Ricoh Europe (Netherlands) B.V., the European Headquarters of Ricoh Company Ltd., Tokyo, announces the R1285 driver IC. It is designed to provide a dual power supply to Active Matrix OLED Display units. This new emerging display technology is designed for applications such as mobile phones, MP3 players, PDA, PND and other portable gadget devices.

Active Matrix OLED (or AMOLED) displays require a dual power supply consisting of a positive and a negative voltage supply. The R1285 offers a small one chip solution with only a few external components to complete the circuit. Both power supplies include an internal MOSFET driver with a low on-resistance level for high efficiency performance. AMOLED displays have major advantages compared to the current LCD display technology; such as lower power consumption, highly robust design, superior image quality, thin, light-weight and cost effective. For these reasons AMOLED displays will be adopted rapidly, particularly in the portable devices market.

The R1285 has a soft start function to prevent high inrush current peaks during the start up sequence; moreover the start up sequence of both outputs is made internally. Once the positive output reaches its nominal level, the negative output will initialize as well. By using the CE pin the R1285 can be turned off. Both outputs use an embedded auto-discharge function to discharge the remaining output voltage to 0V rapidly, preventing a phenomenon such as random graphics on the display during the shut-down period.

With regards to protection circuits, the R1285 has an Under Voltage Lock Out (UVLO) circuit, which disables the chip once the input voltage is below a specific threshold. Additionally, some over-current and short protection is embedded to keep the internal drivers off with a latch function once the fault condition exceeds a time-out period, therefore preventing the chip from overheating or causing damage to other parts on the circuit board. The chip resumes to normal operation by using the chip enable or UVLO functions.

The R1285 operates at a high frequency of 1.4MHz and uses small inductors to minimise board space. Optional features are a product version with dual fixed output voltages and a version with a fixed positive and adjustable negative output voltage. R1285 is available in a small DFN2730 package, convenient to use on high density and small circuit boards.

About Ricoh

Ricoh Company, Ltd (“Ricoh Company”) is a global technology leader, specializing in the office and production printing markets. Ricoh works with organisations around the world to modernise work environments and optimise document efficiency. With over 108,500 employees worldwide, it operates in Europe, the Americas, Asia Pacific, China and Japan.

Ricoh Europe Holdings Plc is a public limited company and

the EMEA headquarters of Ricoh Company with operations located in London, United Kingdom and Amstelveen, the Netherlands. The EMEA operations comprise over 35 sales subsidiaries and affiliates.
In the fiscal year ended 31 March 2009, revenues from Ricoh’s EMEA operations totalled over YEN 523.4 billion accounting for 25.0 per cent of Ricoh Company’s global revenues. Ricoh Company’s worldwide sales totalled over YEN 2,091.7 billion during the year ended 31 March 2009.

www.ricoh-europe.com

Ricoh Electronic Devices Company (REDC) is in charge of semiconductor business in Ricoh Company, Limited. REDC develops and supplies semiconductor devices for image processing products of Ricoh Group company and supplies standard semiconductor devices for the customers. The head office of REDC is located in Osaka Japan with its branches in Europe, the U.S.A., Korea, China and Taiwan.

Ricoh Europe Netherlands B.V
www.ricoh.com/LSI/
semicon@ricoh-europe.com