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OLED power driver enhances image quality for small displays

Dallas, Tex. — Texas Instruments Inc. (TI) has introduced an organic light emitting diode (OLED) power driver designed to enhance image quality for small form factor displays up to 2.5 inches. The TPS65136 power integrated circuit supports active matrix OLED (AMOLED) displays used in mobile phones, digital cameras and portable media players.

AMOLED displays allow each pixel to emit its own light, resulting in high color saturation, thin form factor, high contrast ratio, fast response time and low power consumption, said TI. The TPS65136 manages power to AMOLED displays by providing positive and negative voltages, and supplying less current and lower voltages than passive matrix displays.

With just one 2.2-uH inductor to generate both outputs on the single-inductor, multiple-output converter technology, the TPS65136 is said to provide high picture quality and a smaller solution size with a reduced component count. A buck-boost topology allows the device to generate a positive voltage up to 4.6 V and adjustable negative output voltage down to -7 V. In addition, the TPS65136 input voltage can be above or below the positive output voltage, allowing it to support new batteries with a starting voltage up to 4.8 V.

The unique converter technology results in excellent line and load regulation, said TI, which prevents potential display disturbances in mobile devices during transmit periods. The converter also lowers the switching frequency as the load current decreases to maintain high efficiency over the entire load current range. The TPS65136 maintains the switching frequency above the audible range with a voltage-controlled oscillator to avoid causing audible noise from the vibration of the ceramic output capacitors.

In addition to the TPS65136, the TPS65130 and TPS65131 devices can efficiently power portable battery-powered equipment with a total efficiency of up to 89 percent. The devices' input voltage range of 2.7 V to 5.5 V allows the TPS65130/1 to be directly powered from lithium-ion, three-celled NiMH/NiCd or alkaline batteries. This voltage, combined with the converters' minimum switching frequency of 1.25 MHz, enables small power supply applications as the converters require only a few external components.

Pricing: The suggested resale price of the TPS65136, offered in a 16-pin QFN package, is $1.20. The TPS65131 is available in a 4 x 4 mm, 24-pin QFN package at a suggested resale price starting at $3.00. The TPS65130 also comes in a 4 x 4-mm, 24-pin QFN package, with a suggested resale price of $2.30. All in quantities of 1,000.
Product information: TPS65136 and LED driver and display solutions

Texas Instruments , 1-800-477-8924, www.ti.com

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