Datasheet LTC3811 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | High Speed Dual, Multiphase Step-Down DC/DC Controller |
| Pages / Page | 48 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 552 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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Text Version of Document
LTC3811
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TJ = 25°C. VIN = 12V, MODE/SYNC = 0V, unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VIN Operating Input Voltage Range 4.5 30 V IQ Total Quiescent Supply Current Continuous Mode (Note 4) VFB1,2 = 0.7V ● 10.5 20 mA Shutdown Mode VRUN1,2 = 0V ● 20 40 μA
RUN Pin ON/OFF Control
IRUN RUN Pin Input Leakage VRUN1,2 = 3.3V –1 1 μA VIL(RUN) Low Level RUN Input Threshold 0.3 V VIH(RUN) High Level RUN Input Threshold 1.8 V
Error Amplifi er Characteristics (Both Channels)
VFB1, VFB2 Feedback Voltage Accuracy (Note 5) 598 600 602 mV ● 597 603 mV IFB1, IFB2 Feedback Pin Input Current VCOMP = 1.25V (Note 5) –100 100 nA ΔVFB/ΔVIN Line Regulation 4.5V ≤ VIN ≤ 30V (Note 5) ● 0.002 0.02 %/V ΔVFB/ΔVCOMP Load Regulation ΔVCOMP = 1.25V to 1.5V (Note 5) ● –0.1 –0.01 % f0dB(EA) Error Amplifi er Unity Gain Crossover (Note 6) 8 MHz Frequency VOH(EA) Error Amplifi er Maximum Output VFB = 0.54V, No Load 2.6 V Voltage (Internally Clamped) VOL(EA) Error Amplifi er Minimum Output Voltage VFB = 0.66V, No Load 10 mV VFB(OFF) FB Voltage Threshold to Disable Error VINTVCC – VFB 0.3 V Amplifi er Output
Soft-Start/Tracking
ISS1, ISS2 SS/TRACK1, SS/TRACK2 Charging VSS/TRACK1 = VSS/TRACK2 = 0.3V –2.5 μA Currents RSS1, RSS2 SS/TRACK1, SS/TRACK2 Pull-Down VRUN1 = VRUN2 = 0V 1 kΩ Resistance in Shutdown
Differential Amplifi er
AV Differential Mode Gain, ΔVDIFF/IN = 1V to 3.5V, IDIFF/OUT = –100μA 0.995 1.000 1.005 V/V ΔVDIFF/OUT/ΔVDIFF/IN VOS(DIFF) Output Offset Voltage, VDIFF/IN+ = 1.25V, VDIFF/IN– = 0V, –6 6 mV VDIFF/OUT – VDIFF/IN+ IDIFF/OUT = –100μA RIN Input Resistance Measured at VDIFF/IN+ 160 kΩ PSRRDIFF Power Supply Rejection Ratio 7V ≤ VIN ≤ 30V 100 dB VDM(DIFF) Maximum Differential Mode Input VDIFF/IN+ – VDIFF/IN–, Measured at 5.5 V Voltage VDIFF/OUT, IDIFF/OUT = –100μA IMAX+ Maximum Sink Current 2 mA IMAX– Maximum Source Current –2 mA f0dB(DIFF) Unity Gain Bandwidth (Note 6) 8 MHz
Current Comparators
VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.575V, VCM = 1.25V (VSENSE+ – VSENSE–) VRNG = 0V 14 24 34 mV VRNG = INTVCC 32.5 50 67.5 mV VRNG = 2V 60 85 110 mV VSENSE(MIN) Minimum Current Sense Threshold VFB = 0.625V, VCM = 1.25V (VSENSE+ – VSENSE–) VRNG = 0V –21 mV VRNG = INTVCC –41 mV VRNG = 2V –67 mV 3811f 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating junction temperature range, otherwise specifi cations are at TJ = 25°C. VIN = 12V, MODE/SYNC = 0V, unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
VIN Operating Input Voltage Range 4.5 30 V IQ Total Quiescent Supply Current Continuous Mode (Note 4) VFB1,2 = 0.7V ● 10.5 20 mA Shutdown Mode VRUN1,2 = 0V ● 20 40 μA
RUN Pin ON/OFF Control
IRUN RUN Pin Input Leakage VRUN1,2 = 3.3V –1 1 μA VIL(RUN) Low Level RUN Input Threshold 0.3 V VIH(RUN) High Level RUN Input Threshold 1.8 V
Error Amplifi er Characteristics (Both Channels)
VFB1, VFB2 Feedback Voltage Accuracy (Note 5) 598 600 602 mV ● 597 603 mV IFB1, IFB2 Feedback Pin Input Current VCOMP = 1.25V (Note 5) –100 100 nA ΔVFB/ΔVIN Line Regulation 4.5V ≤ VIN ≤ 30V (Note 5) ● 0.002 0.02 %/V ΔVFB/ΔVCOMP Load Regulation ΔVCOMP = 1.25V to 1.5V (Note 5) ● –0.1 –0.01 % f0dB(EA) Error Amplifi er Unity Gain Crossover (Note 6) 8 MHz Frequency VOH(EA) Error Amplifi er Maximum Output VFB = 0.54V, No Load 2.6 V Voltage (Internally Clamped) VOL(EA) Error Amplifi er Minimum Output Voltage VFB = 0.66V, No Load 10 mV VFB(OFF) FB Voltage Threshold to Disable Error VINTVCC – VFB 0.3 V Amplifi er Output
Soft-Start/Tracking
ISS1, ISS2 SS/TRACK1, SS/TRACK2 Charging VSS/TRACK1 = VSS/TRACK2 = 0.3V –2.5 μA Currents RSS1, RSS2 SS/TRACK1, SS/TRACK2 Pull-Down VRUN1 = VRUN2 = 0V 1 kΩ Resistance in Shutdown
Differential Amplifi er
AV Differential Mode Gain, ΔVDIFF/IN = 1V to 3.5V, IDIFF/OUT = –100μA 0.995 1.000 1.005 V/V ΔVDIFF/OUT/ΔVDIFF/IN VOS(DIFF) Output Offset Voltage, VDIFF/IN+ = 1.25V, VDIFF/IN– = 0V, –6 6 mV VDIFF/OUT – VDIFF/IN+ IDIFF/OUT = –100μA RIN Input Resistance Measured at VDIFF/IN+ 160 kΩ PSRRDIFF Power Supply Rejection Ratio 7V ≤ VIN ≤ 30V 100 dB VDM(DIFF) Maximum Differential Mode Input VDIFF/IN+ – VDIFF/IN–, Measured at 5.5 V Voltage VDIFF/OUT, IDIFF/OUT = –100μA IMAX+ Maximum Sink Current 2 mA IMAX– Maximum Source Current –2 mA f0dB(DIFF) Unity Gain Bandwidth (Note 6) 8 MHz
Current Comparators
VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.575V, VCM = 1.25V (VSENSE+ – VSENSE–) VRNG = 0V 14 24 34 mV VRNG = INTVCC 32.5 50 67.5 mV VRNG = 2V 60 85 110 mV VSENSE(MIN) Minimum Current Sense Threshold VFB = 0.625V, VCM = 1.25V (VSENSE+ – VSENSE–) VRNG = 0V –21 mV VRNG = INTVCC –41 mV VRNG = 2V –67 mV 3811f 3
