SC4502/SC4502H 1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start POWER MANAGEMENT Features Description The SC4502/SC4502H is a high-frequency current-mode Low saturation voltage switch: 210mV step-up switching regulator with an integrated 1.4A (250mV for the SC4502H) power transistor. Its high switching frequency (program- Constant switching frequency current-mode control mable up to 2MHz) allows the use of tiny surface-mount Programmable switching frequency up to 2MHz external passive components. Programmable soft-start Soft-Start function eliminates high inrush current during start-up. The inter- Input voltage ranges from 1.4V to 16V nal switch is rated at 32V (40V for the SC4502H) mak- Output voltage up to 32V (40V for the SC4502H) ing the converter suitable for high voltage applications Low shutdown current such as Boost, SEPIC and Flyback. Adjustable undervoltage lockout threshold Small low-profile thermally enhanced lead free The operating frequency of the SC4502/SC4502H can package. This product is fully WEEE and RoHS be set with an external resistor. The ability to set the compliant. operating frequency gives the SC4502/SC4502H design Applications flexibilities. A dedicated COMP pin allows optimization of Flat screen LCD bias supplies the loop response. The SC4502/SC4502H is available in thermally enhanced 10-pin MLPD package. TFT bias supplies XDSL power supplies Medical equipment Digital video cameras Portables devices White LED power supplies Typical Application Circuit D1 L1 VIN VOUT 5V 12V 10BQ015 R1 Efficiency 8 6,7 866K 95 IN SW 10.5 H, 700KHz H, 1.4MHz 3 2 5.3 OFF ON SHDN FB 90 C2 C1 SC4502 10 F 2.2 F 10 1 85 SS COMP R2 GND ROSC R3 80 100K C3 4,5 9 C6 47nF 75 R4 3.3 H, 2MHz C4 70 65 All Capacitors are Ceramic. 60 V = 5V IN 55 V = 12V OUT 50 f(RMHz) (K ) R (K ) C(CpF)(LpF) ( H) 0.0 0.1 0.2 0.3 0.4 0.5 3 4 4 6 1 02.7373. 203. 1-50 10.5 (Falco D08019) Load Current (A) 10.4539. 90.5 5-6 5.3 (Sumida CDRH5D28) 22763. 50.3 3232)3.3 (Coilcraft DO1813P Figure 1(b). Efficiencies of 5V to 12V Boost Converters at 700KHz, 1.4MHz and 2MHz. Figure 1(a). 5V to 12V Boost Converter. Revision: July 25, 2005 1 www.semtech.com Efficiency (%)SC4502/SC4502H POWER MANAGEMENT Absolute Maximum Rating Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Plarameter Spymbo Tsy Unit SVupply Voltage -V0.3 to 16 IN SVW Voltage -V0.3 to 32 SW SVW Voltage (SC4502H) -V0.3 to 40 SW FVB Voltages -V0.3 to 2.5 FB SVHDN Voltage -0.3 to V+V1 SHDN IN OTperating Temperature Range -C40 to +85 A Thermal Resistance Junction to Ambient (MLPD-10) 4W0 C/ JA MTaximum Junction Temperature 1C60 J STtorage Temperature Range -C65 to +150 STG LTead Temperature (Soldering)10 sec 2C60 LEAD EDSD Rating (Human Body Model) E0S 2V00 Electrical Characteristics Electrical Characteristics Unless other specified: V = 2V, SHDN = 1.5V, R = 7.68k , -40C < T = T < 85C OSC IN A J Psarameter Tnest Condition Mpi Txy Mta Uni Minimum Operating Voltage 14.3 1V. Maximum Operating Voltage 1V6 T=425C 12.2210.24 1V.26 A Feedback Voltage -40C < T<785C 17.21 1V.26 A FVeedback Voltage Line Regulation 1.5V <<116V 0%.0 IN FB Pin Bias Current 400 8An 1 Error Amplifier Transconductance 60 Error Amplifier Open-Loop Gain 4B9 d CVOMP Source Current =51.1V A FB CVOMP Sink Current =51.4V A FB VQVuiescent Supply Current = 1.5V, V=10 ( Not Switching ) 16. 1A. m IN SHDN COMP VSVupply Current in Shutdown =00 181 A IN SHDN Switching Frequency 15.3 17. 1z. MH Maximum Duty Cycle 805 9 % Minimum Duty Cycle 0% Switch Current Limit 12.4 A SIwitch Saturation Voltage =01.3A 201 3V4 m SW Switch Saturation Voltage (SC4502H) I=01.3A 205 3V9 m SW 2005 Semtech Corp. www.semtech.com 2