TPS65140-Q1 Datasheet, PDF (1/25 Pages) Texas Instruments – TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD

TPS65140-Q1
TPS65145-Q1
www.ti.com ................................................................................................................................................. SGLS277A – NOVEMBER 2004 – REVISED APRIL 2008
TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD
FEATURES
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•2 Qualified For Automotive Applications
• 2.7-V to 5.8-V Input Voltage Range
• 1.6-MHz Fixed Switching Frequency
• Three Independent Adjustable Outputs
• Main Output up to 15 V With <1% Typical
Output Voltage Accuracy
• Negative Output Voltage Down to -12 V/20 mA
• Positive Output Voltage up to 30 V/20 mA
• Auxiliary 3.3-V Linear Regulator Controller
• Internal Soft Start
• Internal Power-On Sequencing
• Fault Detection of all Outputs
• Thermal Shutdown
• System Power Good
• Available in a TSSOP-24 PowerPAD™ Package
APPLICATIONS
• TFT LCD Displays for Automobiles
– Cluster Panels
– Navigation Displays
– Passenger Entertainment Modules
• TFT LCD Displays for Notebooks
• TFT LCD Displays for Monitors
• Portable DVD Players
• Industrial Displays
DESCRIPTION
The TPS65140/145 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 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 TPS65140
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 TPS65140/145 has a system power
good output to indicate when all supply rails are
acceptable. For LCD panels powered by 5 V, only the
TPS65140/145 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 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.
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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.
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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 © 2004–2008, Texas Instruments Incorporated