Pump it up

Texas Instruments has announced two new triple output charge pumps for small low-temperature polysilicon liquid crystal displays and an inductive DC/DC power supply for thin-film transistor LCDs in notebooks and LCD monitors.

Texas Instruments (TI) has announced two new triple output charge pumps for small low-temperature polysilicon (LTPS) liquid crystal displays (LCDs) and an inductive DC/DC power supply for thin-film transistor (TFT) LCDs in notebooks and LCD monitors.

TI’s TPS65110 and TPS65111 triple output power supply charge pumps efficiently manage the three bias voltages required in most LTPS LCD displays used by PDAs, smart phones and digital cameras.

The 4 mm x 4 mm devices come in QFN packages and provide a low 5 mV ripple at 5 mA (typical). Further simplifying design, the TPS65110 and TPS65111 feature internally set power-up and power-down sequencing and require only small ceramic capacitors for operation.

For its part, the TPS65100 power supply IC manages all voltages required by TFT LCD displays in notebooks and LCD monitors. The TPS65100 uses a fixed-frequency boost converter at 1.5 MHz to supply the main source drive for the LCD display.

An integrated adjustable charge pump provides the positive LCD gate drive voltage, and an external adjustable negative charge pump provides the negative gate drive voltage. For LCD panels powered with 5 V, the TPS65100 provides an auxiliary linear regulator controller to provide a regulated 3.3 V for logic circuitry. In addition, the IC integrates a Vcom buffer to drive the display backplane. It comes in a 24-pin TSSOP or 4 mm x 4 mm QFN package.

Suggested resale pricing in 1,000 piece quantities is $1.69 each for the TPS65110 and TPS65111, and $2.69 for the TPS65100. Evaluation modules for both LCD drivers are also available.

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