The TPS65100-Q1 device 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
The main output, VO1, is a 1.6-MHz fixed-frequency PWM boost
converter providing the source-drive voltage for the LCD display. The TPS65100-Q1 has a typical
switch current limit of 2.3 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.
The TPS65100-Q1 has an integrated VCOM buffer to power the LCD backplane. For LCD panels
powered by 5 V only, the TPS65100-Q1 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
TPS65100-Q1 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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