TPS65105

The TPS65100/05 offers a compact and small powersupply solution that provides all three voltages required by thin film transistor (TFT) LCD displays. The auxiliary linear regulator controller TPS65100/05 can be usedto generate a 3.3-V logic power rail for systemspowered by a 5-V supply rail only.
The main output, Vo1, is a 1.6-MHz, fixed-frequencyPWM boost converter providing the source drivevoltage for theLCD display. The TPS65100/05 is available in two versions with different internal switch current  limits to allow the use of asmaller external inductorwhen lower output power is required. The TPS65100has a typical switch current limit of 2.3 A, andthe TPS65105 has a typical switch current limit of 1.37 A.A fully integrated adjustable charge pumpdoubler/tripler provides the positive LCD gate drivevoltage. An externally adjustable negative charge pump provides the negative gate drive voltage. Dueto the high 1.6-MHz switching frequency of thecharge pumps, inexpensive and small 220-nF capacitors can be used.
The TPS65100/05 has an integrated VCOM buffer to power the LCD backplane. For LCD panels powered by 5 V only, the TPS65100/05 has a linear regulatorcontroller using an external transistor to provide aregulated 3.3-V output for the digital circuits. Formaximum safety, the entire device goes into shut- down as soon as one of the outputs is out of
regulation. The device can be enabled again bytoggling the input or the enable (EN) pin to GND.