1 Features
• 90% High Efficiency Switch Mode 3-A Charger
• 3.9-V to 6.2-V Single Input USB-Compliant
Charger with 6.4-V Over-Voltage Protection
– Input voltage and current limit supports USB
2.0 and USB 3.0
– Input Current Limit: 100 mA, 150 mA, 500 mA,
900 mA, 1 A, 1.5 A, 2 A, and 3 A
• USB OTG with Adjustable output 4.55 V to 5.5 V
at 1 A or 1.5 A
– Fast OTG Startup (22 ms Typ)
– 90% 5-V Boost Mode Efficiency
– Accurate ±15% Hiccup Mode Overcurrent
Protection
• Narrow VDC (NVDC) Power Path Management
– Instant System On with No Battery or Deeply
Discharged Battery
– Ideal Diode Operation in Battery Supplement
Mode
• 1.5-MHz Switching Frequency for Low Profile 1.2-
mm Inductor
• I2C port for optimal system performance and
status reporting
• Autonomous Battery Charging with or without
Host Management
– Battery Charge Enable
– Battery Charge Preconditioning
– Charge Termination and Recharge
• High Accuracy
– ±0.5% Charge Voltage Regulation
– ±7% Charge Current Regulation
– ±7.5% Input Current Regulation
– ±3% Output Voltage Regulation in USB OTG
Boost Mode
• High Integration
– Power Path Management
– Synchronous Switching MOSFETs
– Integrated Current Sensing
– Bootstrap Diode
– Internal Loop Compensation
• Safety
– Battery Temperature Sensing for Charging and
Discharging in OTG Mode
– Battery Charging Safety Timer
– Thermal Regulation and Thermal Shutdown
– Input and System Over-Voltage Protection
– MOSFET Over-Current Protection
• Charge Status Outputs for LED or Host Processor
• Maximum power tracking capability by input
voltage regulation
• 20-μA Low Battery Leakage Current and Support
Shipping Mode and System Reset
• I2C Forced BATFET Off with Delay (9 s Typ)
• 4.00-mm x 4.00-mm WQFN-24 Package

2 Applications
• Tablet PC, Smart Phone, Internet Devices
• Portable Audio Speaker

3 Description
The bq24298 is a highly-integrated switch-mode
battery charge management and system power path
management device for 1 cell Li-Ion and Li-polymer
battery in a wide range of smart phone and tablet
applications. Its low impedance power path optimizes
switch-mode operation efficiency, reduces battery
charging time and extends battery life during
discharging phase.