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LP3311S Datasheet(PDF) 1 Page - Lowpower Semiconductor inc |
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LP3311S Datasheet(HTML) 1 Page - Lowpower Semiconductor inc |
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1 / 7 page  Preliminary Datasheet LP3311S LP3311s – 02 Version 2.0 Datasheet May.-2013 www.lowpowersemi.com Page 1 of 7 High Performance, Constant Current Switching Regulator For 8PCS White LED In Series General Description The LP3311S is a 1MHz PWM boost switching regulator designed for constant current white LED driver applications. The LP3311S can drive a string of up to 8 white LED in series, ensuring uniform brightness and eliminating several ballast resistors. The LP3311S implements a constant frequency 1MHz PWM control scheme. The high frequency PWM operation also saves board space by reducing external component size. To improve efficiency, the feedback voltage is set to 200 mV, which reduces the power dissipation in the current setting resistor. 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. Ordering Information LP3311S F: Pb-Free Package: B6: SOT23-6 Pin Configurations IN EN SW OVP FB 1 2 3 4 6 SOT-23-6 GND 5 Features High Efficiency: 90% 1MHz Fixed-Frequency PWM Operation Maximum Output Voltage up to 29V Operating Range : 2.7V to 5.5V Shutdown Supply Current:<1uA Available in SOT23-6 Package Built-in 29V Over Voltage Protection Minimize the External Component RoHS Compliant and 100% Lead (Pb)-Free Applications WLED Backlight driver OLED Backlight driver PDA MID/PTV Typical Application Circuit 1uF 4.7uH 10uF Vin GND EN FB Vin SW OVP LP3311S R1 |
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