LT3681 TheELECTRICAL CHARACTERISTICS ● denotes the specifi cations which apply over the full operatingtemperature range, otherwise specifi cations are at TA = 25°C. VIN = 10V, VRUNS/SS = 10V VBOOST = 15V, VBIAS = 3.3V unless otherwise noted. (Note 2)PARAMETERCONDITIONSMINTYPMAXUNITS Power Schottky Diode Forward Voltage IDA = 1A 0.50 V IDA = 2A 0.56 V Power Schottky Diode Leakage Current VDC-DA = 40V 100 μA Switching Frequency RT = 8.66k 2.5 2.8 3.1 MHz RT = 29.4k 1.25 1.4 1.55 MHz RT = 187k 250 300 350 kHz Minimum Switch Off-Time ● 130 200 nS Switch Current Limit Duty Cycle = 5% 3.2 3.8 4.4 A Switch VCESAT ISW = 2A 360 mV Boost Schottky Reverse Leakage VSW = 10V, VBIAS = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) ● 1.5 2.1 V BOOST Pin Current ISW = 1A 18 35 mA RUN/SS Pin Current VRUN/SS = 2.5V 5 10 μA RUN/SS Input Voltage High 2.5 V RUN/SS Input Voltage Low 0.2 V PG Threshold Offset from Feedback Voltage VFB Rising 122 mV PG Hysteresis 5 mV PG Leakage VPG = 5V 0.1 1 μA PG Sink Current VPG = 3V ● 100 600 μA Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: Bias current fl ows into the FB pin. may cause permanent damage to the device. Exposure to any Absolute Note 4: This is the minimum voltage across the boost capacitor needed to Maximum Rating condition for extended periods may affect device guarantee full saturation of the switch. reliability and lifetime. Note 2: The LT3681E is guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. 3681f 3
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