TPS65142 Datasheet, PDF (1/32 Pages) Texas Instruments – LCD Bias Power Integrated with WLED Backlight Drivers

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LCD Bias Power Integrated with WLED Backlight Drivers
Check for Samples: TPS65142
TPS65142
SLVSAX5 – JULY 2011
FEATURES
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• Integrated Bias and Backlight Power
• 2.3 V to 6 V Input Voltage Range for Bias
– Up to 16.5 V Boost Converter with 1.8 A
Switch Current
– 1.2 MHz/650 kHz Selectable Switching
Frequency
– Internal Compensation
– Internal Soft-start at Power on
– Reset Function (XAO Signal)
– Regulated VGH
– Regulated VGL
– Gate Voltage Shaping
– LCD Discharge Function
• 150 mA Unity Gain VCOM Buffer
• 4.5 V to 24 V WLED Backlight Input Range
– Integrated 1.5 A/40 V MOSFET
– Boost Output Tracks WLED Voltage
– Internal Compensation
– External Current Setting Input
– 6 Current-Sink Channels of 25 mA
– Better than 3% Current Matching
– Up to 1000:1 PWM Dimming Range
SPACER
• Overvoltage Protection
• Thermal Shutdown
• Undervoltage Lockout
• 32-Pin 6 x 3 mm² QFN Package
APPLICATIONS
• Note-PC TFT-LCD Panels
• Tablet TFT-LCD Panels
DESCRIPTION
The TPS65142 provides a compact solution to the
bias power and the WLED backlight in note-pc
TFT-LCD panels. The device features a boost
converter, a positive charge pump regulator, and a
negative charge pump regulator to power the source
drivers and the gate drivers. A 150mA unity-gain
high-speed buffer is offered to drive the VCOM plane.
Gate voltage shaping and the LCD discharge function
are offered to improve the image quality. A reset
function allows a proper reset of the TCON at the
power on. The TPS65142 also offers the complete
solution to driver up to 6 chains of WLEDs with
1000:1 ratio PWM dimming.
All features are integrated in a compact 6 x 3 mm²
Thin QFN package.
V_IN
3.3 V
AVDD Boost Converter
AVDD
9 V/300 mA
Positive Charge Pump Regulator,
Gate Voltage Shaping
LCD Discharge Function
V_GHM
24 V/20 mA
BL_PWR
4.5 V to 24 V
PWM_DIM
BL_EN
Negative Charge Pump Regulator
Reset Function
Unity Gain VCOM Buffer
WLED Boost Converter
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With Current Sinks
V_GL
-6 V/20 mA
XAO
V_COM
(±150 mA)
IFB_n
25 mA
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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 © 2011, Texas Instruments Incorporated