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SC4501 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4501 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 21 page  POWER MANAGEMENT 1 www.semtech.com SC4501 2Amp, 2MHz Step-Up Switching Regulator with Soft-Start Description Features Applications u Flat screen LCD bias supplies u TFT bias supplies u XDSL power supplies u Medical equipment u Digital video cameras u Portables devices u White LED power supplies The SC4501 is a high-frequency current-mode step-up switching regulator with an integrated 2A power transis- tor. Its high switching frequency (programmable up to 2MHz) allows the use of tiny surface-mount external pas- sive components. Programmable soft-start eliminates high inrush current during start-up. The internal switch is rated at 32V making the converter suitable for high voltage ap- plications such as Boost, SEPIC and Flyback. The operating frequency of the SC4501 can be set with an external resistor. The ability to set the operating frequency gives the SC4501 design flexibilities. A dedicated COMP pin allows optimization of the loop response. The SC4501 is available in thermally enhanced 8-Pin MSOP and 10-pin MLPD packages. Typical Application Circuit u Low saturation voltage switch: 220mV at 2A u Constant switching frequency current-mode control u Programmable switching frequency up to 2MHz u Soft-Start function u Input voltage range from 1.4V to 16V u Output voltage up to 32V u Low shutdown current u Adjustable undervoltage lockout threshold u Small low-profile thermally enhanced packages Revision: October 25, 2005 C1 2.2 µF 5V VIN VOUT SC4501 2 3 1 5 6 4 GND SHDN SS IN SW FB ROSC COMP 8 7 ON OFF C3 10BQ015 R4 D1 L1 C2 10 µF 47nF R2 20K R1 174K 12V, 0.7A C4 R3 C6 Figure 1(a). 5V to 12V Boost Converter. All Capacitors are Ceramic. MSOP-8 Pinout f / MHz R 3 / KΩ R 4 / KΩ C 4 / pF C 6 / pF L 1 / µH 0.7 22.1 22.1 2200 - 10.5 (Falco D08019) 1.35 30.9 9.31 820 - 4.7 (Falco D08017) 2 63.4 4.75 470 22 3.3 (Coilcraft DO1813P) Figure 1(b). Efficiencies of 5V to 12V Boost Converters at 700KHz, 1.4MHz and 2MHz. Efficiency 50 55 60 65 70 75 80 85 90 95 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Load Current (A) VOUT = 12V 4.7 µH, 1.4MHz 10.5 µH, 700KHz 3.3 µH, 2MHz VIN = 5V |
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