TPS65100 Datasheet, PDF (1/25 Pages) Texas Instruments – TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND VCOM BUFFER

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TPS65100
TPS65105
SLVS496B – SEPTEMBER 2003 – REVISED MARCH 2004
TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND VCOM BUFFER
FEATURES
• 2.7-V to 5.8-V Input Voltage Range
• 1.6-MHz Fixed Switching Frequency
• 3 Independent Adjustable Outputs
• Main Output of up to 15 V With < 1% Output
Voltage Accuracy
• Negative Output Voltage Down to -12 V/20 mA
• Positive Output Voltage up to 30 V/20 mA
• Integrated VCOM Buffer
• Auxiliary 3.3-V Linear Regulator Controller
• Internal Soft Start
• Internal Power-On Sequencing
• Fault Detection of all Outputs
• Thermal Shutdown
• Available in TSSOP-24 and QFN-24
PowerPAD™ Packages
APPLICATIONS
• TFT LCD Displays for Notebooks
• TFT LCD Displays for Monitors
• Portable DVD Players
• Tablet PCs
• Car Navigation Systems
• Industrial Displays
DESCRIPTION
The TPS65100/05 offers a compact and small power
supply solution that provides all three voltages
required by thin film transistor (TFT) LCD displays.
The auxiliary linear regulator controller can be used
to generate a 3.3-V logic power rail for systems
powered by a 5-V supply rail only.
The main output, Vo1, is a 1.6-MHz, fixed-frequency
PWM boost converter providing the source drive
voltage for the LCD display. The device is available in
two versions with different internal switch current
limits to allow the use of a smaller external inductor
when lower output power is required. The TPS65100
has a typical switch current limit of 2.3 A, and the
TPS65105 has a typical switch current limit of 1.37 A.
A fully integrated adjustable charge pump
doubler/tripler provides the positive LCD gate drive
voltage. An externally adjustable negative charge
pump provides the negative gate drive voltage. Due
to the high 1.6-MHz switching frequency of the
charge pumps, inexpensive and small 220-nF capaci-
tors can be used.
The TPS65100/05 has an integrated VCOM buffer to
power the LCD backplane. For LCD panels powered
by 5 V only, the TPS65100/05 has a linear regulator
controller using an external transistor to provide a
regulated 3.3-V output for the digital circuits. For
maximum safety, the entire device goes into shut-
down as soon as one of the outputs is out of
regulation. The device can be enabled again by
toggling the input or the enable (EN) pin to GND.
TPS65100/05
Vin
2.7 V to 5.8 V
Boost
Converter
Vo1
Up to 15 V / 400 mA
Positive Charge
Pump
Negative
Charge Pump
Vcom Buffer
Linear Regulator
Controller
Vo3
Up to 30 V / 20 mA
Vo2
Up to −12 V / 20 mA
Vcom
Vo4
3.3 V
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.
PowerPAD is a trademark of Texas Instruments.
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 © 2003–2004, Texas Instruments Incorporated