BQ24295RGER

1. FEATURES

• 90% High Efficiency Switch Mode 3A Charger

• 3.9V-6.2V Single Input USB-compliant Charger with 6.4V Over-Voltage Protection

– USB Host or Charging Port D+/D- Detection Compatible to USB Battery Charger Spec (BC1.2)

– Support Non-standard 2A/1A Adapters detection

– Input voltage and current limit supports USB2.0 and USB 3.0

– Input Current Limit: 100mA, 150mA, 500mA, 900mA, 1A, 1.5A, 2A, and 3A

• Synchronous Boost Converter in Battery Boost Mode with

– Adjustable Output 4.55V-5.5V@1.5A

– 90% 5.1V Boost Mode Efficiency

– Fast OTG Startup (22ms typ.)

• Narrow VDC (NVDC) Power Path Management

– Instant System On with No Battery or Deeply Discharged Battery

– Ideal Diode Operation in Battery Supplement Mode

• 1.5MHz Switching Frequency for Low Profile 1.2mm 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 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 Boost 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

• 20µA Low Battery Leakage Current and Support Shipping Mode

• 4mm x 4mm QFN-24 Package

2. APPLICATIONS

• Power Bank for Smartphone, Tablet

• Portable Media Players

• Internet Devices

3. DESCRIPTION

The bq24295 is a highly-integrated switch-mode battery charge management and system power path management devices for 1 cell Li-Ion and Li-polymer battery in a wide range of power bank, tablet and other portable device 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 a 3.9V-6.2V USB input sources, including standard USB host port and USB charging port with 6.4V over-voltage protection. The bq24295 is compliant with USB 2.0 and USB 3.0 power specifications with

input current and voltage regulation. To set the default input current limit, the bq24295 detects the input source through D+/D- detection following the USB battery charging spec 1.2. In addition, the bq24295 detects nonstandard 2A/1A adapters. The bq24295 supports battery boost operation by supplying adjustable voltage 4.55-5.5V (default 5.1V) on PMID pin with minimum current of 1.5A.

The devices provide various safety features for battery charging and system operation, including negative thermistor monitoring, charging safety timer and over-voltage/over-current protections. The thermal regulation reduces charge current when the junction temperature exceeds 120°C (programmable).

The STAT output reports the charging status and any fault conditions. The INT immediately notifies the host when a fault occurs.

The bq24295 is available in a 24-pin, 4x4 mm2 thin QFN package.

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