Datasheet LTC3619B (Analog Devices) - 3

LTC3619B
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IFB Feedback Pin Input Current l ±30 nA VFBREG Feedback Voltage (Channels 1, 2) LTC3619BE, –40°C < TJ < 85°C (Note 7) l 0.588 0.600 0.612 V LTC3619BI, –40°C < TJ < 125°C (Note 7) 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 Shutdown VRUN1 = VRUN2 = 0V, VIN = 5.5V 1 µA fOSC Oscillator Frequency VFB = VFBREG 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) 1800 2400 mA IINLIM Input Average Current Limit RLIM = 116k 450 475 500 mA RLIM = 116k, LTC3619BE l 437 475 513 mA RLIM = 116k, LTC3619BI 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 0V ≤ VRUN ≤ 5V 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 4:
Dynamic supply current is higher due to the internal gate charge may cause permanent damage to the device. Exposure to any Absolute being delivered at the switching frequency. Maximum Rating condition for extended periods may affect device
Note 5:
The switch on-resistance is guaranteed by correlation to wafer reliability and lifetime. level measurements.
Note 2:
Guaranteed by long term current density limitations.
Note 6:
This IC includes overtemperature protection that is intended
Note 3:
The LTC3619B is tested under pulsed load conditions such that to protect the device during momentary overload conditions. Junction TJ ≈ TA. The LTC3619BE is guaranteed to meet performance specifications temperature will exceed 125°C when overtemperature protection is active. from 0°C to 85°C. Specifications over the –40°C to 125°C operating Continuous operation above the specified maximum operating junction junction temperature range are assured by design, characterization and temperature may impair device reliability. correlation with statistical process controls. The LTC3619BI is guaranteed
Note 7:
The converter is tested in a proprietary test mode that connects to meet specified performance over the full –40°C to 125°C operating the output of the error amplifier to the SW pin, which is connected to an junction temperature range. Note that the maximum ambient temperature external servo loop. is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental
Note 8:
TJ is calculated from the ambient temperature TA and the power factors. dissipation as follows: TJ = TA + (PD)(θJA°C/W) 3619bfb 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts