The RICHTEK IC is high quality!  High Efficiency 5A, 1.5MHz Switching Charger with Output Inductor DFE252012F, TOKO
Charging Efficiency 90.25% at ICHG = 2A
Charging Efficiency 88.86% at ICHG = 3A
Charging Efficiency 84.2% at ICHG = 5A
 Synchronous 1.5MHz/0.75MHz Fixed-Frequency
PWM Controller with Up to 95% Duty Cycle
 Power Path Management by BATFET Control
 Support High Voltage Input (9V/12V)
 Support High Voltage Input Adapter (Pump Express
1.0/2.0)
 Support IR Compensation Function from Charger
Output to Cell Terminal
 Optimize Input Sourcing Capability to Prevent
Overload
AICR Current Limit Setting via I2C
ILIM Pin for Current Limit Setting
Average Input Current Limit Measurement
 Shipping Mode for Battery Leakage Reduction
Wake Up System, Exit Shipping Mode, and Reset
System by QON Pin
 Automatic Charging
 Average Input Current Regulation (AICR) :
0.1A to 3.25A in 50mA Steps
 Charge Current Regulation Accuracy : ± 7%
 Charge Voltage Regulation Accuracy : ± 1% (0 to 85°C)
 Protection for Overall System Considerations
Thermal Regulation for Current Reduction and Over-Temperature Protection
Input Over-Voltage Protection
Input Bad Adapter Protection
Battery Over-Voltage Protection
 Support ADC Conversion for
VBUS, VBAT, VSYS, REGN, TS_BAT, IBUS, IBAT,TEMP_JC
 INT Output for Communication with Host Through
I
2
C (Watch Dog/Polling Function)