Datasheet LT3980 (Analog Devices) - 3

LT3980
elecTrical characTerisTics The
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBOOST = 15V, VBD = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Quiescent Current from BD VRUN/SS = 0.2V 0.01 0.5 µA VBD = 3V, Not Switching 55 82 115 µA VBD = 0, Not Switching 1 5 µA Feedback Voltage 782 790 798 mV ● 770 790 805 mV FB Pin Bias Current (Note 3) VFB = 0.8V, VC = 1.2V ● 10 40 nA FB Voltage Line Regulation 4V < VIN < 56V 0.002 0.01 %/V Error Amp gm 500 µmho Error Amp Gain 1800 VC Source Current 60 µA VC Sink Current 60 µA VC Pin to Switch Current Gain 3.87 A/V VC Clamp Voltage 2 V Switching Frequency RT = 8.66k 1.95 2.25 2.55 MHz RT = 29.4k 0.86 1.07 1.27 MHz RT = 187k 195 225 255 kHz Minimum Switch Off-Time ● 140 230 nS Switch Current Limit Duty Cycle = 5% 3.3 4 4.9 A Switch VCESAT ISW = 2A 540 mV DA Pin Current to Pause OSC 1.9 2.4 3 A Boost Schottky Reverse Leakage VBD = 0V 0.02 2 µA Minimum Boost Voltage (Note 4) ● 1.7 2.2 V BOOST Pin Current ISW = 2A 40 55 mA RUN/SS Pin Current VRUN/SS = 2.5V 6 10 µA RUN/SS Input Voltage High 2.5 V RUN/SS Input Voltage Low ● 0.4 V PG Threshold Offset from Feedback Voltage VFB Rising ● 50 65 80 mV PG Hysteresis 14 mV PG Leakage VPG = 5V 0.1 1 µA PG Sink Current VPG = 0.4V ● 200 700 µA SYNC Threshold 0.575 0.675 0.775 V SYNC Pin Bias Current VSYNC = 0V 0.1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings specifications are guaranteed over the –40°C to 150°C operating may cause permanent damage to the device. Exposure to any Absolute temperature range. High junction temperatures degrade operating Maximum Rating condition for extended periods may affect device lifetimes. Operating lifetime is derated at junction temperatures greater reliability and lifetime. than 125°C.
Note 2:
The LT3980E is guaranteed to meet performance specifications
Note 3:
Bias current flows out of the FB pin. from 0°C to 125°C. Specifications over the –40°C to 125°C operating
Note 4:
This is the minimum voltage across the boost capacitor needed to temperature range are assured by design, characterization and correlation guarantee full saturation of the switch. with statistical process controls. The LT3980I specifications are
Note 5:
Absolute Maximum at V guaranteed over the –40°C to 125°C temperature range. The LT3980H IN and RUN/SS pins is 80V for non- repetitive 1 minute transients, and 60V for continuous operation. 3980fa For more information www.linear.com/LT3980 3 Document Outline Features Description Applications 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 Revision History Typical Application Related Parts