TPS65140 Datasheet, PDF (1/31 Pages) Texas Instruments – TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD

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TPS65140, TPS65141
TPS65145
SLVS497C – SEPTEMBER 2003 – REVISED APRIL 2006
TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD
FEATURES
• 2.7-V to 5.8-V Input Voltage Range
• 1.6-MHz Fixed Switching Frequency
• 3 Independent Adjustable Outputs
• Main Output up to 15 V With <1% Typical
Output Voltage Accuracy
• Virtual Synchronous Converter Technology
• Negative Regulated Charge Pump Driver V_O2
• Positive Charge Pump Converter V_O3
• Auxiliary 3.3-V Linear Regulator Controller
• Internal Soft Start
• Internal Power-On Sequencing
• Fault Detection of all Outputs (TPS65140/45)
• No Fault Detection (TPS65141)
• Thermal Shutdown
• System Power Good
• 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 TPS6514x series offers a compact and small
power supply solution to provide 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 V_O1 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
TPS65140/41 has a typical switch current limit of 2.3
A and the TPS65145 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 capacitors can be used.
Additionally, the TPS6514x series has a system
power good output to indicate when all supply rails
are acceptable. For LCD panels powered by 5 V the
device 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 TPS65140/45 goes into shutdown 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. The TPS65141 does not
enter shutdown when one of its outputs is below its
power good threshold.
TPS6514x
Vin
2.7 V to 5.8 V
Boost
Converter
V_o1
Up to 15 V / 400 mA
Positive Charge
Pump
Negative
Charge Pump
Vcom Buffer
Linear Regulator
Controller
V_o3
Up to 30 V / 20 mA
V_o2
Up to 12 V / 20 mA
Vcom
V_o4
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 © 2003–2006, Texas Instruments Incorporated