Datasheet LTC3773 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking |
| Pages / Page | 32 / 3 — ELECTRICAL CHARACTERISTICS. (Note 3) The. denotes the specifi cations … |
| File Format / Size | PDF / 485 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. (Note 3) The. denotes the specifi cations which apply over the full
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LTC3773
ELECTRICAL CHARACTERISTICS (Note 3) The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VCC = VDR = VBOOST = VSDB = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VFB Feedback Voltage VITH = 1.2V, 0°C ≤ T ≤ 85°C (Note 4) 0.594 0.600 0.606 V ● 0.591 0.600 0.609 V IVFB Feedback Pin Input Current 0 ≤ VFB ≤ 1V –15 –100 nA V – SENSEMAX Maximum Current Sense Threshold VFB = 0.55V, VTRACK = 1V, VSENSE = 2.5V 65 75 85 mV ● 60 75 90 mV VFBLOADREG Feedback Voltage Load Regulation Measured in Servo Loop (Note 4) ΔITH Voltage = 1.2V to 0.7V ● 0.15 0.5 % ΔITH Voltage = 1.2V to 2V ● –0.2 –0.5 % VFBLNREG Feedback Voltage Line Regulation VCC = 4.5V to 6V 0.01 %/V gm Transconductance Amplifi er gm VITH = 1.2V, Sink/Source 25μA (Note 4) ● 2.3 2.7 3.2 mmho fu Transconductance Amplifi er GBW VITH = 1.2V (Note 5) 3 MHz AERR Transconductance Amplifi er DC Gain VITH = 0.8V to 1.6V ● 50 56 dB VUVR VCC Undervoltage Reset VCC Ramping Positive 3.7 4.1 4.4 V Undervoltage Hysteresis 0.16 V VCC VCC Supply Voltage ● 4.5 5 6 V IVCC VCC Supply Current Normal Mode VCC = 5V 2.8 4 mA Shutdown VSDB = 0V 20 30 μA IVDR VDR Supply Current Normal Mode VDR = 5V (Note 6) 5 mA Shutdown VSDB = 0V 1 μA IBOOST VBOOST Supply Current Normal Mode VBOOST = 5V, VSW = 0V (Note 6) 1 mA Shutdown VSDB = 0V 1 μA ISDB SDB Source Current –1.5 μA SDB1, SDB2, SDB3 Source Content –0.5 μA VSDB SDB Power Up Threshold Ramping Positive ● 0.4 V SDB1 Pin CH1 ON Threshold ● 1.14 1.2 1.26 V SDB2 Pin CH2 ON Threshold ● 1.71 1.8 1.89 V SDB3 Pin CH3 ON Threshold ● 2.3 2.4 2.5 V Channel On Threshold Hysteresis –10 % I + – SENSE SENSE Pins Source Current VSENSE , VSENSE = 1.2V, Current at Each Pin –13 –20 μA DFMAX Maximum Duty Factor PLLFLTR Floats, In Dropout 97 98.5 % TG RUP TG Driver Pull-Up On-Resistance TG High, IOUT = 100mA (Note 7) 2.2 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low, IOUT = 100mA (Note 7) 1.8 Ω BG RUP BG Driver Pull-Up On-Resistance BG High, IOUT = 100mA (Note 7) 2.4 Ω BG RDOWN BG Driver Pull-Down On-Resistance BG Low, IOUT = 100mA (Note 7) 0.9 Ω TG/BG t1D Top Gate OFF to Bottom Gate ON Delay All Controllers 50 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate OFF to Top Gate ON Delay All Controllers 50 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time Tested with a Square Wave (Note 8) 130 ns
Tracking
ITRACK TRACK Pin Pull-Up Current VSDB = 5V, VTRACK = 0V –1 μA VFBTRACK VFB Voltage During Tracking VTRACK = 0.2V, VITH = 1.2V (Note 4) 180 200 220 mV VTRACK = 0.4V, VITH = 1.2V (Note 4) 380 400 420 mV 3773fb 3
ELECTRICAL CHARACTERISTICS (Note 3) The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VCC = VDR = VBOOST = VSDB = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VFB Feedback Voltage VITH = 1.2V, 0°C ≤ T ≤ 85°C (Note 4) 0.594 0.600 0.606 V ● 0.591 0.600 0.609 V IVFB Feedback Pin Input Current 0 ≤ VFB ≤ 1V –15 –100 nA V – SENSEMAX Maximum Current Sense Threshold VFB = 0.55V, VTRACK = 1V, VSENSE = 2.5V 65 75 85 mV ● 60 75 90 mV VFBLOADREG Feedback Voltage Load Regulation Measured in Servo Loop (Note 4) ΔITH Voltage = 1.2V to 0.7V ● 0.15 0.5 % ΔITH Voltage = 1.2V to 2V ● –0.2 –0.5 % VFBLNREG Feedback Voltage Line Regulation VCC = 4.5V to 6V 0.01 %/V gm Transconductance Amplifi er gm VITH = 1.2V, Sink/Source 25μA (Note 4) ● 2.3 2.7 3.2 mmho fu Transconductance Amplifi er GBW VITH = 1.2V (Note 5) 3 MHz AERR Transconductance Amplifi er DC Gain VITH = 0.8V to 1.6V ● 50 56 dB VUVR VCC Undervoltage Reset VCC Ramping Positive 3.7 4.1 4.4 V Undervoltage Hysteresis 0.16 V VCC VCC Supply Voltage ● 4.5 5 6 V IVCC VCC Supply Current Normal Mode VCC = 5V 2.8 4 mA Shutdown VSDB = 0V 20 30 μA IVDR VDR Supply Current Normal Mode VDR = 5V (Note 6) 5 mA Shutdown VSDB = 0V 1 μA IBOOST VBOOST Supply Current Normal Mode VBOOST = 5V, VSW = 0V (Note 6) 1 mA Shutdown VSDB = 0V 1 μA ISDB SDB Source Current –1.5 μA SDB1, SDB2, SDB3 Source Content –0.5 μA VSDB SDB Power Up Threshold Ramping Positive ● 0.4 V SDB1 Pin CH1 ON Threshold ● 1.14 1.2 1.26 V SDB2 Pin CH2 ON Threshold ● 1.71 1.8 1.89 V SDB3 Pin CH3 ON Threshold ● 2.3 2.4 2.5 V Channel On Threshold Hysteresis –10 % I + – SENSE SENSE Pins Source Current VSENSE , VSENSE = 1.2V, Current at Each Pin –13 –20 μA DFMAX Maximum Duty Factor PLLFLTR Floats, In Dropout 97 98.5 % TG RUP TG Driver Pull-Up On-Resistance TG High, IOUT = 100mA (Note 7) 2.2 Ω TG RDOWN TG Driver Pull-Down On-Resistance TG Low, IOUT = 100mA (Note 7) 1.8 Ω BG RUP BG Driver Pull-Up On-Resistance BG High, IOUT = 100mA (Note 7) 2.4 Ω BG RDOWN BG Driver Pull-Down On-Resistance BG Low, IOUT = 100mA (Note 7) 0.9 Ω TG/BG t1D Top Gate OFF to Bottom Gate ON Delay All Controllers 50 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate OFF to Top Gate ON Delay All Controllers 50 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time Tested with a Square Wave (Note 8) 130 ns
Tracking
ITRACK TRACK Pin Pull-Up Current VSDB = 5V, VTRACK = 0V –1 μA VFBTRACK VFB Voltage During Tracking VTRACK = 0.2V, VITH = 1.2V (Note 4) 180 200 220 mV VTRACK = 0.4V, VITH = 1.2V (Note 4) 380 400 420 mV 3773fb 3
