Product Overview SEMTECH POWER MANAGEMENT Semtech Automotive Solutions: LED Lighting Interior LED Lighting Map Light Vanity Mirror Illumination Dome Light LCD Backlight for Instrument Cluster Door Panel Illumination LCD Backlight for Center Stack Center High Mount Stop Light (CHMSL) Foot Area Courtesy Light Exterior LED Lighting Rear Combination Lamp Daytime Running Light Under Door Courtesy Light Mirror Down Light Turn Signal WWW.SEMTECH.COM Semtech Automotive Solutions: LCD Backlighting Rugged High Brightness LED Drivers Semtech’s SC446, SC441A and SC441C LED drivers power high brightness LEDs in interior and exterior automotive lighting applications: from turn signal and brake lights, to instrument cluster lighting, and LCD backlighting for SC446 navigation and infotainment. 3-Channel SC446, SC441A, SC441C •Wide input voltage range •Thermally-enhanced TSSOP packaging SC441A/C 4-Channel - Low operating temperature and long life at high ambient conditions 46 SC4 - 1mm pin spacing for no pin-to-pin shorts - Large thermal paddle for low Rθ(J-A) •PWM dimming up to 50kHz - Eliminates audio noise Voltage Fluctuations with No Flicker Clamped Voltage VBATT Voltage 26V 13V “Cold-Crank” Test “Dual Battery” Test 4.5V . . . . “Load Dump” Test Time VIN Range Part Number Operating Abs Max Output Range Number of HB LEDs Auto-Grade AEC-Q100 SC441A 4.5 to 21V 25V Up to 36V Up to 40 @ 150mA/each 4 SC441C 4.5 to 27V 30V Up to 42V Up to 48 @ 150mA/each Planned SC446 4.5 to 27V 30V Up to 42V Up to 36 @ 100mA/each Planned WWW.SEMTECH.COM -2- Semtech Automotive Solutions: LCD Backlighting Boost Survives Load Dump and Cold Crank L1 6.8µH VIN: 4.5V to 30V VOUT up to 42V D1 C2 2x4.7µF/ 50V C1 SW SW VIN FFLAG EN VOUT Up to 150mA/ea R2 OVPIN SC441C TSSOP20-EP R3 OVPRTN PWM Dimming IO1 PWM IO2 IO3 COMP R1 C3 C4 IO4 SS IOSET PGND IOGND AGND R4 SEPIC Provides High Efficiency when VIN Voltage is Near VOUT L1 4.7µH VIN: 9V to 24V C1 47nF C1 SW VOUT VIN EN PWM Dimming VOUT: 15V to 18V D1 60V/1A C2 4.7µF 50V Up to 150mA/ea R2 OVPIN SC446 TSSOP16-EP PWM R3 OVPRTN IO1 R1 1.47k C4 14nF IO2 COMP IO3 SS C5 47nF R4 RSET AGND GND WWW.SEMTECH.COM -3- Semtech Automotive Solutions: Boost LED Drivers Part Number Total # LEDs Current Current # LED per (mA/S) Strings String VOUT (V) # LEDs (mA) VIN (V) fsw (MHz) Dimming Max Abs Max Nom Max freq. Package Auto-Grade (footprint x H max) AEC-Q100 Max Max Max Max Max Max Min SC441A 40 600 150 4 10 36 4.5 21 25 0.7 PWM Up to 50kHz TSSOP-20 EDP 4 SC441C 48 600 150 4 12 42 4.5 27 30 0.7 PWM Up to 50kHz TSSOP-20 EDP Planned SC446 36 300 100 3 12 42 4.5 27 30 0.7 PWM Up to 50kHz TSSOP-16 EDP Planned SC442 120 300 30 10 12 42 4.5 21 25 SC440A 72 180 30 6 12 42 4.5 27 30 SC443 36 90 30 3 12 42 4.5 27 30 SC4540 10 30 30 1 10 38 2.8 12 20 SC4509 5 30 N/A 1 5 20 2.7 10 20 PWM 0.5-1.0 Up to 50kHz MLPQ-UT-28 (4x4 x0.6mm) PWM Up to 50kHz ML PQ-24 (4x4 x1.0mm) PWM 0.2-1.2 Up to 50kHz MLPQ-UT-16 (3x3 x0.6mm) 0.8 PWM Up to 50kHz MLPD-UL8 (2x2 x0.6mm) 1.2 PWM Up to 10kHz MLPD-W8 (2x2 x0.8mm), SOT23-6 0.8 The Semtech name and logo, the Semtech logo and the Semtech International AG logo are registered trademarks of Semtech Corporation in the U.S.A. and other countries. Semtech makes no warranty, representation or guarantee, express or implied, regarding the suitability of its products for any particular purpose. ©2010 Semtech Corporation. All rights reserved. PM-Auto-PB-1110 WWW.SEMTECH.COM -4-