LT1961 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperaturerange, otherwise specifications are at TA = 25 ° C. VIN = 15V, VC = 0.8V, SHDN, SYNC and switch open unless otherwise noted.PARAMETERCONDITIONMINTYPMAXUNITS FB Input Current ● 0 – 0.2 – 0.4 μA FB to VC Voltage Gain 0.4V < VC < 0.9V 150 350 FB to VC Transconductance ΔIVC = ±10μA ● 500 850 1300 μMho VC Pin Source Current VFB = 1V ● – 85 – 120 – 165 μA VC Pin Sink Current VFB = 1.4V ● 70 110 165 μA VC Pin to Switch Current Transconductance 2.4 A/V VC Pin Minimum Switching Threshold Duty Cycle = 0% 0.3 V VC Pin 1.5A ISW Threshold 0.9 V Maximum Switch Duty Cycle VC = 1.2V, ISW = 100mA ● 80 90 % VC = 1.2V, ISW = 1A, 25°C ≤ TA ≤ 125°C 75 80 % VC = 1.2V, ISW = 1A, TA ≤ 25°C 70 75 % SHDN Threshold Voltage ● 1.28 1.35 1.42 V SHDN Input Current (Shutting Down) SHDN = 60mV Above Threshold ● – 7 –10 –13 μA SHDN Threshold Current Hysteresis SHDN = 100mV Below Threshold 4 7 10 μA SYNC Threshold Voltage 1.5 2.2 V SYNC Input Frequency 1.5 2 MHz SYNC Pin Resistance ISYNC = 1mA 20 kΩ Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: Minimum input voltage is defined as the voltage where the may cause permanent damage to the device. Exposure to any Absolute internal regulator enters lockout. Actual minimum input voltage to Maximum Rating condition for extended periods may affect device maintain a regulated output will depend on output voltage and load reliability and lifetime. current. See Applications Information. Note 2: The LT1961E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the – 40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT1961I is guaranteed over the – 40ºC to 125ºC operating junction temperature range. 1961fa 3
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