1 Features

1• 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.