TPS61176 Texas instruments

TPS61176

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TPS61176

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Описание

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.

2.7-V to 6.5-V V_IN 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

Number of channels	6
Vin (min) (V)	2.7
Vin (max) (V)	6.5
Vout (min) (V)	2.7
Vout (max) (V)	38
Type	Inductive
Switching frequency (max) (kHz)	1000
Duty cycle (max) (%)	93
LED current per channel (mA)	35
Peak efficiency (%)	90
Topology	Boost
Operating temperature range (°C)	-40 to 85
Rating	Catalog