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SC4509 Datasheet(PDF) 2 Page - Semtech Corporation |
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SC4509 Datasheet(HTML) 2 Page - Semtech Corporation |
2 / 15 page © 2007 Semtech Corp. SC4509 www.semtech.com PRELIMINARY POWER MANAGEMENT 2 Absolute Maximum Rating Electrical Characteristics Parameter Symbol Maximum Units Input Supply Voltage V IN -0.3 to 20 V SW Voltage V SW -0.3 to 30 V Maximum Output Voltage V OUT 30 V Feedback Voltage V FB -0.3 to 20 V EN/SS Voltage V EN/SS -0.3 to V IN + 0.3 V Maximum Junction Temperature T J 125 °C Storage Temperature Range T STG -65 to +150 °C Thermal Impedance Junction to Ambient(1) MLPD-W8 θ JA 78 C/W SOT23-6 165 Lead Temperature (Soldering), 10s (SOT23-6 package only) T LEAD 300 °C Peak IR Flow Temperature, (10-40sec) T PKG 260 °C ESD Rating (Human Body Model)(2) V ESD 2kV 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. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability. Unless specified: V IN = VEN/SS = 3.6V; CIN = 1μF; COUT = 0.22μF; L = 22μH; unless otherwise noted, TA = +25°C for Typ, -40ºC to 85°C for Min and Max. Parameter Symbol Conditions Min Typ Max Units Input Voltage V IN 2.7 10 V Quiescent Current I Q No switching 2.6 3.3 mA Feedback Voltage V FB 182 199 216 mV Feedback Pin Bias Current I QFB 35 100 nA Switching Frequency f OSC T A=25 °C 1.0 1.2 1.4 MHz Maximum Output Voltage V OUT 20 V Switch Saturation Voltage V CESAT I SW = 85mA; TA=25 °C 160 300 mV Maximum Duty Cycle D MAX V FB = GND 90 % Switch Current Limit I cl I LOAD = 0; TA=25 °C 300 500 700 mA Switch Leakage Current I LKG V SW = 5V; VOUT = Open 0.01 5.0 μA Shutdown Current I SHD V EN/SS = GND; VIN = 3V; VOUT = Open 3 5 μA PWM Dimming Frequency(1) f DIM 1 10 kHz EN/SS Threshold Low V IL 50 mV EN/SS Threshold High V IH 1.8 V Note: 1) Calculated from package in still air, mounted to 3”x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. 2) Tested in accordance to JEDEC standard JESD22-A114B. |
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