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LTC7149 Datasheet(PDF) 3 Page - Linear Technology |
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LTC7149 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 26 page  LTC7149 3 7149fa For more information www.linear.com/LTC7149 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Supply Operating Voltage Range 3.4 60 – |VOUT–| V VOUT– Output Operating Voltage Range (Note 3) –28V –0.05 V IVIN Input Quiescent Current Shutdown Mode; VRUN = 0V Burst Mode Operation FC Mode (Note 5) 18 440 1.4 30 600 2.5 µA µA mA IISET Reference Current VISET + |VOUT–| = 3.3V l 49.6 49.4 50 50 50.4 50.6 µA µA ∆VOUT(LOAD+LINE) Output Voltage Load + Line Regulation l 0.1 0.5 % VEA(OFFSET) Error Amp Input Offset VISET = 3.3V –5 5 mV gm (EA) Error Amplifier Transconductance VITH + |VOUT–| = 0.7V, VOUT– = –3.3V 400 550 700 µS ILSW Topside NMOS Switch Leakage 0.1 1 µA RSW Resistance to VOUT– 0.5 1 1.5 MΩ RDS(ON) Topside NMOS On-Resistance Bottom Side NMOS On-Resistance 110 50 m m tON(MIN) Minimum On-Time 60 ns VRUN RUN Input Rising RUN Hysteresis l 1.08 1.2 120 1.32 V mV IRUN RUN Input Current VRUN = 12V 0 10 nA VMODE/SYNC Burst Mode Operation FC Mode VMODE/SYNC = 0V 1.2 0.4 V V IMODE/SYNC MODE/SYNC Input Current VMODE/SYNC = 0V –8 –5 µA ILIM Peak Current Limit l 5.7 5.4 6 6 6.3 6.6 A A VUVLO VINTVCC + |VOUT–| Undervoltage Lockout VIN Rising l 2.4 2.65 2.9 V VUVLO(HYS) VINTVCC + |VOUT–| Undervoltage Lockout Hysteresis 200 mV VOVLO VIN Overvoltage Lockout Rising (VIN + |VOUT–|) 64 68 V VOVLO(HYS) VIN Overvoltage Lockout Hysteresis 2 4 V fOSC Oscillator Frequency RT = 100k l 0.92 1 1.08 MHz fSYNC SYNC Capture Range % of Programmed Frequency 50 150 % VINTVCC VINTVCC LDO Output Voltage (VINTVCC + |VOUT–|) VIN > 3.6V, VEXTVCC + |VOUT–| = 0V VIN > 5.0V, VEXTVCC + |VOUT–| > 3.2V 3.25 2.85 3.45 3 3.65 3.15 V V VEXTVCC EXTVCC Switchover Voltage VEXTVCC + |VOUT–| l 3.1 3.25 3.15 3.2 V V RVOUTSNS VOUTSNS Resistance to SVOUT– 80 100 120 kΩ IPGDFB PGDFB Leakage Current VPGDFB = 0.6V 0 100 nA OVPGDFB Output Overvoltage PGOOD Upper Threshold VPGFB + |VOUT–| Rising 0.63 0.645 0.66 V UVPGDFB Output Undervoltage PGOOD Lower Threshold VPGFB + |VOUT–| Falling 0.54 0.555 0.57 V ∆VPGDFB PGOOD Hysteresis 10 mV RPGOOD PGOOD Pull-Down Resistance 550 IPGOOD(LEAK) PGOOD Leakage Current VPGOOD = 3.3V 100 nA The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 24V, VEXTVCC = 0V unless otherwise specified. |
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