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LTC3728EG Datasheet(PDF) 3 Page - Linear Technology |
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LTC3728EG Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  3 LTC3728 3728fb SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS gm1, 2 Transconductance Amplifier gm ITH1, 2 = 1.2V; Sink/Source 5uA; (Note 3) 1.3 mmho gmGBW1, 2 Transconductance Amplifier GBW ITH1, 2 = 1.2V; (Note 3) 3 MHzIQ Input DC Supply Current (Note 4) Normal Mode VIN = 15V; EXTVCC Tied to VOUT1; VOUT1 = 5V 450 µA Shutdown VRUN/SS1, 2 = 0V 20 35 µA VFCB Forced Continuous Threshold ● 0.76 0.800 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.85V – 0.50 – 0.18 – 0.1 µA VBINHIBIT Burst Inhibit (Constant Frequency) Measured at FCB pin 4.3 4.8 V Threshold UVLO Undervoltage Lockout VIN Ramping Down ● 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VOSENSE1, 2 ● 0.84 0.86 0.88 V ISENSE Sense Pins Total Source Current (Each Channel); VSENSE1–, 2– = VSENSE1+, 2+ = 0V – 85 – 60 µA 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 1.9 V VRUN/SS1, 2 LT RUN/SS Pin Latchoff Arming Threshold VRUN/SS1, VRUN/SS2 Rising from 3V 3.8 4.5 V ISCL1, 2 RUN/SS Discharge Current Soft Short Condition VOSENSE1, 2 = 0.5V; 0.5 2 4 µA VRUN/SS1, 2 = 4.5V ISDLHO Shutdown Latch Disable Current VOSENSE1, 2 = 0.5V 1.6 5 µA VSENSE(MAX) Maximum Current Sense Threshold VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 5V 65 75 85 mV VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 5V ● 62 75 88 mV TG Transition Time: (Note 5) TG1, 2 tr Rise Time CLOAD = 3300pF 50 90 ns TG1, 2 tf Fall Time CLOAD = 3300pF 50 90 ns BG Transition Time: (Note 5) BG1, 2 tr Rise Time CLOAD = 3300pF 40 90 ns BG1, 2 tf Fall Time CLOAD = 3300pF 40 80 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 90 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 90 ns tON(MIN) Minimum On-Time Tested with a Square Wave (Note 6) 100 ns INTVCC Linear Regulator VINTVCC Internal VCC Voltage 6V < VIN < 30V, VEXTVCC = 4V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0 to 20mA, VEXTVCC = 4V 0.2 1.0 % VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 80 160 mV VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, EXTVCC Ramping Positive ● 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 0.2 V Oscillator and Phase-Locked Loop fNOM Nominal Frequency VPLLFLTR = 1.2V 360 400 440 kHz fLOW Lowest Frequency VPLLFLTR = 0V 230 260 290 kHz fHIGH Highest Frequency VPLLFLTR ≥ 2.4V 480 550 590 kHz RPLLIN PLLIN Input Resistance 50 k Ω IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC –15 µA Sourcing Capability fPLLIN > fOSC 15 µA The ● 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. ELECTRICAL CHARACTERISTICS |
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