TPS61180 Datasheet, PDF (1/26 Pages) Texas Instruments – WLED DRIVER FOR NOTEBOOK DISPLAY

www.ti.com
TPS61180/1/2
SLVS801A – DECEMBER 2007 – REVISED MARCH 2008
WLED DRIVER FOR NOTEBOOK DISPLAY
FEATURES
1
• 5 V to 24 V Input Voltage
• Integrated 1.5 A 40 V MOSFET
• 1.0 MHz/1.3 MHz Switching Frequency
• Boost Output Auto-Adaptive to WLED Voltages
• Small External Components
• Integrated Loop Compensation
• Six Current Sink of 25 mA
• Up to 10 WLED in Series
• Less Than 3% Current Matching and Accuracy
• 100:1 PWM Brightness Dimming Range
• Minimized Output Ripple Under PWM Dimming
• Driver for Input/Output Isolation PFET
• True Shutdown
• Over Voltage Protection
• WLED Open/Short Protection
• Built-in Soft Start
• 16L 3 mm×3 mm QFN
APPLICATIONS
• Notebook LCD Display Backlight
• UMPC LCD Display Backlight
• Backlight for Media Form Factor LCD display
DESCRIPTION
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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2008, Texas Instruments Incorporated