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LTC4276 Datasheet(PDF) 3 Page - Linear Technology |
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LTC4276 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 26 page  LT4276 3 4276fa For more information www.linear.com/LT4276 elecTrical characTerisTics SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VPORT, HSSRC, VIN Operating Voltage At VPORT Pin l 60 V VSIG VPORT Signature Range At VPORT Pin l 1.5 10 V VCLASS VPORT Classification Range At VPORT Pin l 12.5 21 V VMARK VPORT Mark Range At VPORT Pin, After 1st Classification Event l 5.6 10 V VPORT AUX Range At VPORT Pin, VAUX ≥ 6.45V l 8 60 V Signature/Class Hysteresis Window l 1.0 V Reset Threshold l 2.6 5.6 V VHSON Hot Swap Turn-On Voltage l 35 37 V VHSOFF Hot Swap Turn-Off Voltage l 30 31 V Hot Swap On/Off Hysteresis Window l 3 V Supply Current VPORT, HSSRC & VIN Supply Current VVPORT = VHSSRC = VVIN = 60V l 2 mA VPORT Supply Current During Classification VVPORT = 17.5V, RCLASS, RCLASS++ Open l 0.7 1.0 1.3 mA VPORT Supply Current During Mark Event VVPORT = VMARK after 1st Classification Event l 0.4 2.2 mA Signature and Classification Signature Resistance VSIG (Note 4) l 23.6 24.4 25.5 kΩ Signature Resistance During Mark Event VMARK (Note 4) l 5.2 8.3 11.4 kΩ RCLASS/RCLASS++ Voltage –10mA ≥ IRCLASS ≥ –36mA l 1.36 1.40 1.43 V Classification Stability Time VVPORT Step to 17.5V, RCLS = 35.7Ω l 2 ms Digital Interface VAUXT AUX Threshold VPORT = 17.5V, VIN = VHSSRC = 18.5V l 6.05 6.25 6.45 V IAUXH AUX Pin Current VAUX = 6.05V, VPORT = 17.5V, VIN = 9V, VCC = 0V l 3.3 5.3 7.3 µA T2P Output High VVCC - VT2P, –1mA Load l 0.3 V T2P Leakage VT2P = 0V l –1 1 µA Hot Swap Control IGPU HSGATE Pull Up Current VHSGATE - VHSSRC = 5V (Note 5) l –27 –22 –18 µA HSGATE Voltage –10µA Load, with respect to HSSRC l 10 14 V HSGATE Pull Down Current VHSGATE - VHSSRC = 5V l 400 µA VCC Supply VCCREG VCC Regulation Voltage l 7.2 7.6 8.0 V Feedback Amplifier VFB FB31 Regulation Voltage l 3.11 3.17 3.23 V FB31 Pin Bias Current RLDCMP Open -0.1 µA gm Feedback Amplifier Average Trans- Conductance Time Average, –2µA < IITHB < 2µA l –52 –40 –26 µA/V ISINK ITHB Average Sink Current Time Average, VFB31 = 0V l 4.4 8.0 13.4 µA Soft-Start ISFST Charging Current VSFST = 0.5V, 3.0V l –49 –42 –36 µA The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VVPORT = VHSSRC = VVIN = 40V, VVCC = VCCREG, ROSC, PG, and SG Open, RFFSDLY = 5.23kΩ to GND. AUX connected to GND unless otherwise specified. (Note 2) |
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