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LTC4278 Datasheet(PDF) 5 Page - Linear Technology |
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LTC4278 Datasheet(HTML) 5 Page - Linear Technology |
5 / 32 page LTC4270/LTC4271 5 42701f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 3 & 4) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCUT Overcurrent Sense Voltage VSENSEn – VEE, hpen = 0Fh, cutn = D4h hpen = 0Fh, cutn = E2h (Note 12) l l 89 152 94 159 99 168 mV mV Overcurrent Sense in AUTO Pin Mode Class 0, Class 3 Class 1 Class 2 Class 4 l l l l 89 26 49 152 94 28 52 159 99 30 55 168 mV mV mV mV VLIM Active Current Limit in 802.3af Compliant Mode VSENSEn – VEE, hpen = 0Fh, limn = 80h VEE < VOUT < AGND – 29V AGND – VOUT = 0V (Note 12) l l 102 25 106 112 50 mV mV Active Current Limit in High Power Mode hpen = 0Fh, limn = C0h VOUT – VEE = 0 – 10V VEE + 23V < VOUT < AGND – 29V AGND – VOUT = 0V (Note 12) l l l 204 102 25 212 106 225 115 50 mV mV mV Active Current Limit in AUTO Pin Mode VEE < VOUT < AGND – 10V Class 0 to Class 3 Class 4 l l 102 204 106 212 112 225 mV mV VMIN DC Disconnect Sense Voltage VSENSE – VEE, rdis Bit = 0 VSENSE – VEE, rdis Bit = 1 (Note 12) l l 2.6 1.3 3.8 1.9 4.9 2.45 mV mV VSC Short-Circuit Sense VSENSEn – VEE – VLIM, rdis Bit = 0 rdis bit = 1 (Note 12) l l 125 70 200 100 255 135 mV mV Port Current Readback Resolution No Missing Codes 12 Bits LSB Weight VSENSEn – VEE 30.518 μV/LSB Conversion Period 25.1 ms/ Convert Port Voltage Readback Resolution No Missing Codes 12 Bits LSB Weight VSENSEn – VEE 5.8250 mV/LSB LTC4270 Die Temperature Die Temperature Offset Temperature Register = 00h (Note 7) –40 °C Die Temperature LSB Weight (Note 7) 0.7 °C/LSB Digital Interface VILD Digital Input Low Voltage (Note 6) l 0.8 V VIHD Digital Input High Voltage (Note 6) l 2.2 V Digital Output Voltage Low ISDAOUT = 3mA, IINT = 3mA ISDAOUT = 5mA, IINT = 5mA l l 0.4 0.7 V V Internal Pull Up to VDD ADn, RESET, MSD, INT, GPn l 50 kΩ Internal Pull Down To DGND AUTO, MID l 50 kΩ |
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