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LP3321 Datasheet(PDF) 1 Page - Lowpower Semiconductor inc |
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LP3321 Datasheet(HTML) 1 Page - Lowpower Semiconductor inc |
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1 / 9 page  Preliminary Datasheet LP3321 LP3321 – 01 Vesion 1.1 Datasheet Feb.-2011 www.lowpowersemi.com Page 1 of 9 High Performance, Constant Current Switching Regulator For 10PCS White LED In Series General Description The LP3321 is a 1.3MHz PWM boost switching regulator designed for constant- current white LED driver applications. The LP3321 can drive a string of up to 10 white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors. The LP3321 implements a constant frequency 1.3MHz PWM control scheme. The high frequency PWM operation also saves board space by reducing external component sizes. To improve efficiency, the feedback voltage is set to 195 mV and 300mV, 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 LP3321 F: Pb-Free Package: J6: TSOT23-6 J5: TSOT23-5 FB Voltage Default: VFB=195mV A: VFB=300mV Pin Configurations (TSOT23-5) (TSOT23-6) Features High Efficiency: 90% 1.3MHzFixed-Frequency PWM Operation Maximum Output Voltage up to 40V Operating Range : 2.7V to 5.5V Shutdown Supply Current:<1uA Available in TSOT23-5/TSOT23-6 Package Built-in 40V 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 Cout 1uF 10uH Cin 10uF D1 SS14 R1 10 Vin LP3321 4 3 5 EN FB Vin VFB=195mV Marking information Please view website. |
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