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LTC3707EGN-PBF Datasheet(PDF) 3 Page - Linear Technology |
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LTC3707EGN-PBF Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3707 3 3707fb ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS gmGBW1, 2 Transconductance Amplifier GBW ITH1, 2 = 1.2V; (Note 4) 3 MHz IQ Input DC Supply Current Normal Mode Standby Shutdown (Note 5) EXTVCC Tied to VOUT1 = 5V VRUN/SS1, 2 = 0V, VSTBYMD > 2V VRUN.SS1, 2 = 0V, VSTBYMD = Open 350 125 20 35 μA μA μA VFCB Forced Continuous Threshold l 0.76 0.800 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.85V –0.30 –0.18 –0.1 μA VBINHIBIT Burst Inhibit (Constant Frequency) Threshold Measured at FCB pin 4.3 4.8 V UVLO Undervoltage Lockout VIN Ramping Down l 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VOSENSE1, 2 l 0.84 0.86 0.88 V ISENSE Sense Pins Total Source Current (Each Channel); VSENSE1–, 2– = VSENSE1+, 2+ = 0V –90 –60 μA VSTBYMD MS Master Shutdown Threshold VSTBYMD Ramping Down 0.4 0.6 V VSTBYMD KA Keep-Alive Power On-Threshold VSTBYMD Ramping Up, RUNSS1, 2 = 0V 1.5 2 V DFMAX Maximum Duty Factor In Dropout 98 99.4 % IRUN/SS1, 2 Soft-Start Charge Current VRUN/SS1, 2 = 1.9V 0.5 1.2 μA VRUN/SS1, 2 ON RUN/SS Pin ON Threshold VRUN/SS1, VRUN/SS2, Rising 1.0 1.5 2.0 V VRUN/SS1, 2 LT RUN/SS Pin Latchoff Arming Threshold VRUN/SS1, VRUN/SS2, Rising from 3V 4.1 4.75 V ISCL1, 2 RUN/SS Discharge Current Soft Short Condition VOSENSE1, 2 = 0.5V; VRUN/SS1, 2 = 4.5V 0.5 2 4 μA ISDLHO Shutdown Latch Disable Current VOSENSE1, 2 = 0.5V 1.6 5 μA VSENSE(MAX) Maximum Current Sense Threshold VOSENSE1, 2 = 0.7V, VOSENSE1–, 2– = 5V l 65 62 75 75 85 88 mV mV TG1, 2 tr TG1, 2 tf TG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 60 60 110 110 ns ns BG1, 2 tr BG1, 2 tf BG Transition Time: Rise Time Fall Time (Note 6) CLOAD = 3300pF CLOAD = 3300pF 50 50 110 100 ns ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 80 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 80 ns tON(MIN) Minimum On-Time Tested with a Square Wave (Note 7) 180 ns INTVCC Linear Regulator VINTVCC Internal VCC Voltage 6V < VIN < 30V, VEXTCC = 4V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0 to 20mA, VEXTVCC = 4V 0.2 2.0 % VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 100 200 mV VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, EXTVCC Ramping Positive l 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 0.2 V Oscillator fOSC Oscillator Frequency VFREQSET = Open (Note 8) 190 220 250 kHz fLOW Lowest Frequency VFREQSET = 0V 120 140 160 kHz The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. |
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