Datasheet LTC3828 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Dual, 2-Phase Step-Down Controller with Tracking |
| Pages / Page | 32 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 388 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC3828
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, VRUN1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VOSENSE1, 2 Regulated Feedback Voltage (Note 3); ITH1, 2 Voltage = 1.2V l 0.792 0.800 0.808 V IVOSENSE1, 2 Feedback Current (Note 3) ±5 ±50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.6V to 28V (Note 3) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; ΔITH Voltage = 1.2V to 0.7V l 0.1 0.5 % Measured in Servo Loop; ΔITH Voltage = 1.2V to 2.0V l –0.1 –0.5 % gm1, 2 Transconductance Amplifi er gm ITH1, 2 = 1.2V; Sink/Source 5μA; (Note 3) 1.3 mmho gmGBW1, 2 Transconductance Amplifi er GBW ITH1, 2 = 1.2V; (Note 3) 3 MHz IQ Input DC Supply Current (Note 4) Normal Mode VOUT1 = 5V 2 3 mA Shutdown VRUN/SS1, 2 = 0V 20 100 μA VFCB Forced Continuous Threshold l 0.76 0.800 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.85V –0.50 –0.18 –0.1 μA VBINHIBIT Burst Inhibit (Constant Frequency) Measured at FCB pin 4.3 4.8 V Threshold UVLO Undervoltage Lockout VIN Ramping Down l 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VOSENSE1, 2 l 0.84 0.86 0.88 V I – – + + SENSE Sense Pins Total Source Current (Each Channel); VSENSE1 , 2 = VSENSE1 , 2 = 0V –90 –65 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRCKSS1,2 Soft-Start Charge Current VTRCKSS1, 2 = 0.2V 0.5 1.2 μA VRUN1, 2 ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 1.0 1.5 2.0 V V – – SENSE(MAX) Maximum Current Sense Threshold VOSENSE1, 2 = 0.7V,VSENSE1 , 2 = 5V 62 75 85 mV V – – OSENSE1, 2 = 0.7V,VSENSE1 , 2 = 5V l 60 75 88 mV TG Transition Time: (Note 5) TG1, 2 tr Rise Time CLOAD = 3300pF 55 100 ns TG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns BG Transition Time: (Note 5) BG1, 2 tr Rise Time CLOAD = 3300pF 65 120 ns BG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver 60 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver 80 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time Tested with a Square Wave (Note 6) 120 ns
INTVCC Linear Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.2 2.0 %
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLFLTR = 1.2V 360 400 440 kHz fLOW Lowest Frequency VPLLFLTR = 0V 230 260 290 kHz fHIGH Highest Frequency VPLLFLTR ≥ 2.4V 480 550 590 kHz IPLLFLTR Phase Detector Output Current VPLLFLTR = 1.2V Sinking Capability fPLLIN < fNOM –17 μA Sourcing Capability fPLLIN > fNOM 17 μA 3828fc 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, VRUN1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VOSENSE1, 2 Regulated Feedback Voltage (Note 3); ITH1, 2 Voltage = 1.2V l 0.792 0.800 0.808 V IVOSENSE1, 2 Feedback Current (Note 3) ±5 ±50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.6V to 28V (Note 3) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 3) Measured in Servo Loop; ΔITH Voltage = 1.2V to 0.7V l 0.1 0.5 % Measured in Servo Loop; ΔITH Voltage = 1.2V to 2.0V l –0.1 –0.5 % gm1, 2 Transconductance Amplifi er gm ITH1, 2 = 1.2V; Sink/Source 5μA; (Note 3) 1.3 mmho gmGBW1, 2 Transconductance Amplifi er GBW ITH1, 2 = 1.2V; (Note 3) 3 MHz IQ Input DC Supply Current (Note 4) Normal Mode VOUT1 = 5V 2 3 mA Shutdown VRUN/SS1, 2 = 0V 20 100 μA VFCB Forced Continuous Threshold l 0.76 0.800 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.85V –0.50 –0.18 –0.1 μA VBINHIBIT Burst Inhibit (Constant Frequency) Measured at FCB pin 4.3 4.8 V Threshold UVLO Undervoltage Lockout VIN Ramping Down l 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VOSENSE1, 2 l 0.84 0.86 0.88 V I – – + + SENSE Sense Pins Total Source Current (Each Channel); VSENSE1 , 2 = VSENSE1 , 2 = 0V –90 –65 μA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRCKSS1,2 Soft-Start Charge Current VTRCKSS1, 2 = 0.2V 0.5 1.2 μA VRUN1, 2 ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 1.0 1.5 2.0 V V – – SENSE(MAX) Maximum Current Sense Threshold VOSENSE1, 2 = 0.7V,VSENSE1 , 2 = 5V 62 75 85 mV V – – OSENSE1, 2 = 0.7V,VSENSE1 , 2 = 5V l 60 75 88 mV TG Transition Time: (Note 5) TG1, 2 tr Rise Time CLOAD = 3300pF 55 100 ns TG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns BG Transition Time: (Note 5) BG1, 2 tr Rise Time CLOAD = 3300pF 65 120 ns BG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver 60 ns Synchronous Switch-On Delay Time BG/TG t2D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver 80 ns Top Switch-On Delay Time tON(MIN) Minimum On-Time Tested with a Square Wave (Note 6) 120 ns
INTVCC Linear Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.2 2.0 %
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLFLTR = 1.2V 360 400 440 kHz fLOW Lowest Frequency VPLLFLTR = 0V 230 260 290 kHz fHIGH Highest Frequency VPLLFLTR ≥ 2.4V 480 550 590 kHz IPLLFLTR Phase Detector Output Current VPLLFLTR = 1.2V Sinking Capability fPLLIN < fNOM –17 μA Sourcing Capability fPLLIN > fNOM 17 μA 3828fc 3
