Datasheet LTC3812-5 (Analog Devices) - 3

LTC3812-5
The ELECTRICAL CHARACTERISTICS
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C (Note 2), INTVCC = VBOOST = VRNG = VEXTVCC = VNDRV = 5V, VFCB = VSW = 0V, unless otherwise specifi ed. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
INTVCC INTVCC Supply Voltage l 4.35 14 V IQ INTVCC Supply Current RUN/SS > 1.5V (Notes 4, 5) 3 6 mA INTVCC Shutdown Current RUN/SS = 0V 224 600 μA IBOOST BOOST Supply Current RUN/SS > 1.5V (Note 5) 240 400 μA RUN/SS = 0V 0 5 μA VFB Feedback Voltage (Note 4) 0.796 0.800 0.804 V 0°C to 85°C l 0.794 0.800 0.806 V –40°C to 85°C l 0.792 0.800 0.806 V –40°C to 125°C l 0.792 0.800 0.808 V ∆V Feedback Voltage Line Regulation 5V < INTV FB,LINE CC < 14V (Note 4) l 0.002 0.02 %/V VSENSE(MAX) Maximum Current Sense Threshold VRNG = 2V, VFB = 0.76V 256 320 384 mV VRNG = 0V, VFB = 0.76V 70 95 120 mV VRNG = INTVCC, VFB = 0.76V 170 215 260 mV VSENSE(MIN) Minimum Current Sense Threshold VRNG = 2V, VFB = 0.84V –300 mV VRNG = 0V, VFB = 0.84V –85 mV VRNG = INTVCC, VFB = 0.84V –200 mV IVFB Feedback Current VFB = 0.8V 20 150 nA AVOL(EA) Error Amplifi er DC Open-Loop Gain 65 100 dB fU Error Amp Unity Gain Crossover (Note 6) 25 MHz Frequency VFCB FCB Threshold VFCB Rising 0.75 0.8 0.85 V IFCB FCB Current FCB = 5V 0 1 μA VRUN/SS Shutdown Threshold 1.2 1.5 2 V IRUN/SS RUN/SS Source Current RUN/SS = 0V 0.7 1.4 2.5 μA VVCCUV INTVCC Undervoltage Lockout Linear Regulator Mode INTVCC Rising, INDRV = 100μA l 4.05 4.2 4.35 V External Supply Mode INTVCC Rising, NDRV = INTVCC = EXTVCC l 4.05 4.2 4.35 V Trickle-Charge Mode INTVCC Rising, NDRV = INTVCC, EXTVCC = 0 l 8.70 9.0 9.30 V INTVCC Falling 3.7 V
Oscillator
tON On-Time ION = 100μA 1.55 1.85 2.15 μs ION = 300μA 515 605 695 ns tON(MIN) Minimum On-Time ION = 2500μA 100 ns tOFF(MIN) Minimum Off-Time 250 350 ns
Driver
IBG,PEAK BG Driver Peak Source Current VBG = 0V 0.7 1 A RBG,SINK BG Driver Pull-Down RDS(ON) 1 1.5 Ω ITG,PEAK TG Driver Peak Source Current VTG – VSW = 0V 0.7 1 A RTG,SINK TG Driver Pull-Down RDS(ON) 1 1.5 Ω
PGOOD Output
∆V PGOOD Upper Threshold V 7.5 10 12.5 % FBOV FB Rising PGOOD Lower Threshold VFB Falling –7.5 –10 –12.5 % ∆V PGOOD Hysterisis V FB,HYST FB Returning 1.5 3 % VPGOOD PGOOD Low Voltage IPGOOD = 5mA 0.3 0.6 V 38125fc 3