SLUS763D July   2007  – April 2016

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power Down
      2. 7.3.2 Power-On Reset
      3. 7.3.3 Operation
        1. 7.3.3.1 Input Overvoltage Protection
        2. 7.3.3.2 Input Overcurrent Protection
        3. 7.3.3.3 Battery Overvoltage Protection
        4. 7.3.3.4 Thermal Protection
        5. 7.3.3.5 Enable Function
        6. 7.3.3.6 Fault Indication
    4. 7.4 Device Functional Modes
      1. 7.4.1 OPERATION Mode
      2. 7.4.2 POWER-DOWN Mode
      3. 7.4.3 POWER-ON RESET Mode
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Selection of RBAT
        2. 8.2.2.2 Selection of RCE, RFAULT, and RPU
        3. 8.2.2.3 Selection of Input and Output Bypass Capacitors
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Powering Accessories
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DSG|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9 Power Supply Recommendations

9.1 Powering Accessories

In some applications, the equipment that the protection IC resides in may be required to provide power to an accessory (for example, a cellphone may power a headset or an external memory card) through the same connector pins that are used by the adapter for charging. Figure 24 and Figure 25 illustrate typical charging and accessory-powering scenarios:

bq24314 bq24316 chg_flow_lus763.gif Figure 24. Charging – the Red Arrows Show the Direction of Current Flow
bq24314 bq24316 pwr_accs_lus763.gif Figure 25. Powering an Accessory – the Red Arrows Show the Direction of Current Flow

In the second case, when power is being delivered to an accessory, the bq24314 and bq24316 devices are required to support current flow from the OUT pin to the IN pin.

If VOUT > VUVLO + 0.7 V, FET Q1 is turned on, and the reverse current does not flow through the diode but through Q1 (see Figure 26). Q1 will then remain ON as long as VOUT > VUVLO – VHYS-UVLO + RDSON × IACCESSORY. Within this voltage range, the reverse current capability is the same as the forward capability, 1.5 A.

NOTE

There is no overcurrent protection in this direction.
bq24314 bq24316 support_lus763.gif Figure 26. Powering an Accessory – Internal Power Path