SLUSCD6 April   2016


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
    8. 7.8 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input Overvoltage Protection
      2. 8.3.2 Undervoltage Lockout (UVLO)
      3. 8.3.3 External NTC Monitoring (TS)
      4. 8.3.4 50-mA LDO (LDO)
      5. 8.3.5 Charge Status Indicator (CHG)
      6. 8.3.6 Input Current Limit Control (EN)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Charging Operation
        1. Charger Operation with Minimum System Voltage Mode Enabled
        2. Precharge Mode (V(BAT) ≤ V(LOWV))
        3. Fast Charge Mode
      2. 8.4.2 Programmable Input Current Limit (ISET)
      3. 8.4.3 Sleep Mode
      4. 8.4.4 Thermal Regulation and Thermal Shutdown
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. Selection of Input and Output Capacitors
        2. Thermal Considerations
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DQC|10
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C5
  • Single Cell LiFePO4 Charging Algorithm
  • 30-V Input Rating, With 10.5-V Overvoltage Protection (OVP)
  • 50-mA Integrated Low Dropout Linear Regulator (LDO)
  • Programmable Charge Current Through ISET and EN Terminals
  • Thermal Regulation and Protection
  • Soft-Start Feature to Reduce Inrush Current
  • Battery NTC Monitoring
  • Charging Status Indication
  • 10-Pin SON (2mm x 3mm) Package with Wettable Flanks

2 Applications

  • E-call for Cars
  • Automotive Telematics
  • Vehicle GPS Tracking
  • Car Network Video Recorder
  • Smart Key
  • Automotive Entertainment backup battery

3 Description

The bq25071-Q1 is a highly integrated, linear, LiFePO4 battery charger targeted at space-limited automotive applications. It accepts power from either a USB port or AC adapter and charges a single-cell LiFePO4 battery with up to 1 A of charge current. The 30-V input rating supports low-cost unregulated adapters.

The bq25071-Q1 has a single power output that simultaneously charges the battery and powers the system. The input current is programmable from 100 mA up to 1 A using the ISET input or configurable for USB500. There is also a 4.9 V ±10% 50 mA LDO integrated into the IC for supplying low power external circuitry.

The LiFePO4 charging algorithm removes the current taper typically seen as part of the constant voltage mode control used in Li-Ion battery charge cycles which reduces charge time significantly. Instead, the battery is fast charged to the overcharge voltage and then allowed to relax to a lower float charge voltage threshold. The charger integrates the power stage with the charge current and voltage sense to achieve a high level of accuracy in the current and voltage regulation loops. An internal control loop monitors the IC junction temperature through the charge cycle and reduces the charge current if an internal temperature threshold is exceeded.

Device Information (1)

bq25071-Q1 WSON (10) 2.00 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Application Schematic

bq25071-Q1 fp_app_sch_sluscd6.gif