Datasheet LTC3619 (Analog Devices) - 3

LTC3619
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C, VIN = 5V, unless otherwise noted. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IFB Feedback Pin Input Current l ±30 nA VFBREG Feedback Voltage (Channels 1, 2) LTC3619E, –40°C ≤ TJ ≤ 85°C l 0.588 0.600 0.612 V LTC3619I, –40°C ≤ TJ ≤ 125°C l 0.582 0.600 0.618 V ΔVLINEREG VFB Line Regulation VIN = 2.5V to 5.5V (Note 7) 0.01 0.25 %/V ΔVLOADREG VFB Load Regulation (Channel 1) ILOAD = 0mA to 400mA (Note 7) 0.5 % VFB Load Regulation (Channel 2) ILOAD = 0mA to 800mA (Note 7) 0.5 % IS Supply Current Active Mode (Note 4) VFB1 = VFB2 = 0.95 × VFBREG 600 875 µA Sleep Mode VFB = 1.05 × VFBREG, VIN = 5.5V 50 100 µA Shutdown VRUN1 = VRUN2 = 0V, VIN = 5.5V 1 µA fOSC Oscillator Frequency VFB = 0.6V l 1.8 2.25 2.7 MHz ILIM(PEAK) Peak Switch Current Limit VIN = 5V, VFB < VFBREG, Duty Cycle <35% Channel 1 (400mA) 550 800 mA Channel 2 (800mA) 1200 1600 mA IINLIM (PEAK) Input Average Current Limit RLIM = 116k 450 475 500 mA RLIM = 116k, LTC3619E l 437 475 513 mA RLIM = 116k, LTC3619I l 427 475 523 mA RDS(ON) Channel 1 (Note 5) Top Switch On-Resistance VIN = 5V, ISW = 100mA 0.45 Ω Bottom Switch On-Resistance VIN = 5V, ISW = 100mA 0.35 Ω Channel 2 (Note 5) Top Switch On-Resistance VIN = 5V, ISW = 100mA 0.27 Ω Bottom Switch On-Resistance VIN = 5V, ISW = 100mA 0.25 Ω ISW(LKG) Switch Leakage Current VIN = 5V, VRUN = 0V 0.01 1 µA tSOFTSTART Soft-Start Time VFB from 0.06V to 0.54V 0.3 0.95 1.3 ms VRUN RUN Threshold High l 0.4 1 1.2 V IRUN RUN Leakage Current l 0.01 1 µA PGOOD Power Good Threshold Entering Window VFB Ramping Up –5 –7 % VFB Ramping Down 5 7 % Leaving Window VFB Ramping Up 9 11 % VFB Ramping Down –9 –11 % PGOOD Blanking Power Good Blanking Time PGOOD Rising and Falling, VIN = 5V 90 µs RPGOOD Power Good Pull-Down On-Resistance 8 15 30 Ω IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
The switch on-resistance is guaranteed by correlation to wafer may cause permanent damage to the device. Exposure to any Absolute level measurements. Maximum Rating condition for extended periods may affect device
Note 6:
This IC includes overtemperature protection that is intended reliability and lifetime. to protect the device during momentary overload conditions. Junction
Note 2:
Guaranteed by long term current density limitations. temperature will exceed 125°C when overtemperature protection is active.
Note 3:
The LTC3619 is tested under pulsed load conditions such that Continuous operation above the specified maximum operating junction TJ ≈ TA. The LTC3619E is guaranteed to meet performance specifications temperature may impair device reliability. from 0°C to 85°C. Specifications over the –40°C to 85°C operating
Note 7:
The converter is tested in a proprietary test mode that connects junction temperature range are assured by design, characterization and the output of the error amplifier to the SW pin, which is connected to an correlation with statistical process controls. The LTC3619I is guaranteed external servo loop. to meet specified performance over the full –40°C to 125°C operating
Note 8:
T junction temperature range. J is calculated from the ambient temperature TA and the power dissipation as follows: T
Note 4:
Dynamic supply current is higher due to the internal gate charge J = TA + (PD)(θJA°C/W). being delivered at the switching frequency. 3619fa 3 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Functional Diagram Operation Applications Information Package Description Typical Application Related Parts