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FEATURES

· 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

DESCRIPTION

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.