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LT4256-2CS8 Datasheet(PDF) 2 Page - Linear Technology |
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LT4256-2CS8 Datasheet(HTML) 2 Page - Linear Technology |
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2 / 16 page  LT4256-1/LT4256-2 2 425612f (Note 1) Supply Voltage (VCC) ................................ – 0.3 to 100V Input Voltage (SENSE, PWRGD) ............... – 0.3 to 100V Input Voltage (GATE) (Note 2) ........ – 0.3V to VCC + 10V Maximum Input Current (GATE) ......................... 200 µA Input Voltage (FB, UV) ................................ – 0.3 to 44V Input Voltage (TIMER) ............................. – 0.3V to 4.3V Maximum Input Current (TIMER) ....................... 100 µA Operating Temperature LT4256C ................................................. 0 °C to 70°C LT4256I ............................................. – 40 °C to 85°C Storage Temperature Range ................ – 65 °C to 150°C Lead Temperature (Soldering, 10 sec)................. 300 °C ABSOLUTE AXI U RATI GS Consult LTC Marketing for parts specified with wider operating temperature ranges. PACKAGE/ORDER I FOR ATIO ORDER PART NUMBER S8 PART MARKING 42561 42561I 42562 42562I LT4256-1CS8 LT4256-1IS8 LT4256-2CS8 LT4256-2IS8 TJMAX = 125°C, θJA = 110°C/W ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 48V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCC Operating Voltage q 10.8 80 V ICC Operating Current 1.8 3.9 mA VUVLH Undervoltage Threshold VCC Low-to-High Transition q 3.96 4 4.04 V VUVHYS Hysteresis 0.25 0.4 0.55 V IINUV UV Input Current UV ≥ 1.2V –0.1 –1 µA UV = 0V –1.5 –3 µA VSENSETRIP SENSE Pin Trip Voltage (VCC – VSENSE) FB = 0V q 5.5 14 22 mV FB ≥ 2V q 45 55 65 mV IINSNS SENSE Pin Input Current VSENSE = VCC 40 70 µA IPU GATE Pull-Up Current Charge Pump On, ∆VGATE = 7V q –16 – 30 – 55 µA IPD GATE Pull-Down Current Any Fault, VGATE = 3V 40 62 80 mA ∆VGATE External N-Channel Gate Drive (Note 2) VGATE – VCC, 10.8V ≤ VCC ≤ 20V q 4.5 8.8 12.5 V 20V ≤ VCC ≤ 80V q 10 11.6 12.8 V VFB FB Voltage Threshold FB High-to-Low Transition q 3.95 3.99 4.03 V FB Low-to-High Transition q 4.2 4.45 4.65 V VFBHYS FB Hysteresis Voltage 0.3 0.45 0.6 V VOLPGD PWRGD Output Low Voltage IO = 1.6mA 0.25 0.4 V IO = 5mA 0.6 1 V IPWRGD PWRGD Pin Leakage Current VPWRGD = 80V 0.1 1 µA IINFB FB Input Current FB = 4.5V –0.1 – 1 µA ITIMERPU TIMER Pull-Up Current q – 85 – 115 –145 µA ITIMERPD TIMER Pull-Down Current q 1.5 3 5 µA VTHTIMER TIMER Shut-Down Threshold CTIMER = 10nF q 4.3 4.65 5 V DTIMER Duty Cycle (RETRY Mode) q 1.5 3 4.5 % 1 2 3 4 8 7 6 5 TOP VIEW VCC SENSE GATE TIMER UV FB PWRGD GND S8 PACKAGE 8-LEAD PLASTIC SO |
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