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SC4501 Dataheets PDF



Part Number SC4501
Manufacturers Semtech Corporation
Logo Semtech Corporation
Description 2MHz Step-Up Switching Regulator
Datasheet SC4501 DatasheetSC4501 Datasheet (PDF)

SC4501 2Amp, 2MHz Step-Up Switching Regulator with Soft-Start POWER MANAGEMENT Description The SC4501 is a high-frequency current-mode step-up switching regulator with an integrated 2A power transistor. Its high switching frequency (programmable up to 2MHz) allows the use of tiny surface-mount external passive 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 applications such as .

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SC4501 2Amp, 2MHz Step-Up Switching Regulator with Soft-Start POWER MANAGEMENT Description The SC4501 is a high-frequency current-mode step-up switching regulator with an integrated 2A power transistor. Its high switching frequency (programmable up to 2MHz) allows the use of tiny surface-mount external passive 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 applications such as Boost, SEPIC and Flyback. www.DataSheet4U.com Features u u u u u u u u u Low saturation voltage switch: 220mV at 2A Constant switching frequency current-mode control Programmable switching frequency up to 2MHz Soft-Start function Input voltage range from 1.4V to 16V Output voltage up to 32V Low shutdown current Adjustable undervoltage lockout threshold Small low-profile thermally enhanced packages 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. Applications u u u u u u u Flat screen LCD bias supplies TFT bias supplies XDSL power supplies Medical equipment Digital video cameras Portables devices White LED power supplies Typical Application Circuit VIN 5V 6 OFF ON 3 C1 2.2 µF 8 IN SHDN SC4501 SS GND C3 47nF 4 COMP ROSC 7 R4 C4 1 R3 C6 R2 20K 5 SW FB 2 C2 10 µF L1 D1 VOUT 12V, 0.7A R1 174K 10BQ015 Efficiency 95 10.5µH, 700KHz 90 85 4.7µH, 1.4MHz Efficiency (%) 80 3.3µH, 2MHz 75 70 65 60 All Capacitors are Ceramic. MSOP-8 Pinout f / MHz 0.7 1.35 2 R3 / KΩ 22.1 30.9 63.4 R4 / KΩ 22.1 9.31 4.75 C4 / pF 2200 820 470 C6 / pF 22 L1 / µH 10.5 (Falco D08019) 4.7 (Falco D08017) 3.3 (Coilcraft DO1813P) 55 50 0.0 0.1 0.2 0.3 0.4 VIN = 5V VOUT = 12V 0.5 0.6 0.7 Load Current (A) Figure 1(a). 5V to 12V Boost Converter. Figure 1(b). Efficiencies of 5V to 12V Boost Converters at 700KHz, 1.4MHz and 2MHz. 1 www.semtech.com Revision: October 25, 2005 SC4501 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. Parameter Supply Voltage SW Voltage FB Voltages SHDN Voltage www.DataSheet4U.com Operating Temperature Symbol VIN VSW VFB VSHDN Range TA θJA θJA TJ TSTG TLEAD ESD Typ -0.3 to 18 -0.3 to 32 -0.3 to 2.5 -0.3 to VIN + 1 -40 to +85 40 Units V V V V °C °C/W Thermal Resistance Junction to Ambient (MSOP-8) Thermal Resistance Junction to Ambient (MLPD-10) Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering)10 sec ESD Rating (Human Body Model) 40 160 -65 to +150 260 2000 °C °C °C V Electrical Characteristics Unless specified: VIN = 2V, SHDN = 1.5V, ROSC = 7.68kΩ, -40°C < T A = TJ < 85°C Parameter Undervoltage Lockout Threshold Maximum Operating Voltage Feedback Voltage Feedback Voltage Line Regulation FB Pin Bias Current Error Amplifier Transconductance Error Amplifier Open-Loop Gain COMP Source Current COMP Sink Current VIN Quiescent Supply Current VIN Supply Current in Shutdown Switching Frequency Maximum Duty Cycle Minimum Duty Cycle Switch Current Limit Switch Saturation Voltage © 2005 Semtech Corp. Test Conditions Min Typ 1.3 Max 1.4 16 Unit V V V V % TA = 25°C -40°C < TA < 85°C 1.5V < VIN < 16V 1.224 1.217 1.242 1.260 1.267 0.01 40 60 49 80 nA µΩ−1 dB µA µA VFB = 1.1V VFB = 1.4V VSHDN = 1.5V, VCOMP = 0 ( Not Switching ) VSHDN = 0 1.3 85 5 5 1.1 10 1.5 90 0 2 2.8 220 350 1.6 18 1.7 mA µA MHz % % A mV ISW = 2A 2 www.semtech.com SC4501 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: VIN = 2V, SHDN = 1.5V, ROSC = 7.68kΩ, -40°C < T A = TJ < 85°C Parameter Switch Leakage Current Shutdown Threshold Voltage Shutdown Pin Current Soft-Start Charging Current www.DataSheet4U.com Test Conditions VSW = 5V Min Typ 0.01 Max 1 1.18 Unit µA V µA 1.02 VSHDN = 1.2V VSHDN = 0 VSS = 0.3V 1.1 -4.6 0 1.5 160 10 0.1 µA µA °C °C Thermal Shutdown Temperature Thermal Shutdown Hysteresis Pin Configurations TOP VIEW Ordering Information Device(1)(2) SC4501MLTRT SC4501MSETRT(3) SC4501EVB Package MLPD-10 -40 to 85°C MSOP-8-EDP Evaluation Board Temp. Range( TA) (10 Pin - MLPD, 3 x 3mm) Notes: (1) Only available in tape and reel packaging. A reel contains 3000 devices for MLP package and 2500 devices for MSOP. (2) Lead free product. This product is fully WEEE and RoHS compliant. (3) Contact factory for availability. TOP VIEW COMP 1 FB 2 SHDN 3 GND 4 8 SS 7 ROSC 6 IN 5 SW (8 Pin MSOP-EDP) © 2005 Semtech Corp. 3 www.semtech.com SC4501 POWER MANAGEMENT Pin Descriptions Block Diagram (MSOP-8) Pin 1 2 Pin Name COMP FB Pin Function The output of the internal transconductance error amplifier. This pin is used for loop co.


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