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750811248 Datasheet(PDF) 3 Page - Linear Technology |
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750811248 Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page LT3798 3 3798f ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3798E is guaranteed to meet specified performance from 0°C to 125°C junction temperature. Specification over the –40°C and The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 18V, INTVCC = 11V, unless otherwise noted. 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The 3798I is guaranteed to meet specified performance from –40°C to 125°C operating junction temperature range. Note 3: Current flows out of the FB pin. PARAMETER CONDITIONS MIN TYP MAX UNITS SENSE Current Limit Threshold VIN_SENSE = 150μA 96 102 107 mV Minimum SENSE Current Limit Threshold VIN_SENSE = 34μA 14 mV Minimum SENSE Current Limit Threshold VIN_SENSE = 21μA 4 mV SENSE Input Bias Current Current Out of Pin, SENSE = 0V 15 μA FB Voltage l 1.22 1.25 1.28 V FB voltage Line Regulation 10V < VIN < 35V 0.01 0.03 %/V FB Pin Bias Current (Note 3), FB = 1V 4.05 4.25 4.4 μA FB Error Amplifier Voltage Gain ΔVVC/ΔVFB, CTRL1=1V, CTRL2=2V, CTRL3=2V 180 V/V FB Error Amplifier Transconductance ΔI = 5μA 170 UMHOS Current Error Amplifier Voltage Gain ΔVCOMP+/ΔVCOMP–, CTRL1 = 1V, CTRL2 = 2V, CTRL3 = 2V 100 V/V Current Error Amplifier Transconductance ΔI = 5μA 50 UMHOS Current Loop Voltage Gain ΔVCTRL/ΔVSENSE,1000pF Cap from COMP+ to COMP– 21 V/V DCM Current Turn-On Threshold Current Out of Pin 80 μA Maximum Oscillator Frequency COMP+ = 0.95V, VIN_SENSE = 150μA 150 kHz Minimum Oscillator Frequency COMP+ = 0V, VFB <VOVP 4kHz Minimum Oscillator Frequency COMP+ = 0V, VFB >VOVP 0.5 kHz Backup Oscillator Frequency 20 kHz Linear Regulator INTVCC Regulation Voltage No Load 9.8 10 10.4 V Dropout (VIN-INTVCC)IINTVCC = –10mA, VIN = 10V 500 900 mV Current Limit Below Undervoltage Threshold 12 25 mA Current Limit Above Undervoltage Threshold 80 120 mA Gate Driver tr GATE Driver Output Rise Time CL = 3300pF, 10% to 90% 18 ns tf GATE Driver Output Fall Time CL = 3300pF, 90% to 10% 18 ns GATE Output Low (VOL) 0.01 V GATE Output High (VOH) INTVCC- 50mV V |
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