SC4509 Semtech Corporation, SC4509 Datasheet
SC4509
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SC4509 Summary of contents
Page 1
... LEDs with a wide input voltage range of 2 volts. Designed for 20V output voltage, the SC4509 operates with a constant 1.2MHz PWM fre- quency. To optimize effi ciency, the feedback voltage is set to only 199mV, minimizing the power loss in the current setting resistor ...
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... Typ, -40ºC to 85°C for Min and Max. A Min Typ Max 2.7 2.6 182 199 35 1.0 1.2 20 =25 °C 160 A 90 =25 °C 300 500 A = Open 0.01 = Open 3 OUT 1 1.8 SC4509 Units °C °C C/W °C °C kV Units 10 V 3.3 mA 216 mV 100 nA 1.4 MHz V 300 mV % 700 mA 5 ...
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... L = 22μH; unless otherwise noted OUT Symbol Conditions GND IL EN/ OVP 150mA f_sch 25V; V f_sch OUT 3 = +25°C for Typ, -40ºC to 85°C for Min and Max. A Min Typ Max 60 100 25 30 0.7 = GND 1.0 SW SC4509 Units 1.0 μA μ 4.0 μA www.semtech.com ...
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... VIN SC4509WLTRT 4 EN/SS SC4509EVB Notes: (1) Only available in tape and reel packaging. A reel contains 3000 devices. (2) Lead-free package. This product is fully WEEE and RoHS compliant. (3) Specify package preference when ordering. EN/SS 8 VIN VOUT 5 4 SC4509 PRELIMINARY Package (1)(2) SOT23-6 (1)(2) MLPD-W8 2mmx2mmx0.75mm (3) Evaluation Board www.semtech.com ...
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... The LED brightness can be controlled by applying a PWM signal to this pin. VIN Input voltage pin. Connect a 1μF capacitor from this pin to GND. SW Switching pin - collector of the internal switch. Exposed pad (bottom); connect to GND directly beneath package. 5 SC4509 www.semtech.com ...
Page 6
... SC4509 ideal for battery-operated products. The SC4509 can be confi gured as a voltage regulated boost converter current-regulating boost converter for driving white LEDs. The device is designed to be stable without additional external components in both cases. ...
Page 7
... As a result, there will be a set error in the converter output voltage. This non-random error is caused by the feedback voltage divider ratio. It cannot be corrected by the feedback loop. © 2007 Semtech Corp. 7 SC4509 www.semtech.com ...
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... POWER MANAGEMENT Application Circuit for OLED Panels VIN www.DataSheet4U.com EN/SS © 2007 Semtech Corp. L1 22μ VIN SC4509 4 EN/SS C1 1μF 8 SC4509 PRELIMINARY Vo OLED PANEL R1 C2 1μ www.semtech.com ...
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... I LED (mA) Effi ciency vs. LED Current vs. Input Voltage V = 12V, (3 LED) OUT 85% 80% 75% 70% VIN = 2.7V 65% 60% 55% 50% 45% 40% 35 LED (mA) Frequency vs. Temperature vs. Input Voltage 16V OUT 1.20 VIN = 2.7V 1.15 1.10 VIN = 3.6V 1.05 1.00 -40 - Temperature (Deg. C) SC4509 VIN = 3. VIN = 3. www.semtech.com ...
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... FPWM = 1kHz IN OUT DTY (%) Switch Current Limit vs. Temperature vs. Complementary Duty Cycle (1-D) 700 650 10% 600 550 500 450 60% 400 90% 350 40% 300 250 200 -40 - Temperature (Deg. C) SC4509 2.8 3.2 3.6 4 100 20 100 www.semtech.com ...
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... Typical Characteristics (Cont.) Switch Complementary Duty Cycle vs. Input Voltage vs. LED Current, V 35.0% 30.0% 25.0% ILED = 20mA 20.0% 15.0% www.DataSheet4U.com 10.0% 5.0% 0.0% 2.7 2.9 3.1 3.3 3.5 3.7 Switching Waveform V = 3.6V 20mA LED © 2007 Semtech Corp. = 16V, (4 LED) OUT ILED = 30mA 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 VIN (V) = 16V (4 LEDs) OUT 11 SC4509 Startup Current V = 3.6V 30mA 16V (4 LEDs) IN LED OUT www.semtech.com ...
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... POWER MANAGEMENT Layout Example www.DataSheet4U.com © 2007 Semtech Corp. Top Layer Bottom Layer 12 SC4509 PRELIMINARY www.semtech.com ...
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... BSC 0.95 BSC e1 .075 BSC 1.90 BSC L .012 .018 .024 0.30 0.45 0.60 (.024) (0.60 0° 10° 0° 10° aaa .004 0.10 bbb .008 0.20 ccc .008 0. GAGE PLANE 0. (L1) A DETAIL A -H- DIMENSIONS DIMENSIONS MILLIMETERS MILLIMETERS (.098) (2.50) .055 1.40 .037 0.95 .024 0.60 .043 1.10 .141 3.60 SC4509 www.semtech.com ...
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... D 1.90 2.00 2.10 .075 .079 .083 D1 .059 .063 .067 1.50 1.60 1.70 E .075 .079 .083 1.90 2.00 2.10 E1 .031 .035 .039 0.80 0.90 1.00 e .020 BSC 0.50 BSC L .008 .012 .016 0.20 0.30 0. aaa .003 0.08 bbb .003 0.08 DIMENSIONS DIM INCHES MILLIMETERS (.079) (2.00 .051 1.30 H .063 1.60 K .035 0.90 P .020 0.50 R .006 0.15 X .012 0.30 Y .028 0.70 Z .106 2.70 SC4509 www.semtech.com ...
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... POWER MANAGEMENT www.DataSheet4U.com Contact Information © 2007 Semtech Corp. Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com 15 SC4509 www.semtech.com ...