The bq24193 is ahighly-integrated switch-mode battery charge management andsystem power path management device for singlecell Li-Ion and Li-polymer batteries in a wide range of tablet and other portable devices.
Its low impedance power path optimizes switch-mode operation efficiency, reduces batterycharging time and extends battery life during discharging phase. The I2Cserial interface with charging and system settings makes the device a truly flexiblesolution.
The device supports a wide range of input sources, including standardUSB host port, USB charging port and high power DC adapter. The bq24193 takes the result fromdetection circuit in the system, such as USB PHY device. The bq24193 is compliant with USB 2.0 andUSB 3.0 power spec with input current and voltage regulation. Meanwhile, the bq24193 meets USBOn-the-Go operation power rating specification by supplying 5 V on VBUS with current limit up to1.3 A.
The power path management regulates the system slightly above battery voltage but doesnot drop below 3.5-V minimum system voltage (programmable). With this feature, the system maintainsoperation even when the battery is completely depleted or removed. When the input current limit orvoltage limit is reached, the power path management automatically reduces the charge current tozero. As the system load continues to increase, the power path discharges the battery until thesystem power requirement is met. This supplement mode operation prevents overloading the inputsource.
The device initiates and completes a charging cycle without softwarecontrol. It automatically detects the battery voltage and charges the battery in three phases:pre-conditioning, constant current and constant voltage. At the end of the charging cycle, thecharger automatically terminates when the charge current is below a preset limit in the constantvoltage phase. When the full battery falls below the recharge threshold, the charger willautomatically start another charging cycle.
The device provide various safety features for battery charging andsystem operation, including dual pack negative thermistor monitoring, charging safety timer andover-voltage/over-current protections. The bq24193 also supports JEITA guideline complianttemperature profile. The thermal regulation reduces charge current when the junction temperatureexceeds 120°C (programmable).
The STAT output reports the charging status and any fault conditions. The PG output in the bq24193 indicatesif a good power source is present.The INT immediatelynotifies the host when a fault occurs.
Thebq24193 is available in a 24-pin, 4.00 x 4.00mm2 thin VQFN package.
Feature
- High Efficiency 4.5-A Switch Mode Charger
- 92% Charge Efficiency at 2 A, 90% at 4 A
- Accelerate Charge Time by Battery Path Impedance Compensatioin
- Highest Battery Discharge Efficiency with 12-mΩ Battery Discharge MOSFET up to 9-A Discharge Current
- Single Input USB-compliant/Adapter Charger
- USB Host or Charging Port D+/D- Detection Compatible to USB Battery Charger Spec 1.2
- Input Voltage and Current Limit Supports USB2.0 and USB3.0
- Input Current Limit: 100 mA, 150 mA, 500 mA, 900 mA, 1.2 A, 1.5 A, 2 A and 3 A
- 3.9-V to 17-V Input Operating Voltage Range
- Support All Kinds of Adapter with Input Voltage DPM Regulation
- USB OTG 5 V at 1.3 A Synchronous Boost Converter Operation
- 93% 5-V Boost Efficiency at 1 A
- Narrow VDC (NVDC) Power Path Management
- Instant-on Works with No Battery or Deeply Discharged Battery
- Ideal Diode Operation in Battery Supplement Mode
- 1.5-MHz Switching Frequency for Low Profile Inductor
- Autonomous Battery Charging with or without Host Management
- Battery Charge Enable
- Battery Charge Preconditioning
- Charge Termination and Recharge
- High Accuracy (0°C to 125°C)
- ±0.5% Charge Voltage Regulation
- ±7% Charge Current Regulation
- ±7.5% Input Current Regulation
- ±2% Output Regulation in Boost Mode
- High Integration
- Power Path Management
- Synchronous Switching MOSFETs
- Integrated Current Sensing
- Bootstrap Diode
- Internal Loop Compensation
- Safety
- Battery Temperature Sensing and Charging Safety Timer
- JEITA Guideline Compliant
- Thermal Regulation and Thermal Shutdown
- Input System Over-Voltage Protection
- MOSFET Over-Current Protection
- Charge Status Outputs for LED or Host Processor
- Low Battery Leakage Current and Support Shipping Mode
- 4.00 mm x 4.00 mm QFN-24 Package
