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RT9271 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9271 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 15 page  RT9271 1 DS9271-13 March 2007 www.richtek.com Pin Configurations Ordering Information White LED Step-Up Converter in Tiny Package General Description The RT9271 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive one to three LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The RT9271 switches at 1.1 MHz, allowing the use of tiny external components. The input and output capacitor can be as small as 1uF, saving space and cost versus alternative solutions. A low 0.25V feedback voltage minimizes power loss in the current setting resistor for better efficiency. The RT9271 is available in low profile SOT-23-6 package. Features Inherently Matched LED Current Up to 80mA Output Current @ VOUT < 12V High Efficiency : 85% Typical Drives Up to Three LEDs from 2.8V Supply 20V Internal Switch Fast 1.1 MHz Switching Frequency Uses Tiny 1 mm Height Inductors Requires Only 1uF Output Capacitor Low Profile SOT-23-6 Package Optional 15V Over Voltage Protection RoHS Compliant and 100% Lead (Pb)-Free Applications Mobile Phone Digital Still Camera PDAs, Handheld Computers MP3 Players GPS Receivers Marking Information For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail. (TOP VIEW) Note : There is no pin1 indicator on top mark for SOT-23-6 type, and pin1 will be lower left pin when reading top mark from left to right. Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100% matte tin (Sn) plating. LX GND FB EN OVP VCC 4 23 5 6 1 SOT-23-6 SOT-23-5 23 54 1 LX GND FB EN VCC RT9271 Package Type B : SOT-23-5 E : SOT-23-6 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) |
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Similar Description - RT9271 |
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