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LTC3875 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3875 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 46 page  LTC3875 4 3875fb For more information www.linear.com/LTC3875 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VSENSE(MAX)(DC) Maximum Current Sense Threshold with SNSD+ Pin to VOUT 0°C to 85°C VSNS–(s) = 1.2V, ILIM = 0V VSNS–(s) = 1.2V, ILIM = 1/4 INTVCC VSNS–(s) = 1.2V, ILIM = 1/2 INTVCC VSNS–(s) = 1.2V, ILIM = 3/4 INTVCC VSNS–(s) = 1.2V, ILIM = INTVCC 9 14 19 23.5 28.5 10 15 20 25 30 11 16 21 26.5 31.5 mV mV mV mV mV –40°C to 125°C VSNS–(s) = 1.2V, ILIM = 0V VSNS–(s) = 1.2V, ILIM = 1/4 INTVCC VSNS–(s) = 1.2V, ILIM = 1/2 INTVCC VSNS–(s) = 1.2V, ILIM = 3/4 INTVCC VSNS–(s) = 1.2V, ILIM = INTVCC l l l l l 8.5 13.5 17.5 22 26.5 10 15 20 25 30 11.5 16.5 22.5 28 33.5 mV mV mV mV mV VSENSE(MAX)(NODE) Maximum Current Sense Threshold with SNSD+ Pin to GND VSNS–(s) = 1.2V, ILIM = 0V VSNS–(s) = 1.2V, ILIM = 1/4 INTVCC VSNS–(s) = 1.2V, ILIM = 1/2 INTVCC VSNS–(s) = 1.2V, ILIM = 3/4 INTVCC VSNS–(s) = 1.2V, ILIM = INTVCC l l l l l 45 70 95 117.5 142.5 50 75 100 125 150 55 80 105 132.5 157.5 mV mV mV mV mV IMISMATCH Channel-to-Channel Current Mismatch ILIM = Float, ENTMPB = Float (Thermal Balance Disabled) 5 % IQ Input DC Supply Current Normal Mode Shutdown (Note 5) VIN = 15V (without EXTVCC Enabled) VRUN1,2 = 0V 7 40 10 60 mA µA UVLO Undervoltage Lockout VINTVCC Ramping Down 3.5 3.7 4.0 V UVLO Hyst UVLO Hysteresis 0.5 V VOVL Feedback Overvoltage Lockout Measured at VOSNS1,2+ l 0.625 0.645 0.665 V ITK/SS1,2 Soft-Start Charge Current VTK/SS1,2 = 0V l 1.0 1.25 1.5 µA VRUN1,2 RUN Pin On Threshold VRUN1, VRUN2 Rising l 1.1 1.22 1.35 V VRUN1,2HYS RUN Pin On Hysteresis 80 mV Driver Functions TG1,2 tr TG1,2 tf TG Transition Time Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns BG1,2 tr BG1,2 tf BG Transition Time Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 25 25 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 30 ns tON(MIN) Minimum On-Time (Note 7) 90 ns |
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