SLVSBM5B December   2012  – August 2015 TPS61176

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 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 Supply Voltage
      2. 7.3.2 Boost Converter
      3. 7.3.3 Current Sinks
      4. 7.3.4 IFBx Pin Unused
      5. 7.3.5 Enable and Start-up
      6. 7.3.6 Brightness Dimming Control
    4. 7.4 Device Functional Modes
      1. 7.4.1 Dimming Modes
        1. 7.4.1.1 Analog Dimming Mode
        2. 7.4.1.2 PWM Dimming
      2. 7.4.2 Overvoltage Protection
      3. 7.4.3 Current Sink Open Protection
      4. 7.4.4 Overcurrent and Short Circuit Protection
      5. 7.4.5 Thermal Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Single-Cell Battery Input Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Inductor Selection
          2. 8.2.1.2.2 Output Capacitor Selection
          3. 8.2.1.2.3 Schottky Diode Selection
          4. 8.2.1.2.4 Isolation FET Selection
          5. 8.2.1.2.5 Audible Noise Reduction
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Multi-Cell Battery Input Application
      3. 8.2.3 Combined String Application
      4. 8.2.4 Separate PWM and EN Signals Application
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    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

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

1 Features

  • 2.7-V to 6.5-V VIN Voltage Range
  • 2.7-V to 24-V Boost Input Voltage Range
  • Integrated 2-A/40-V MOSFET
  • 1-MHz Switching Frequency
  • Adaptive Boost Output to WLED Voltages
  • Six Current Sinks of 35 mA Capability Each
  • ±2% (Maximum) Current Accuracy
  • 1.3% (Typical) Current Matching
  • 100-Hz to 22-kHz Input PWM Frequency
  • Mixed Dimming Mode: Automatic Switch Between Analog Dimming and PWM Dimming
    • Programmable Switch Point: 25% or 12.5%
    • Programmable PWM Dimming Mode: 22-kHz PWM Dimming, Direct PWM Dimming
  • Up to 14-bit Dimming Resolution
  • Support Down to 1% Dimming Duty Cycle
  • Input PWM Glitch Filter
  • Up to 90% Efficiency
  • Driver for Input and Output Isolation PFET for True Shutdown
  • Built-in WLED Open and Short Protection
  • Thermal Shutdown

2 Applications

    Backlight for Small and Media Form Factor LCD Display with Single-Cell or Multi-Cell Battery Input

3 Description

The TPS61176 is an integrated WLED backlight driver for tablets or notebook PCs using single-cell batteries. It comprises a high-efficiency boost converter with an integrated 2-A, 40-V power MOSFET, and six current sink regulators. The device can drive up to 60 WLEDs. The boost output voltage automatically adjusts to the WLED forward voltage to improve efficiency.

The TPS61176 supports mixed dimming mode. The automatic switch between PWM dimming and analog dimming increases the overall electrical-to-optical efficiency, reducing power of the backlight significantly. The switch point can be programmed to 12.5% or 25%. PWM dimming mode can also be programmed to fixed frequency dimming or direct PWM dimming. The device supports up to 14-bit dimming resolution to avoid potential flickering during low brightness dimming.

True shutdown is supported with a driver for an external isolation P-channel MOSFET. When the device is disabled or the boost output is shorted to ground, the isolation PFET is turned off to cut off the power path from battery preventing any leakage current from the battery. The device also integrates soft start, thermal shutdown, WLED open and short protection. Its 16-pin WQFN package provides a space-saving and high-performance WLED driver solution.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS61176 WQFN (16) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application

TPS61176 fp_typ_app_lvsbm5.gif