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
  • USB Host or Charging Port D+/D- Detection Compatible to USB Battery Charger Spec (BC1.2)
  • Support Non-Standard 2-A/1-A Adapters Detection
  • Input Voltage and Current Limit Supports USB2.0 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
• Synchronous Boost Converter in Battery Boost Mode with
  • Adjustable Output 4.55 V – 5.5 V at 1.5 A
  • 90% 5.1-V Boost Mode Efficiency
  • Fast OTG Startup (22 ms Typ)
• Narrow VDC (NVDC) Power Path Management
  • Instant System On with No Battery or Deeply Discharged Battery
  • Ideal Diode Operation in Battery Supplement Mode
• 1.5-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 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
• 20-µA Low Battery Leakage Current and Support Shipping Mode
• 4mm x 4mm VQFN-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.

1. For all available packages, see the orderable addendum at the end of the datasheet.

bq24295 with USB D+/D- Detection for Charging and Discharging in Boost Mode

4 Revision History

Changes from A Revision (January 2015) to B Revision

• Deleted last two sentences in Power-On-Reset (POR) Go
• Changed VREF to V_REGN in Figure 18 Go
• Changed 20°C to –20°C and VREF to V_REGN in Figure 19 Go
• Changed Equation 1 Go
• Changed 58 to 0x58 in Input Source Control Register REG00 [reset = 01011000, or 0x58]58 to 0x58 in heading headingGo
• Changed 00011011 to 00111011 and 0x1B to 0x3B in Power-On Configuration Register REG01 [reset = 0011101100011011 to 00111011 and 0x1B to 0x3B in heading, or 0x3B] headingGo
• Changed Bit 6 RESET from 1 to 0 in Table 9 Go
• Changed Bit 3 RESET from 1 to 0 in Table 11 Go
• Changed Bit 2 RESET from 1 to 0 in Table 11 Go
• Changed 4B to 0x4B in Misc Operation Control Register REG07 [reset = 01001011, or 0x4B4B to 0x4B in heading ] heading Go
• Changed D+/D– to input source in Table 14 Go
• Changed last paragraph in Output Capacitor sectionGo

Changes from * Revision (September 2013) to A Revision

• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go
• Changed 5.52kΩ to 5.25kΩ in bq24295 with USB D+/D- Detection for Charging and Discharging in Boost Mode Go
• Changed Power Pad to Thermal Pad throughout data sheetGo
• Changed REG01[5] to REG01[5] = 1 in OTG descriptionGo
• Added (10k NTC thermistor only) to QON descriptionGo
• Changed I_CHG = 1792 mA in I_{ICHG_REG_ACC} test conditionsGo
• Changed falling to rising and TYP to 47.2% in V_HTF in Electrical CharacteristicsGo
• Added V_{IH_OTG} to Electrical CharacteristicsGo
• Deleted wavefroms from Typical Characteristics and added to Application Performance PlotsGo
• Changed Table 3 Go
• Added paragraph after Table 3Go
• Changed Figure 15 Go
• Changed from 2048 mA to 1024 mA in Table 5Go
• Changed RT1 = 5.25 kΩ Go
• Deleted and LSFET from Voltage and Current Monitoring in Buck Mode descriptionGo
• Changed REG09[5] to REG09[3] in Battery Over-Voltage Protection (BATOVP) sectionGo
• Changed reset = 01100000, or 60 to reset = 00100000, or 0x20 for REG02Go
• Changed Default: 2048 mA (011000) to Default: 1024mA (001000) for bits [7:2] in REG02Go
• Changed reset = 10011010, or 0x9A to reset = 10011100, or 0x9C for REG05Go
• Changed 0 to 1 for REG05 Bit 2 Reset Go
• Changed 1 to 0 for REG05 Bit 1 ResetGo
• Changed REG09 Bit 3 description 1 – Battery OVP Go
• Changed paragraph in Application Information Go
• Changed 5.52kΩ to 5.25kΩ in Figure 40 Go