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SC4503TSKTRT
SC4503 1.3MHz Step-Up Switching Regulator with 1.4A Switch POWER MANAGEMENT Description Features The SC4503 is a 1.3MHz current-mode step-up switching regulator with an integrated 1.4A power transistor. Its high switching frequency allows the use of tiny surface-mount external passive components. The SC4503 features a combined shutdown and soft-start pin. The optional soft-start function eliminates high input current and output overshoot during start-up. The internal compensation network accommodates a wide range of voltage conversion ratios. The internal switch is rated at 34V making the device suitable for high voltage applications such as Boost and SEPIC. Low Saturation Voltage Switch: 260mV at 1.4A 1.3MHz Constant Switching Frequency Peak Current-mode Control Internal Compensation Programmable Soft-Start Input Voltage Range From 2.5V to 20V Output Voltage up to 27V Uses Small Inductors and Ceramic Capacitors Low Shutdown Current (< 1μA) Low Profile 5-Lead TSOT-23 and 8-Lead 2X2mm MLPD-W packages Fully WEEE and RohS compliant The SC4503 is available in low-profile 5-lead TSOT-23 and 8-lead 2X2mm MLPD-W packages. The SC4503’s low shutdown current (< 1μA), high frequency operation and small size make it suitable for portable applications. Applications Local DC-DC Converters TFT Bias Supplies XDSL Power Supplies Medical Equipment Digital Cameras Portable Devices White LED Drivers Typical Application Circuit Typical Application Circuit D1 5V 4.7µH 5 C1 1µF 90 C4 15pF SW R1 432k SC4503 OFF ON 4 SHDN/SS FB 95 12V, 0.5A 10BQ015 1 IN Efficiency vs Load Current VOUT C2 4.7µF 3 GND 2 1.3MHz 85 R2 49.9k Efficiency (%) L1 VIN 80 75 70 65 60 VOUT = 12V 55 50 0.001 C1: Murata GRM188R61A105K C2: Murata GRM21BR61C475K L1: Sumida CDC5D23B-4R7 0.100 1.000 Load Current (A) Figure 1(b). Efficiency of the 5V to 12V Boost Converter Figure 1(a). 5V to 12V Boost Converter May 4, 2007 0.010 1 www.semtech.com
SEMTECH
Semtech Corporation
U.S.A
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