RT9300B

Preliminary RT9300A/B Tiny Package, Low Dropout Current Source General Description The RT9300A/B low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. The RT9300A/B uses a internal resistor to set the bias current for four LEDs, which are matched to 3%. The RT9300A/B's advantages over ballast resistors include www.DataSheet4U.com much lower bias variation with supply voltage variation, significantly lower dropout voltage, and in some applications, significantly improved efficiency. The RT9300A/B requires a 60/45mV dropout at a 20/15mA load on each output to match the LED brightness. Features z z z z z z Low 60/45mV Dropout at 20/15mA 3% LED Current Matching Simple LED Brightness Control 2.5V to 5.5V Supply Voltage Range Thermal Shutdown Protection RoHS Compliant and 100% Lead (Pb)-Free Applications z z z z Next-Generation Wireless Handsets PDAs, Palmtops, and Handy Terminals Digital Cameras, Camcorders Battery-Powered Equipment Ordering Information RT9300A/B Package Type E : SOT-23-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Sink Current A : 20mA B : 15mA Pin Configurations (TOP VIEW) LED1 LED2 LED3 6 1 EN 5 2 4 3 GND LED4 Note : RichTek Pb-free and Green products are : `RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. `Suitable for use in SnPb or Pb-free soldering proce...