SD42351 SILAN | Alldatasheet
Document overview
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Technical content
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. SOT-89-3 * Low dropout voltage. * Low quiescent current * Build-in thermal protection * Supply voltage range 3V ~ 6V APPLICATIONS * 1W Power LED driver * 2KV HBM ESD protection * Advanced Bi-CMOS process.
ORDERING INFORMATION
Package Type Seal Current Value (Typical) (mA) SD42351NA 351A 335 SD42351NB 351B 305 SD42351NC 351C 270 SD42351ND 351D 245 SD42351NE 351E 215 SD42351NG 351G 170 SOT-89-3 SD42351NH 351H 150 SD42351NL 351L 110 HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.5 2008.03.13 Http: //www.silan.com.cn Page 1 of 5
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.5 2008.03.13 Http: //www.silan.com.cn Page 2 of 5 ABSOLUTE MAXIMUM RATINGS (Tamb=25°C) Characteristics Symbol Rating Unit Max Supply Voltage VDD(max) 6 V Min Supply Voltage VDD(min) 3 V Operating Temperature Tamb 0 ~ + 70 °C Storage Temperature Tst -40 ~ +150 °C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Tamb=25°C, IOUT=335mA) Characteristics Symbol Test condition Min. Typ. Max. Unit Supply Voltage Range VDD -- 3 -- 6 V Quiescent Current IQ -- -- 160 200 uA Output Current IOUT 3V≤VIN≤6V 320 335 350 mA Current Line Regulation OUT IN OUT I *ΔV ΔI 3V≤VIN≤6V -- 2.08 -- %/V Dropout Voltage Vdropout I=335mA,Measured at VOUT -- 120 -- mV Power NMOS Leakage Ileak VOUT＝5V -- 0.1 1 μA Thermal Shut-down Temp Tj(sd) -- -- 140 -- °C Shut-down Temp Hysteresis Thyst -- -- 20 -- °C
Pin No. Pin Name I/O Pin Description 1 VOUT O LED Current Output. 2 GND -- Ground . 3 VDD I Power Supply. 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 pr ocess. 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 contro lling the current passing by the LED, which eliminates the limitation of traditional voltage regulator IC. The device consists of Voltage Refere nce, Error Amplifier, Power NMOS , Current Sense Resistance, LOGIC Enable and Over Temperature Protection Circuit. The resi stance 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 elim inated 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 REV:1.5 2008.03.13 Http: //www.silan.com.cn Page 3 of 5
SOT-89-3 UNIT: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.5 2008.03.13 Http: //www.silan.com.cn Page 4 of 5
HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV:1.5 2008.03.13 Http: //www.silan.com.cn Page 5 of 5 ATTACH
Revision History
2006.06.16 1.0 Original 2006.11.24 1.1 Modify the “ORDERING INFORMATION” 2007.03.12 1.2 Modify the “Min Supply Voltage” and “Current file value” 2007.04.20 1.3 Add the “SD42351NE” 2007.11.07 1.4 Add the “SD42351NL” 2008.02.21 1.5 Add the “SD42351NG” and “SD42351NH” Note：Silan reserves the right to make changes without notice in this specification for the improvement of the design and performance. Silan will supply the best possible product for customers.