SLUSB80E September   2012  – January 2018

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (Continued)
  6. 6 Device Comparisons
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagrams
    3. 9.3 Operational Flow Chart
    4. 9.4 Feature Description
      1. 9.4.1 Input Voltage Protection
        1. 9.4.1.1 Input Overvoltage Protection
        2. 9.4.1.2 Bad Adaptor Detection/Rejection
        3. 9.4.1.3 Sleep Mode
        4. 9.4.1.4 Input Voltage Based DPM (Special Charger Voltage Threshold)
      2. 9.4.2 Battery Protection
        1. 9.4.2.1 Output Overvoltage Protection
        2. 9.4.2.2 Battery Detection at Power Up in DEFAULT Mode
        3. 9.4.2.3 Battery Short Protection
        4. 9.4.2.4 Battery Detection in Host Mode
      3. 9.4.3 DEFAULT Mode
      4. 9.4.4 USB Friendly Power Up
      5. 9.4.5 Input Current Limiting At Power Up
    5. 9.5 Device Functional Modes
      1. 9.5.1 Charge Mode Operation
        1. 9.5.1.1 Charge Profile
      2. 9.5.2 PWM Controller in Charge Mode
      3. 9.5.3 Battery Charging Process
      4. 9.5.4 Thermal Regulation and Protection
      5. 9.5.5 Charge Status Output, STAT Pin
      6. 9.5.6 Control Bits in Charge Mode
        1. 9.5.6.1 CE Bit (Charge Mode)
        2. 9.5.6.2 RESET Bit
        3. 9.5.6.3 OPA_Mode Bit
      7. 9.5.7 Control Pins in Charge Mode
        1. 9.5.7.1 CD Pin (Charge Disable)
      8. 9.5.8 BOOST Mode Operation
        1. 9.5.8.1 PWM Controller in Boost Mode
        2. 9.5.8.2 Boost Start Up
        3. 9.5.8.3 PFM Mode at Light Load
        4. 9.5.8.4 Protection in Boost Mode
          1. 9.5.8.4.1 Output Overvoltage Protection
          2. 9.5.8.4.2 Output Overload Protection
          3. 9.5.8.4.3 Battery Overvoltage Protection
        5. 9.5.8.5 STAT Pin in Boost Mode
      9. 9.5.9 High Impedance (Hi-Z) Mode
    6. 9.6 Programming
      1. 9.6.1 Serial Interface Description
        1. 9.6.1.1 F/S Mode Protocol
        2. 9.6.1.2 H/S Mode Protocol
        3. 9.6.1.3 I2C Update Sequence
        4. 9.6.1.4 Slave Address Byte
        5. 9.6.1.5 Register Address Byte
    7. 9.7 Register Description
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Typical Application
        1. 10.1.1.1 Design Requirements
        2. 10.1.1.2 Detailed Design Procedure
      2. 10.1.2 Charge Current Sensing Resistor Selection Guidelines
      3. 10.1.3 Output Inductor and Capacitance Selection Guidelines
    2. 10.2 Typical Performance Curves
  11. 11Power Supply Recommendations
    1. 11.1 System Load After Sensing Resistor
      1. 11.1.1 The Advantages:
      2. 11.1.2 Design Requirements and Potential Issues:
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information
    1. 14.1 Package Summary
      1. 14.1.1 Chip Scale Packaging Dimensions

Package Options

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

1 Features

  • Power Up System without Battery
  • Charge Faster than Linear Chargers
  • High-Accuracy Voltage and Current Regulation
    • Input Current Regulation Accuracy: ±5% (100 mA and 500 mA)
    • Charge Voltage Regulation Accuracy: ±0.5% (25°C), ±1% (0°C to 125°C)
    • Charge Current Regulation Accuracy: ±5%
  • Input Voltage Based Dynamic Power Management (VIN DPM)
  • Bad Adaptor Detection and Rejection
  • Safety Limit Register for Maximum Charge Voltage and Current Limiting
  • High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs
  • 20-V Absolute Maximum Input Voltage Rating
  • 6.5-V Maximum Operating Input Voltage
  • Built-In Input Current Sensing and Limiting
  • Integrated Power FETs for Up To 1.55-A Charge Rate
  • Programmable Charge Parameters through I2C™ Compatible Interface (up to 3.4 Mbps):
    • Input Current Limit
    • VIN DPM Threshold
    • Fast-Charge/Termination Current
    • Charge Regulation Voltage (3.5 V to 4.44 V)
    • Low Charge Current Mode Enable/Disable
    • Termination Enable/Disable
  • Support up to 1.55A Charge Current using 55 mΩ Sensing Resistor
  • Synchronous Fixed-Frequency PWM Controller Operating at 3 MHz With 0% to 99.5% Duty Cycle
  • Automatic High Impedance Mode for Low Power Consumption
  • Robust Protection
    • Reverse Leakage Protection Prevents Battery Drainage
    • Thermal Regulation and Protection
    • Input/Output Overvoltage Protection
  • Status Output for Charging and Faults
  • USB Friendly Boot-Up Sequence
  • Automatic Charging
  • Boost Mode Operation for USB OTG
    • Input Voltage Range (from Battery): 3.2 V to 4.5 V
  • 2.1 mm x 2 mm 20-Pin WCSP Package

2 Applications

  • Mobile and Smart Phones
  • MP3 Players
  • Handheld Devices

3 Description

The bq24157 is a compact, flexible, high-efficiency, USB-friendly switch-mode charge management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The charge parameters can be programmed through an I2C interface. The IC integrates a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq24157 WCSP (20-Pin) 2.1 mm x 2.0 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application Circuit

bq24157 app_cir_fp_lusb80.gif

4 Revision History

Changes from D Revision (July 2016) to E Revision

  • Changed Output voltage (with respect to PGND) - SW MIN value From: –0.7 To: –2 in the Absolute Maximum RatingsGo
  • Deleted graphs "Cycle by Cycle Current Limiting in Charge Mode" and "PWM Charging Waveform" from the Typical CharacteristicsGo
  • Deleted list item "Default charge current will be 550 mA, if 68-mΩ sensing resistor is used, since default LOW_CHG = 0." following Table 8Go

Changes from B Revision (October 2013) to C Revision

Changes from A Revision (March 2013) to B Revision

  • Changed Table 8 Memory location: 05, Bit B5 Function description from "....(default 0)" to ".....(default 1)Go

Changes from * Revision (September 2012) to A Revision

  • Deleted capacitor CO2 from the Typical Application Circuit Go
  • Deleted capacitor CO2 from Figure 23 Go