BQ24259RGER

The bq24259 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. The I²C serial interface with charging and system settings makes the device a truly flexible solution. The device supports 3.9 V – 6.2 V USB input sources, including standard USB host port and USB charging port with 6.4 V overvoltage protection. The device supports USB 2.0 and USB 3.0 power specifications with input current and voltage regulation. To set the default input current limit, the bq24259 takes the result from the detection circuit in the system, such as USB PHY device. The device also supports USB On-the-Go operation by providing fast startup and supplying adjustable voltage 4.55 V – 5.5 V (default 5 V) on the VBUS with an accurate current limit up to 1.5 A. The power path management regulates the system slightly above battery voltage but does not drop below 3.5 V minimum system voltage (programmable). With this feature, the system keeps operating even when the battery is completely depleted or removed. When the input source current or voltage limit is reached, the power path management automatically reduces the charge current to zero and then starts discharges the battery until the system power requirement is met. This supplement mode operation keeps the input source from getting overloaded. The device initiates and completes a charging cycle when host control is not available. It automatically charges the battery in three phases: pre-conditioning, constant current and constant voltage. In the end, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. Later on, when the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle.

Applications

• Tablet PC
• Smart Phone
• Internet Devices
• Portable Audio Speaker

Key features

• 90% High Efficiency Switch Mode 2-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
• USB OTG with Adjustable output 4.55 V to 5.5 V at 1 A or 1.5 A
• Fast OTG Startup (22 ms Typical)
• 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
• 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
• 4-mm x 4-mm VQFN-24 Package