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TPS65140-Q1 PDF预览

TPS65140-Q1

更新时间： 2024-11-16 12:16:15
品牌 Logo 应用领域
德州仪器 - TI 稳压器输出元件
页数 文件大小 规格书
25页 630K
描述
TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD

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TPS65140-Q1 数据手册

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TPS65140-Q1  
TPS65145-Q1  
www.ti.com ................................................................................................................................................. SGLS277A–NOVEMBER 2004–REVISED APRIL 2008  
TRIPLE OUTPUT LCD SUPPLY WITH LINEAR REGULATOR AND POWER GOOD  
1
FEATURES  
DESCRIPTION  
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  
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.  
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  
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.  
Internal Power-On Sequencing  
Fault Detection of all Outputs  
Thermal Shutdown  
A
fully integrated adjustable charge pump  
System Power Good  
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.  
Available in a TSSOP-24 PowerPAD™ Package  
APPLICATIONS  
•
TFT LCD Displays for Automobiles  
–
–
–
Cluster Panels  
Navigation Displays  
Passenger Entertainment Modules  
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.  
•
•
•
•
TFT LCD Displays for Notebooks  
TFT LCD Displays for Monitors  
Portable DVD Players  
Industrial Displays  
1
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.  
2
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 © 2004–2008, Texas Instruments Incorporated  
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