Datasheet LTC3637 (Analog Devices) - 3

LTC3637
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply (VIN)
VIN Input Voltage Operating Range 4 76 V VOUT Output Voltage Operating Range 0.8 VIN V UVLO VIN Undervoltage Lockout VIN Rising l 3.45 3.65 3.85 V VIN Falling l 3.30 3.5 3.70 V Hysteresis 150 mV IQ DC Supply Current (Note 5) Active Mode 165 350 µA Sleep Mode No Load 12 20 µA Shutdown Mode RUN = 0V 3 10 µA RUN and OVLO Pin Threshold Voltage Rising 1.17 1.21 1.25 V Falling 1.06 1.10 1.14 V Hysteresis 110 mV RUN Pin Leakage Current RUN = 1.3V –10 0 10 nA
Output Supply (VFB)
Feedback Comparator Threshold Voltage VFB Rising, VPRG1 = VPRG2 = 0V (Adjustable Output) LTC3637E, LTC3637I l 0.792 0.800 0.808 V LTC3637H, LTC3637MP l 0.788 0.800 0.812 V Feedback Comparator Hysteresis VFB Falling, VPRG1 = VPRG2 = 0V l 2.5 5 7 mV (Adjustable Output) Feedback Pin Current VFB = 1V, VPRG1 = 0V, VPRG2 = 0V –10 0 10 nA Feedback Comparator Threshold Voltages VFB Rising, VPRG1 = SS, VPRG2 = 0V l 4.940 5.015 5.090 V (Fixed Output) VFB Falling, VPRG1 = SS, VPRG2 = 0V l 4.910 4.985 5.060 V VFB Rising, VPRG1 = 0V, VPRG2 = SS l 3.250 3.310 3.370 V VFB Falling, VPRG1 = 0V, VPRG2 = SS l 3.230 3.290 3.350 V VFB Rising, VPRG1 = VPRG2 = SS l 1.775 1.805 1.835 V VFB Falling, VPRG1 = VPRG2 = SS l 1.765 1.795 1.825 V Feedback Voltage Line Regulation VIN = 4V to 76V 0.001 %/V
Operation
Peak Current Comparator Threshold ISET Floating l 2 2.4 2.8 A 100k Resistor from ISET to GND l 0.9 1.2 1.5 A ISET Shorted to GND l 0.17 0.24 0.31 A Power Switch On-Resistance ISW = –200mA 0.35 Ω Switch Pin Leakage Current VIN = 65V, SW = 0V 0.1 1 μA Soft-Start Pin Pull-Up Current SS Pin < 2.5V 3 5 6 μA Internal Soft-Start Time SS Pin Floating 0.8 ms
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings High junction temperatures degrade operating lifetimes; operating lifetime may cause permanent damage to the device. Exposure to any Absolute is derated for junction temperatures greater than 125°C. Note that the Maximum Rating condition for extended periods may affect device maximum ambient temperature consistent with these specifications is reliability and lifetime. determined by specific operating conditions in conjunction with board
Note 2:
The LTC3637 is tested under pulsed load conditions such that layout, the rated package thermal impedance and other environmental T factors. J ≈ TA. The LTC3637E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 125°C operating
Note 3:
The junction temperature (TJ, in °C) is calculated from the ambient junction temperature range are assured by design, characterization and temperature (TA, in °C) and power dissipation (PD, in Watts) according to correlation with statistical process controls. The LTC3637I is guaranteed the formula: over the –40°C to 125°C operating junction temperature range, the TJ = TA + (PD • θJA) LTC3637H is guaranteed over the –40°C to 150°C operating junction where θ temperature range and the LTC3637MP is tested and guaranteed over the JA is 43°C/W for the DFN or 45°C/W for the MSOP. –55°C to 150°C operating junction temperature range. 3637fa For more information www.linear.com/LTC3637 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts