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TPS61180RTER
1.5A White LED Driver for Notebooks
TPS61180/1/2
www.ti.com SLVS801E –DECEMBER 2007–REVISED APRIL 2013
WLED DRIVER FOR NOTEBOOK DISPLAY
Checkfor Samples: TPS61180/1/2
1FEATURES 5Vto24V Input Voltage • Driver for Input/Output Isolation PFET Integrated 1.5A40V MOSFET • True Shutdown 1.0 MHz/1.3 MHz Switching Frequency • Over Voltage Protection Boost Output Auto-Adaptiveto WLED Voltages • WLED Open/Short Protection Small External Components • Built-in Soft Start Integrated Loop Compensation • 16L3 mm×3 mm QFN Six Current Sinkof25 mA APPLICATIONS• Upto10 WLEDin Series Notebook LCD Display Backlight• Less Than 3% Current Matching and Accuracy UMPC LCD Display Backlight• Upto 1000:1 PWM Brightness DImming Range Backlight for Media Form Factor LCD display• Minimized Output Ripple Under PWM Dimming
DESCRIPTIONThe TPS61180/1/2 ICs provide highly integrated solutions for media size LCD backlight. These devices havea
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 upto 60 WLED.In
addition, the boost output automatically adjustsits voltageto the WLED forward voltageto improve efficiency.
The devices support pulse width modulation (PWM) brightness dimming. During dimming, the WLED currentis
turned on/offat the duty cycle and frequency determined by the PWM signal input on the DCRTL pin. One
potential issueof PWM dimmingis audible noises from the output ceramic capacitors. The TPS61180/1/2 family designedto minimize this output AC ripple acrossa wide dimming duty cycle and frequency range; therefore,
reducing the audible noise.
The TPS61180/1/2 ICs providea driver output foran external PFET connected between the input and inductor.
During short circuitor over-current conditions, the ICs turnoff the external PFET and disconnect the battery from
the WLEDs. The PFETis also turned off duringIC shutdown (true shutdown)to prevent any leakage currentof
the battery. The device also integrates over-voltage protection, soft-start and thermal shutdown.
The TPS61180IC requires external 3.3VIC supply, while TPS61181 and TPS61182 ICs havea built-in linearAll the devices areina 3×3 mm QFN package.
