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200mA power supply improves picture quality in AMOLED displays

Texas Instruments has introduced a 200mA dual output power supply designed to provide improved picture quality for active matrix OLED displays that require positive and negative supply rails. The TPS65137 uses a LDO (low dropout) post regulator for line and load transient response with minimum output voltage ripples to provide stable picture quality. With its wide input range of 2.3 to 5.5 V, solution size of 3x3mm QFN package, and small external component count, the device is suited for AMOLED displays in portable devices such as mobile phones and smartphones. Key features and benefits of the device include an LDO post regulator for positive output to provide line and load transient response with minimum output voltage ripples for achieving stable picture quality; advanced power save mode with out-of-audio control that reduces switching frequency as the load current decreases and maintains high efficiency over the entire load current range without audible noise; and digitally programmable negative output voltage from -2.2 to -4.9V in digital step.