ON Semiconductor Introduces Dual-Output DC-DC Converter for Powering AMOLEDs

PHOENIX - ON Semiconductor has introduced the NCP5810 - a 2 watt (W) dual output dc-dc converter that offers both positive and negative output. The device's output voltage accuracy, high switching frequency, and small package size make it particularly suitable for powering a display driver in active matrix organic light-emitting diode active-matrix (AM) OLED panels, the company said.

"The NCP5810 presents great advantages for the AMOLED power supply," said Manor Narayanan, vice president and general manager of ON Semiconductor's Digital and Consumer Products Group, in a company statement. "ON Semiconductor is dedicated to working with customers to design devices that meet their specific needs. A successful example of such collaboration is the NCP5810, which has been selected by the leading display manufacturer to power the new AMOLED panel for ultra-thin portable multimedia devices and is already in mass production."

AMOLED benefits include better color contrast and video playback quality than today's LCD displays, but they can create added power management challenges for design engineers, the company said. For example, because AMOLED displays are sensitive to changes in power supply voltages, ON Semiconductor said, it designed the NCP5810 to provide accurate feedback voltage with 1% tolerance and a fast line transient response with overshoot of 4 millivolt (mV), given a 500 mV input voltage variation.

According to ON, features include a high overall efficiency up to 85% at 1.75 megahertz (MHz) oscillator frequency; a converter switching frequency of 1.75 MHz, allowing the use of small inductors and ceramic capacitors; and an ultra-thin package with 0.55 mm thickness, allowing the NCP5810 to fit into the thinnest portable design form factor. In addition, it preserves battery power in shut-down mode with true cut-off function that limits the leakage display current to typically 1 microamp (µA), the company said. Additionally, the NCP5810 features cycle-by-cycle peak current limit and thermal shut down protection.