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| SD42351 350MA WHITE SINGLE LED DRIVER DESCRIPTION The SD42351 is a low dropout current regulator rated for constant LED sink current. The low quiescent current and low dropout voltage is achieved by advanced Bi-CMOS process. FEATURES * No external component required. * Fixed 110mA, 150 mA, 170 mA, 215 mA, 245mA, 270mA, 305mA, 335mA sink current. * Output short / open circuit protection. * Low dropout voltage. * Low quiescent current * Build-in thermal protection * Supply voltage range 3V ~ 6V * 2KV HBM ESD protection * Advanced Bi-CMOS process. SOT-89-3 APPLICATIONS * 1W Power LED driver ORDERING INFORMATION Package Type SD42351NA SD42351NB SD42351NC SOT-89-3 SD42351ND SD42351NE SD42351NG SD42351NH SD42351NL Seal 351A 351B 351C 351D 351E 351G 351H 351L Current Value (Typical) (mA) 335 305 270 245 215 170 150 110 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.5 2008.03.13 Page 1 of 5 SD42351 BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS (Tamb=25C) Characteristics Max Supply Voltage Min Supply Voltage Operating Temperature Storage Temperature Symbol VDD(max) VDD(min) Tamb Tst Rating 6 3 0 ~ + 70 -40 ~ +150 Unit V V C C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Tamb=25C, IOUT=335mA) Characteristics Supply Voltage Range Quiescent Current Output Current Current Line Regulation Dropout Voltage Power NMOS Leakage Thermal Shut-down Temp Shut-down Temp Hysteresis Symbol VDD IQ IOUT IOUT VIN * IOUT Test --3VVIN6V 3VVIN6V condition Min. 3 -320 ------ Typ. -160 335 2.08 120 0.1 140 20 Max. 6 200 350 --1 --- Unit V uA mA %/V mV A C C Vdropout Ileak Tj(sd) Thyst I=335mA,Measured at VOUT VOUT5V --- HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.5 2008.03.13 Page 2 of 5 SD42351 PIN CONFIGURATION PIN DESCRIPTION Pin No. 1 2 3 Pin Name VOUT GND VDD I/O O -I LED Current Output. Ground . Power Supply. Pin Description FUNCTION DESCRIPTION The SD42351 is a low dropout current regulator rated for constant LED sink current. The low quiescent current and low dropout voltage is achieved by advanced Bi-CMOS process. Its main function is to stabilize the current passing, other than the LED voltage. Traditional LED drivers are Voltage regulator IC, which will affect the brightness because of different forward voltages, although the LEDs are in the same structure. SD42351 controls the brightness of the LED by controlling the current passing by the LED, which eliminates the limitation of traditional voltage regulator IC. The device consists of Voltage Reference, Error Amplifier, Power NMOS, Current Sense Resistance, LOGIC Enable and Over Temperature Protection Circuit. The resistance senses the output current and transform to the voltage, which compared with the reference voltage. The error is amplified, controls the Power NMOS, so that the output current is regulated. Inrush current (over 1 A) in traditional LED drivers is eliminated by the initial current limit circuit, thus constant sink current in the LED is maintained. TYPICAL APPLICATION CIRCUIT Note:The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test . HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.5 2008.03.13 Page 3 of 5 SD42351 PACKAGE OUTLINE SOT-89-3 UNIT: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.5 2008.03.13 Page 4 of 5 |
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