SLUSBD1B MARCH   2013  – September 2016

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Pin Configuration and Function
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 SMBus Timing Characteristics
    8. 5.8 Typical Characteristics
  6. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Switching Frequency Adjust
      2. 6.3.2  High Accuracy Current Sense Amplifiers
      3. 6.3.3  Charger Timeout
      4. 6.3.4  Input Over-Current Protection (ACOC)
      5. 6.3.5  Converter Over-Current Protection
      6. 6.3.6  Battery Over-Voltage Protection (BATOVP)
      7. 6.3.7  System Over-Voltage Protection (SYSOVP)
      8. 6.3.8  Thermal Shutdown Protection (TSHUT)
      9. 6.3.9  Adapter Over-Voltage Protection (ACOVP)
      10. 6.3.10 Adapter Detect and ACOK Output
      11. 6.3.11 ACFET/RBFET Control
      12. 6.3.12 DPM
      13. 6.3.13 Buck Converter Power up
    4. 6.4 Device Functional Modes
      1. 6.4.1 LDO Mode and Minimum System Voltage
      2. 6.4.2 PWM Mode Converter Operation
      3. 6.4.3 Continuous Conduction Mode (CCM)
      4. 6.4.4 Discontinuous Conduction Mode (DCM)
      5. 6.4.5 PFM Mode
      6. 6.4.6 Learn Mode
      7. 6.4.7 IDPM Disable at Battery Removal
    5. 6.5 Programming
      1. 6.5.1 SMBus Communication
        1. 6.5.1.1 SMBus Interface
          1. 6.5.1.1.1 Write-Word Format
          2. 6.5.1.1.2 Read-Word Format
        2. 6.5.1.2 SMBus Commands
        3. 6.5.1.3 Setting Charger Options
        4. 6.5.1.4 Setting the Charge Current
        5. 6.5.1.5 Setting the Max Charge Voltage
        6. 6.5.1.6 Setting the Minimum System Voltage
        7. 6.5.1.7 Setting Input Current
  7. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Inductor Selection
        2. 7.2.2.2 Input Capacitor
        3. 7.2.2.3 Output Capacitor
        4. 7.2.2.4 Power MOSFETs Selection
        5. 7.2.2.5 Input Filter Design
      3. 7.2.3 Application Curves
  8. 8 Power Supply Recommendations
  9. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Third-Party Products Disclaimer
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Community Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

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8 Power Supply Recommendations

When adapter is attached, and ACOK goes HIGH, the system is connected to adapter through ACFET/RBFET. An external resistor voltage divider attenuates the adapter voltage before it goes to ACDET. The adapter detect threshold should typically be programmed to a value greater than the maximum battery voltage, but lower than the IC maximum allowed input voltage (ACOVP) and system maximum allowed voltage.

When adapter is removed, the system is connected to battery through BATFET. Typically the battery depletion threshold should be greater than the minimum system voltage so that the battery capacity can be fully utilized for maximum battery life.