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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4008 датащи(PDF) 4 Page - Linear Technology |
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LTC4008 датащи(HTML) 4 Page - Linear Technology |
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4 / 24 page  4 LTC4008 4008fa TYPICAL PERFOR A CE CHARACTERISTICS INFET Response Time to Reverse Current VFB vs DCIN BATMON Offset TEST PERFORMED ON DEMOBOARD VIN = 15VDC CHARGER = ON ICHARGE = <10mA Vs OF PFET (5V/DIV) Id (REVERSE) OF PFET (5A/DIV) Vgs OF PFET (2V/DIV) 4008 G01 VCHARGE = 12.6V INFET = 1/2 Si4925DY Vgs = 0 Vs = 0V Id = 0A 1.25 µs/DIV DCIN (V) 6 11162126 4008 G02 0.05 0 –0.05 –0.10 –0.15 –0.20 BATTERY VOLTAGE (V) 3 8 13 18 23 4008 G03 0.02 0 –0.02 –0.04 –0.06 –0.08 –0.10 DCIN = 15V DCIN = 20V DCIN = 24V BATMON LOAD = 100k Ω The ● denotes specifications which apply over the full operating temperature range (Note 4), otherwise specifications are at TA = 25°C. VDCIN = 20V, VBAT = 12V unless otherwise noted. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: See Test Circuit. Note 3: Does not include tolerance of current sense resistor or current programming resistor. Note 4: The LTC4008E is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 5: Voltage accuracy includes BATMON error and voltage reference error. Does not include error of external resistor divider. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Oscillator fOSC Regulator Switching Frequency 255 300 345 kHz fMIN Regulator Switching Frequency in Drop Out Duty Cycle ≥ 98% 20 25 kHz DCMAX Regulator Maximum Duty Cycle VCSP = VBAT 98 99 % Gate Drivers (TGATE, BGATE) VTGATE High (VCLP – VTGATE)ITGATE = –1mA 50 mV VBGATE High CLOAD = 3000pF 5.6 10 V VTGATE Low (VCLP – VTGATE)CLOAD = 3000pF 5.6 10 V VBGATE Low IBGATE = 1mA 50 mV TGATE Transition Time TGTR TGATE Rise Time CLOAD = 3000pF, 10% to 90% 50 110 ns TGTF TGATE Fall Time CLOAD = 3000pF, 10% to 90% 50 100 ns BGATE Transition Time BGTR BGATE Rise Time CLOAD = 3000pF, 10% to 90% 40 90 ns BGTF BGATE Fall Time CLOAD = 3000pF, 10% to 90% 40 80 ns VTGATE at Shutdown (VCLP – VTGATE)ITGATE = –1µA, DCIN = 0V, CLP = 12V 100 mV VBGATE at Shutdown IBGATE = 1µA, DCIN = 0V, CLP = 12V 100 mV (TA = 25°C unless otherwise noted) |
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