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TPS61176

  

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Part NameTPS61176 Texas-Instruments
Texas Instruments Texas-Instruments
DescriptionHigh-Efficiency 6-Channel WLED Driver Supporting Single-Cell Li-Ion Battery Input
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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.

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

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

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