RT9284A/B

The RT9284A/B is a compact, high efficient and high integration LED driver. Internal 22V MOSFET can support 2 to 5 White LEDs for backlighting and camera flashing.Highly integration and internal compensation network minimizes as 5 external component counts. Optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency. Internal soft start function can reduce the inrush current. Tiny package type of TSOT-23-5 and TSOT-23-6 packages provide the best solution for PCB space saving and total BOM cost.

The RT9284A/B has 10 features.The first one is VIN Operating Range : 2.7V to 5.5V.The second one is Maximum Output Voltage up to 20V.The third one is Dimming with Zero-inrush and Wide Frequency Range.The fourth one is Over Voltage Protection.The fifth one is Output Current up to 100mA at VOUT = 12V.The sixth one is Zero Shutdown Supply Current.The seventh one is Minimize the External Component.The eighth one is Small LC Filter.The ninth one is Internal Soft Start.The tenth one is RoHS Compliant and 100% Lead (Pb)-Free.

The recommended value of inductor for 3 to 5 WLEDs applications are 4.7 to 22H. Small size and better efficiency are the major concerns for portable device, such as RT9284A/B used for mobile phone. The inductor should have low core loss at 1.2MHz and low DCR for better efficiency. To avoid inductor saturation current rating should be considered.Input and output ceramic capacitors of 1F are recommended for RT9284A/B applications. For better voltage filtering, ceramic capacitors with low ESR are recommended. X5R and X7R types are suitable because of their wider voltage and temperature ranges.