The bq25895 is a highly-integrated 5-Aswitch-mode battery charge management and system power path management device for single cellLi-Ion and Li-polymer battery. The devices support high input voltage fast charging. The lowimpedance power path optimizes switch-mode operation efficiency, reduces battery charging time andextends battery life during discharging phase.
The I2C Serial interface with charging and system settingsmakes the device a truly flexible solution.
The device supports a wide range of input sources, including standard USB host port, USBcharging port, and USB compliant adjustable high voltage adapter. To support fast charging usingadjustable high voltage adapter, the bq25895 provides supportMaxChargeTM using D+/D– pins and DSEL pin for USB switch control. Inaddition, the device includes interface to support adjustable high voltage adapter using inputcurrent pulse protocol. To set the default input current limit, device uses the built-in USBinterface. The device is compliant with USB 2.0 and USB 3.0 power spec with input current andvoltage regulation. In addition, the Input Current Optimizer (ICO) supports the detection ofmaximum power point detection of the input source without overload. The device supports batteryboost operation by supplying adjustable 4.5 V to 5.5 V on PMID pin with up to 3.1 A with integratedcharge and boost mode detection
Feature
- High Efficiency 5-A, 1.5-MHz Switch Mode Buck Charge
- 93% Charge Efficiency at 2 A and 91% Charge Efficiency at 3 A Charge Current
- Optimize for High Voltage Input (9 V to 12 V)
- Low Power PFM mode for Light Load Operations
- Boost Mode Operation with Adjustable Output from 4.5 V to 5.5 V
- Selectable 500-KHz to 1.5-MHz Boost Converter with up to 3.1-A Output
- 93% Boost Efficiency at 5 V at 1 A Output
- Integrated Control to Switch Between Charge and Boost Mode
- Single Input to Support USB Input and Adjustable High Voltage Adapters
- Support 3.9-V to 14-V Input Voltage Range
- Input Current Limit (100 mA to 3.25 A with 50-mA resolution) to Support USB2.0, USB3.0 standard and High Voltage Adapters
- Maximum Power Tracking by Input Voltage Limit up-to 14V for Wide Range of Adapters
- Auto Detect USB SDP, CDP, DCP, and Non-standard Adapters
- Input Current Optimizer (ICO) to Maximize Input Power without Overloading Adapters
- Resistance Compensation (IRCOMP) from Charger Output to Cell Terminal
- Highest Battery Discharge Efficiency with 11-mΩ Battery Discharge MOSFET up to 9 A
- Integrated ADC for System Monitor
(Voltage, Temperature, Charge Current) - Narrow VDC (NVDC) Power Path Management
- Instant-on Works with No Battery or Deeply Discharged Battery
- Ideal Diode Operation in Battery Supplement Mode
- BATFET Control to Support Ship Mode, Wake Up, and Full System Reset
- Flexible Autonomous and I2C Mode for Optimal System Performance
- High Integration includes all MOSFETs, Current Sensing and Loop Compensation
- 12-μA Low Battery Leakage Current to Support Ship Mode
- High Accuracy
- ±0.5% Charge Voltage Regulation
- ±5% Charge Current Regulation
- ±7.5% Input Current Regulation
- Safety
- Battery Temperature Sensing for Charge and Boost Mode
- Thermal Regulation and Thermal Shutdown
- Create a Custom Design Using the bq25895 With the WEBENCH Power Designer
