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FEATURES

APPLICATIONS

DESCRIPTION

TPS61180/1/2

SLVS801A – DECEMBER 2007 – REVISED MARCH 2008

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WLED DRIVER FOR NOTEBOOK DISPLAY

• 5 V to 24 V Input Voltage

• True Shutdown

• Integrated 1.5 A 40 V MOSFET

• Over Voltage Protection

• 1.0 MHz/1.3 MHz Switching Frequency

• WLED Open/Short Protection

• Boost Output Auto-Adaptive to WLED Voltages

• Built-in Soft Start

• Small External Components

• 16L 3 mm×3 mm QFN

• Integrated Loop Compensation

• Six Current Sink of 25 mA

• Notebook LCD Display Backlight

• Up to 10 WLED in Series

• UMPC LCD Display Backlight

• Less Than 3% Current Matching and Accuracy

• Backlight for Media Form Factor LCD display

• 100:1 PWM Brightness Dimming Range

• Minimized Output Ripple Under PWM Dimming

• Driver for Input/Output Isolation PFET

The TPS61180/1/2 ICs provide highly integrated solutions for media size LCD backlight. These devices have a

built-in high efficiency boost regulator with integrated 1.5A/40V power MOSFET. The six current sink regulators

provide high precision current regulation and matching. In total, the device can support up to 60 WLED. In

addition, the boost output automatically adjusts its voltage to the WLED forward voltage to improve efficiency.

The devices support pulse width modulation (PWM) brightness dimming. During dimming, the WLED current is

turned on/off at the duty cycle and frequency determined by the PWM signal input on the DCRTL pin. One

potential issue of PWM dimming is audible noises from the output ceramic capacitors. The TPS61180/1/2 family

is designed to minimize this output AC ripple across a wide dimming duty cycle and frequency range; and,

therefore reduce the audible noise.

The TPS61180/1/2 ICs provide a driver output for an external PFET connected between the input and inductor.

During short circuit or over-current conditions, the ICs turn off the external PFET and disconnect the battery from

the WLEDs. The PFET is also turned off during IC shutdown (true shutdown) to prevent any leakage current of

the battery. The device also integrates over-voltage protection, soft-start and thermal shutdown.

The TPS61180 IC requires external 3.3V IC supply, while TPS61181 and TPS61182 ICs have a built-in linear

regulator for the IC supply. All the devices are in a 3

×3 mm QFN package.

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.