. • Boost mode: boosts the battery voltage to 5.05V(default value) on VBUS pin for OTG applications. • High impedance mode: stops charging or boosting and operates in a low power cost mode. The IC starts in charge mode, which is the default mode and using each register's default value, also, it can convert smoothly among the different modes through |2C communication by the host.

Applications

• Mobile and Smart Phones
• Digital Camera
• Gaming Device
• Other Handheld Devices

Key features

• High-Accuracy Voltage and Current Regulation
• Charge Voltage Regulation Accuracy: ±0.5%(25°C), ±1% (0°C to 85°C)
• Charge Current Accuracy: ±5%
• Power Up System without Battery
• Programmable Charge Parameters through I2C compatible Interface(100kHz/400kHz):
• VIN DPM Threshold
• Fast-Charge Current
• Charge Regulation Voltage(3.5V to 4.5V)
• Smart Charge Termination Algorithm
• 2.5A Charge Current using 33mΩ Sensing Resistor
• Specific K-DPMTM: VBUS Based Dynamic Power Management
• Up to 94% Charge Efficiency
• 20V Absolute Maximum VBUS Rating
• Trickle-CC-CV Three-stage Automatic Charging Process, Automatic Recharge
• Bad Adaptor Detection and Battery Removing Detection
• Strong Robust Protection: VBUS OVP, Minimum VBUS during Charging, Battery OVP, Reverse Leakage Protection, Thermal Shutdown
• Charge Status and Fault Indication
• 5.05V,1A Boost Mode Operation for USB OTG for 3.5V to 4.5V Battery Input
• FCQFN 2.0mm×2.0mm×0.55mm-20L Package