Datasheet LTC3828 (Analog Devices) - 3

FabricanteAnalog Devices
DescripciónDual, 2-Phase Step-Down Controller with Tracking
Páginas / Página32 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply …
Formato / tamaño de archivoPDF / 388 Kb
Idioma del documentoInglés

ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating

ELECTRICAL CHARACTERISTICS The denotes the specifi cations which apply over the full operating

Línea de modelo para esta hoja de datos

Versión de texto del documento

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