Datasheet LTC3783 (Analog Devices) - 4

LTC3783
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 12V, VRUN = 1.5V, VSYNC = 0V, VFBP = VREF, RT = 20k, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RSYNC SYNC Input Pull-Down Resistance 100 kΩ tON(MIN) Minimum On-Time With Sense Resistor, 10mV Overdrive 170 ns No RSENSE Mode 300 ns
Low Dropout Regulator
VINTVCC INTVCC Regulator Output Voltage VOV/FB = 1.5V l 6.5 7 7.5 V UVLO INTVCC Undervoltage Lockout Rising INTVCC 2.3 2.5 V Thresholds Falling INTVCC 1.8 2.1 V Hysteresis 0.2 V ∆VINTVCC INTVCC Line Regulation 12V ≤ VIN ≤ 36V 2 6 mV/V ∆VIN ∆VLDO(LOAD) INTVCC Load Regulation 0 ≤ IINTVCC ≤ 10mA –1 –0.1 % VDROPOUT INTVCC Dropout Voltage VIN = 7V, IINTVCC = 10mA 300 500 mV IINTVCC(SD) Bootstrap Mode INTVCC Supply VSENSE = 0V 25 µA Current in Shutdown VSENSE = 7V 15 µA
GATE/PWMOUT Drivers
tr(GATE) GATE Driver Output Rise Time CL = 3300pF (Note 7) 15 ns tf(GATE) GATE Driver Output Fall Time CL = 3300pF (Note 7) 8 ns IPK(GATE,RISE) GATE Driver Peak Current Sourcing VGATE = 0V 0.5 A IPK(GATE,FALL) GATE Driver Peak Current Sinking VGATE = 7V 1 A VPWMIN PWMIN Pin Input Threshold Voltages Rising PWMIN 1.6 V Falling PWMIN 0.8 V Hysteresis 0.8 V RPWMIN PWMIN Input Pull-Up Resistance 100 kΩ tr(PWMOUT) PWMOUT Driver Output Rise Time CL = 3300pF (Note 7) 30 ns tf(PWMOUT) PWMOUT Driver Output Fall Time CL = 3300pF (Note 7) 16 ns IPK(PWMOUT,RISE) PWMOUT Driver Peak Current Sourcing VPWMOUT = 0V 0.25 A IPK(PWMOUT,FALL) PWMOUT Driver Peak Current Sinking VPWMOUT = 7V 0.50 A
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The dynamic input supply current is higher due to power MOSFET may cause permanent damage to the device. Exposure to any Absolute gate charging (QG • fOSC). See Operation section. Maximum Rating condition for extended periods may affect device
Note 5:
The LTC3783 is tested in a feedback loop which servos VFBN to reliability and lifetime. VFBP = VVREF with the ITH pin forced to the midpoint of its voltage range
Note 2:
The LTC3783E is guaranteed to meet performance specifications (0.3V ≤ VITH ≤ 1.2V; midpoint = 0.75V). over the 0°C to 85°C operating temperature range. Specifications over
Note 6:
In a synchronized application, the internal slope compensation is the –40°C to 85°C operating temperature range are assured by design, increased by 25%. Synchronizing to a significantly higher ratio will reduce characterization and correlation with statistical process controls. The the effective amount of slope compensation, which could result in sub- LTC3783I is guaranteed to meet performance specifications over the full harmonic oscillation for duty cycles greater than 50% –40°C to 125°C operating temperature range.
Note 7
: Rise and fall times are measured at 10% and 90% levels.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 43°C/W) for the DFN TJ = TA + (PD • 38°C/W) for the TSSOP 3783fb 4 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Package Description Related Parts