The TPS6512x DC-DC converter supplies all three voltages required by amorphous-silicon (a-Si) and low-temperature poly-silicon (LTPS) TFT-LCD displays. The compact layout of the TPS6512x uses a single inductor to generate independently-regulated positive and negative outputs. A free-running variable peak current PWM control scheme time-multiplexes the inductor between outputs. This control architecture operates at a pseudo-fixed-frequency to provide fast response to line and load transients while maintaining a relatively constant switching frequency and high efficiency over a wide range of input and output voltages. Due to the high switching frequency capability of the device, inexpensive and ultra-thin 8.2 or 10 µH inductors can be used.

The main output, VMAIN, is post-regulated to provide a low-ripple source drive voltage for the LCD display. The auxiliary outputs generate a boosted output voltage, VGH, up to 20 V, and a negative output voltage, VGL, down to -18 V for the LCD gate drive. The device has internal current limiting for high reliability under fault conditions. Additionally, the device offers a fixed output linear regulator for the LCD logic circuitry.

• Main Output, VMAIN
  • Adjustable Voltage, 3.0 V to 5.6 V/25 mA
  • Post-Regulated for Low Ripple (5mVPP)
  • ±0.8% Typical Accuracy
  • Efficiency up to 83%
• Positive Output, VGH
  • Adjustable Voltage up to 20 V/2 mA
  • ±3% Typical Accuracy
• Negative Output, VGL
  • Adjustable Voltage down to -18 V/2 mA
  • ±3% Typical Accuracy
• Auxiliary 1.8 V/3.3 V Linear Regulator
• Automatic or Programmable Power Sequencing
• Complete 1 mm Component Profile Solution
• 2.5 V to 5.5 V Input Voltage Range
• Output Short Circuit Protected
• 16-Pin QFN Package (3 × 3 × 0,9 mm)
• APPLICATIONS
  • Small Form Factor a-Si and LTPS TFT LCD
  • Cell Phones, Smart Phones
  • PDAs, Pocket PCs
  • Portable DVD
  • Digital-Still Cameras, Camcorders
  • Handheld Instruments
  • Portable GPS
  • Car Navigation Systems