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SC185LULTRT Datasheet(PDF) 3 Page - Semtech Corporation |
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SC185LULTRT Datasheet(HTML) 3 Page - Semtech Corporation |
3 / 18 page SC185 © 2010 Semtech Corp. Electrical Characteristics Exceeding the absolute maximum ratings may result in permanent damage to the device and/or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. Notes: (7) 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. (8) Tested according to JEDEC standard JESD22-A114-B. (9) Due to parasitic board inductance, the transient LX pin voltage at the point of measurement may appear larger than that which exists on silicon. The device is designed to tolerate the short duration transient voltages that will appear on the LX pin due to the deadtime diode conduction, for inductor currents up to the current limit setting of the device. Recommended Operating Conditions Supply Voltage PVIN and AVIN …………………… 2.9 to 5.5V Maximum Output Current ………………………………… 4.0A Temperature Range …………………………… -40 to +85˚C Input Capacitor ………………………………………… 22uF Output Capacitor ……………………… 47uF (or 2 x 22uF) Output Inductor ……………………………………… 1.0uH Thermal Resistance, Junction to Ambient(7) ………… 40 °C/W Thermal Resistance, Junction to Case …………… 7 °C/W Maximum Junction Temperature …………………… +150°C Storage Temperature Range ………………… -65 to +150 °C Thermal Information PVIN and AVIN Supply Voltages ………………… -0.3 to 6.0V LX Voltage(9) …………………… -0.3 to PVIN+0.3V, 6V Max VOUT Voltage …………………………… -0.3 to AVIN+0.3V CTLx pins Voltages ……………………… -0.3 to AVIN+0.3V Peak IR Reflow Temperature …………………………. 260°C ESD Protection Level(8) …………………………………. 3kV Unless specified: PVIN= AVIN= 5.0V, VOUT= 1.50V, C IN= 22µF, COUT= 2 x 22µF; L= 1.0µH; -40°C≤ TJ ≤ +125 °C; Unless otherwise noted typical values are TA= +25 °C. Parameter Symbol Conditions Min Typ Max Units Under-Voltage Lockout UVLO Rising AVIN, PVIN=AVIN 2.70 2.80 2.90 V Hysteresis 300 mV Output Voltage Tolerance(10) ΔV OUT PVIN= AVIN= 2.9 – 5.5V; I OUT=0A -1.25 +1.25 % Current Limit I LIMIT Peak LX current 5.0 6.0 7.0 A Supply Current I Q No load, MODE= High 12 mA No load, MODE= Low 100 µA Shutdown Current I SHDN EN= AGND 1 10 µA High Side Switch Resistance(11) R DSON_P I LX= 100mA, TJ= 25 °C 50 mΩ Low Side Switch Resistance(11) R DSON_N I LX= -100mA, TJ= 25 °C 35 L X Leakage Current (11) I LK(LX) PVIN= AVIN= 5.5V; LX= 0V; EN= AGND 1 10 µA PVIN= AVIN= 5.5V; LX= 5.0V; EN= AGND -20 -1 Load Regulation ΔV LOAD-REG PVIN= AVIN= 5.0V, MODE=Hi, I OUT=1mA – 4A ±0.3 % Oscillator Frequency f OSC 1.275 1.5 1.725 MHz Soft-Start Charging Current(11) I SS +5 µA Foldback Holding Current I CL_HOLD Average LX Current 1 A Absolute Maximum Ratings www.semtech.com 3 |
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