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SC4525DSETRT Datasheet(PDF) 4 Page - Semtech Corporation |
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SC4525DSETRT Datasheet(HTML) 4 Page - Semtech Corporation |
4 / 21 page © 2011 Semtech Corp. www.semtech.com SC4525D 4 Parameter Conditions Min Typ Max Units Minimum Switch On-time 150 ns Minimum Switch Off-time 100 150 ns Switch Leakage Current 10 µA Minimum Bootstrap Voltage I SW = -3.9A 1.8 2.3 V BST Pin Current I SW = -3.9A 100 150 mA Oscillator Switching Frequency R SET = 60.4kΩ 275 350 425 kHz Foldback Frequency R SET = 60.4kΩ, VFB = 0 35 65 100 kHz Soft Start and Overload Protection SS/EN Shutdown Threshold 0.2 0.3 0.4 V SS/EN Switching Threshold V FB = 0 V 0.95 1.2 1.4 V Soft-start Charging Current V SS/EN = 0 V 1.9 µA V SS/EN = 1.5 V 1.6 2.4 3.2 Soft-start Discharging Current 1.5 µA Hiccup Arming SS/EN Voltage V SS/EN Rising 2.15 V Hiccup SS/EN Overload Threshold V SS/EN Falling 1.9 V Hiccup Retry SS/EN Voltage V SS/EN Falling 0.6 1.0 1.2 V Over Temperature Protection Thermal Shutdown Temperature 165 °C Thermal Shutdown Hysteresis 10 °C Note 1: Switch current limit does not vary with duty cycle. Electrical Characteristics (Cont.) Unless otherwise noted, V IN = 12V, VBST = 15V, VSS = 2.2V, -40°C < TA = TJ < 125°C, RSET = 60.4kΩ. |
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