TPS65170 Datasheet, PDF (1/33 Pages) Texas Instruments – LCD Bias Supply

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LCD Bias Supply
Check for Samples :TPS65170
TPS65170
SLVSA27 – OCTOBER 2009
FEATURES
1
• 8.6V to 14.7V Input Voltage Range
• 2.8A Boost Converter Switch Current Limit
• Boost Converter Output Voltages up to 18.5V
• Boost and Buck Converter Short-Circuit
Protection
• 1.5A Buck Converter Switch Current Limit
• Fixed 750kHz Switching Frequency for Buck
and Boost Converters
• Fixed Buck Converter Soft-Start
• Programmable Boost Converter Soft-Start
• Two Charge Pump Controllers to Regulate V_GH
and V_GL
• Control Signal for External High-Side MOSFET
Isolation Switch
• Reset Signal With Programmable Reset Pulse
Duration
• Thermal Shutdown
• 28-Pin 5×5 mm QFN Package
The TPS65170 also provides a reset circuit that
monitors the buck converter output (V_LOGIC) and
generates a reset signal for the timing controller
during power-up.
A control signal can also be generated to control an
external MOSFET isolation switch located between
the output of the boost converter and the display
panel.
Isolation Switch
Control
Boost
Converter
Buck
Converter
Positive
LDO Controller
APPLICATIONS
• LCD TVs and Monitors
Negative
LDO Controller
DESCRIPTION
The TPS65170 provides a simple and economic
power supply solution for a wide variety of LCD bias
applications.
In typical display panel applications, the boost
converter generates the display panel’s source
voltage V_S, the buck converter generates the
system’s logic supply V_LOGIC, and the two charge
pump controllers regulate the external charge pumps
generating the display transistors’ on and off supplies
V_GH and V_GL.
By using external transistors to regulate the charge
pump output voltage, power dissipation in the IC is
significantly reduced, simplifying PCB thermal design
and improving reliability.
Reset
Generator
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.
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 © 2009, Texas Instruments Incorporated