Datasheet LTC3823 (Analog Devices) - 3
| Hersteller | Analog Devices |
| Beschreibung | Fast No RSENSE Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL |
| Seiten / Seite | 26 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| Dateiformat / Größe | PDF / 315 Kb |
| Dokumentensprache | Englisch |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC3823
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 15V unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
IQ Input DC Supply Current Normal Operation 1400 2200 μA Shutdown Supply Current 30 50 μA VFB Feedback Voltage Accuracy (Note 3) ITH = 1.2V (0°C to 85°C) 0.596 0.6 0.604 V ITH = 1.2V l 0.594 0.6 0.606 V VFB(LINEREG) Feedback Voltage Line Regulation VIN = 4.5V to 30V, ITH = 1.2V (Note 3) 0.002 %/V VFB(LOADREG) Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 3) –0.04 –0.3 % VRUN RUN Pin On Threshold VRUN Rising 1 1.5 1.9 V ISS/TRACK Soft-Start Charge Current VSS/TRACK = 0V –1.3 –1.7 –2.3 μA IFB Feedback Pin Input Current –100 –20 100 nA gm(EA) Error Amplifi er Transconductance ITH = 1.2V (Note 3) l 1.65 mS VFCB Forced Continuous Threshold l 0.57 0.6 0.63 V IFCB Forced Continuous Pin Current VFCB = 0V –1 –2 μA tON On-Time ION = –60μA, VON = 1.5V 210 250 290 ns ION = –60μA, VON = 0V 80 115 150 ns tON(MIN) Minimum On-Time ION = –180μA, VON = 0V 50 100 ns tOFF(MIN) Minimum Off-Time 280 400 ns VSENSE(MAX) Maximum Current Sense Threshold VRNG = 1V, VFB = 570mV (0°C to 85°C) 120 140 160 mV VRNG = 0V, VFB = 570mV (0°C to 85°C) 50 70 85 mV VRNG = INTVCC, VFB = 570mV (0°C to 85°C) 240 280 320 mV VSENSE(MIN) Minimum Current Sense Threshold VRNG = 1V, VFB = 630mV – 60 mV VRNG = 0V, VFB = 630mV – 30 mV VRNG = INTVCC, VFB = 630mV –120 mV ΔVFB(OV) Output Overvoltage Fault Threshold Offset 8 11 14 % VIN(UVLO+) Undervoltage Lockout VIN Falling 3.1 3.4 V VIN(UVLO–) Undervoltage Lockout VIN Rising 3.9 4.1 V TG RUP TG Driver Pull-Up On-Resistance TG High 1.9 2.5 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low 1.2 2.5 Ω BG RUP BG Driver Pull-Up On-Resistance BG High 1.9 3 Ω BG RDOWN BG Driver Pull-Down On-Resistance BG Low 0.7 1.5 Ω TG tr TG Rise Time CLOAD = 3300pF 20 ns TG tf TG Fall Time CLOAD = 3300pF 20 ns BG tr BG Rise Time CLOAD = 3300pF 20 ns BG tf BG Fall Time CLOAD = 3300pF 20 ns
Internal VCC Regulation
VINTVCC Internal VCC Voltage 6V < VIN < 36V l 4.75 5 5.45 V ΔVLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA – 0.1 ±2 %
Phase-Locked Loop
RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Sink Current fPLLIN < fO –15 μA Phase Detector Source Current fPLLIN > fO 15 μA 3823fd 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 15V unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
IQ Input DC Supply Current Normal Operation 1400 2200 μA Shutdown Supply Current 30 50 μA VFB Feedback Voltage Accuracy (Note 3) ITH = 1.2V (0°C to 85°C) 0.596 0.6 0.604 V ITH = 1.2V l 0.594 0.6 0.606 V VFB(LINEREG) Feedback Voltage Line Regulation VIN = 4.5V to 30V, ITH = 1.2V (Note 3) 0.002 %/V VFB(LOADREG) Feedback Voltage Load Regulation ITH = 0.5V to 1.9V (Note 3) –0.04 –0.3 % VRUN RUN Pin On Threshold VRUN Rising 1 1.5 1.9 V ISS/TRACK Soft-Start Charge Current VSS/TRACK = 0V –1.3 –1.7 –2.3 μA IFB Feedback Pin Input Current –100 –20 100 nA gm(EA) Error Amplifi er Transconductance ITH = 1.2V (Note 3) l 1.65 mS VFCB Forced Continuous Threshold l 0.57 0.6 0.63 V IFCB Forced Continuous Pin Current VFCB = 0V –1 –2 μA tON On-Time ION = –60μA, VON = 1.5V 210 250 290 ns ION = –60μA, VON = 0V 80 115 150 ns tON(MIN) Minimum On-Time ION = –180μA, VON = 0V 50 100 ns tOFF(MIN) Minimum Off-Time 280 400 ns VSENSE(MAX) Maximum Current Sense Threshold VRNG = 1V, VFB = 570mV (0°C to 85°C) 120 140 160 mV VRNG = 0V, VFB = 570mV (0°C to 85°C) 50 70 85 mV VRNG = INTVCC, VFB = 570mV (0°C to 85°C) 240 280 320 mV VSENSE(MIN) Minimum Current Sense Threshold VRNG = 1V, VFB = 630mV – 60 mV VRNG = 0V, VFB = 630mV – 30 mV VRNG = INTVCC, VFB = 630mV –120 mV ΔVFB(OV) Output Overvoltage Fault Threshold Offset 8 11 14 % VIN(UVLO+) Undervoltage Lockout VIN Falling 3.1 3.4 V VIN(UVLO–) Undervoltage Lockout VIN Rising 3.9 4.1 V TG RUP TG Driver Pull-Up On-Resistance TG High 1.9 2.5 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low 1.2 2.5 Ω BG RUP BG Driver Pull-Up On-Resistance BG High 1.9 3 Ω BG RDOWN BG Driver Pull-Down On-Resistance BG Low 0.7 1.5 Ω TG tr TG Rise Time CLOAD = 3300pF 20 ns TG tf TG Fall Time CLOAD = 3300pF 20 ns BG tr BG Rise Time CLOAD = 3300pF 20 ns BG tf BG Fall Time CLOAD = 3300pF 20 ns
Internal VCC Regulation
VINTVCC Internal VCC Voltage 6V < VIN < 36V l 4.75 5 5.45 V ΔVLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA – 0.1 ±2 %
Phase-Locked Loop
RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Sink Current fPLLIN < fO –15 μA Phase Detector Source Current fPLLIN > fO 15 μA 3823fd 3