Datasheet LTC7149 (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | 60V, 4A Synchronous Step-Down Regulator for Inverting Outputs |
| Páginas / Página | 26 / 3 — The. denotes the specifications which apply over the specified operating |
| Formato / tamaño de archivo | PDF / 482 Kb |
| Idioma del documento | Inglés |
The. denotes the specifications which apply over the specified operating
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LTC7149 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 = 24V, VEXTVCC = 0V unless otherwise specified. 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 18 30 µA Burst Mode Operation 440 600 µA FC Mode (Note 5) 1.4 2.5 mA IISET Reference Current VISET + |VOUT –| = 3.3V 49.6 50 50.4 µA l 49.4 50 50.6 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, 400 550 700 µS VOUT – = –3.3V ILSW Topside NMOS Switch Leakage 0.1 1 µA R – SW Resistance to VOUT 0.5 1 1.5 MΩ RDS(ON) Topside NMOS On-Resistance 110 mΩ Bottom Side NMOS On-Resistance 50 mΩ tON(MIN) Minimum On-Time 60 ns VRUN RUN Input Rising l 1.08 1.2 1.32 V RUN Hysteresis 120 mV IRUN RUN Input Current VRUN = 12V 0 10 nA VMODE/SYNC Burst Mode Operation VMODE/SYNC = 0V 0.4 V FC Mode 1.2 V IMODE/SYNC MODE/SYNC Input Current VMODE/SYNC = 0V –8 –5 µA ILIM Peak Current Limit 5.7 6 6.3 A l 5.4 6 6.6 A VUVLO VINTVCC + |VOUT –| Undervoltage Lockout VIN Rising l 2.4 2.65 2.9 V VUVLO(HYS) VINTVCC + |VOUT –| Undervoltage Lockout 200 mV Hysteresis VOVLO VIN Overvoltage Lockout Rising (VIN + |VOUT –|) 64 68 V VOVLO(HYS) VIN Overvoltage Lockout Hysteresis 2 4 V fOSC Oscillator Frequency RT = 100kΩ 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 3.25 3.45 3.65 V VIN > 5.0V, VEXTVCC + |VOUT –| > 3.2V 2.85 3 3.15 V VEXTVCC EXTVCC Switchover Voltage VEXTVCC + |VOUT –| 3.1 3.15 3.2 V l 3.25 V R – VOUTSNS 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 Ω IPGOOD(LEAK) PGOOD Leakage Current VPGOOD = 3.3V 100 nA 7149fa For more information www.linear.com/LTC7149 3
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. 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 18 30 µA Burst Mode Operation 440 600 µA FC Mode (Note 5) 1.4 2.5 mA IISET Reference Current VISET + |VOUT –| = 3.3V 49.6 50 50.4 µA l 49.4 50 50.6 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, 400 550 700 µS VOUT – = –3.3V ILSW Topside NMOS Switch Leakage 0.1 1 µA R – SW Resistance to VOUT 0.5 1 1.5 MΩ RDS(ON) Topside NMOS On-Resistance 110 mΩ Bottom Side NMOS On-Resistance 50 mΩ tON(MIN) Minimum On-Time 60 ns VRUN RUN Input Rising l 1.08 1.2 1.32 V RUN Hysteresis 120 mV IRUN RUN Input Current VRUN = 12V 0 10 nA VMODE/SYNC Burst Mode Operation VMODE/SYNC = 0V 0.4 V FC Mode 1.2 V IMODE/SYNC MODE/SYNC Input Current VMODE/SYNC = 0V –8 –5 µA ILIM Peak Current Limit 5.7 6 6.3 A l 5.4 6 6.6 A VUVLO VINTVCC + |VOUT –| Undervoltage Lockout VIN Rising l 2.4 2.65 2.9 V VUVLO(HYS) VINTVCC + |VOUT –| Undervoltage Lockout 200 mV Hysteresis VOVLO VIN Overvoltage Lockout Rising (VIN + |VOUT –|) 64 68 V VOVLO(HYS) VIN Overvoltage Lockout Hysteresis 2 4 V fOSC Oscillator Frequency RT = 100kΩ 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 3.25 3.45 3.65 V VIN > 5.0V, VEXTVCC + |VOUT –| > 3.2V 2.85 3 3.15 V VEXTVCC EXTVCC Switchover Voltage VEXTVCC + |VOUT –| 3.1 3.15 3.2 V l 3.25 V R – VOUTSNS 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 Ω IPGOOD(LEAK) PGOOD Leakage Current VPGOOD = 3.3V 100 nA 7149fa For more information www.linear.com/LTC7149 3