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LTC4008EGN Datasheet(PDF) 3 Page - Linear Technology |
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LTC4008EGN Datasheet(HTML) 3 Page - Linear Technology |
3 / 24 page 3 LTC4008 4008fa 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. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Current Sense Amplifier, CA1 Input Bias Current Into BAT Pin 11.66 µA CMSL CA1/I1 Input Common Mode Low ● 0V CMSH CA1/I1 Input Common Mode High VDCIN ≤ 28V ● VCLN – 0.2 V VOS Input Voltage Offset –3.5 3.5 mV Current Comparators ICMP and IREV ITMAX Maximum Current Sense Threshold (VCSP – VBAT)VITH = 2.5V ● 140 165 200 mV ITREV Reverse Current Threshold (VCSP – VBAT)– 30 mV Current Sense Amplifier, CA2 Transconductance 1 mmho Source Current Measured at ITH, VITH = 1.4V – 40 µA Sink Current Measured at ITH, VITH = 1.4V 40 µA Current Limit Amplifier Transconductance 1.4 mmho VCLP Current Limit Threshold ● 93 100 107 mV ICLN CLN Input Bias Current 100 nA Voltage Error Amplifier, EA Transconductance 1 mmho VREF Reference Voltage Used to Calculate VFLOAT 1.19 V IBEA Input Bias Current ±4 ±25 nA Sink Current Measured at ITH, VITH = 1.4V 36 µA OVSD Overvoltage Shutdown Threshold as a Percent ● 102 107 110 % of Programmed Charger Voltage Input P-Channel FET Driver (INFET) (LTC4008 Only) DCIN Detection Threshold (VDCIN – VCLP) DCIN Voltage Ramping Up ● 0 0.17 0.25 V from VCLP – 0.1V Forward Regulation Voltage (VDCIN – VCLP) ● 25 50 mV Reverse Voltage Turn-Off Voltage (VDCIN – VCLP) DCIN Voltage Ramping Down ● –60 –25 mV INFET “On” Clamping Voltage (VCLP – VINFET)IINFET = 1µA ● 5 5.8 6.5 V INFET “Off” Clamping Voltage (VCLP – VINFET)IINFET = – 25µA 0.25 V Thermistor NTCVR Reference Voltage During Sample Time 4.5 V High Threshold VNTC Rising ● NTCVR NTCVR NTCVR V • 0.48 • 0.5 • 0.52 Low Threshold VNTC Falling ● NTCVR NTCVR NTCVR V • 0.115 • 0.125 • 0.135 Thermistor Disable Current VNTC ≤ 10V 10 µA Indicator Outputs (ACP/ SHDN, FLAG, ICL, FAULT C10TOL FLAG (C/10) Accuracy Voltage Falling at PROG ● 0.375 0.397 0.420 V ICL Threshold Accuracy VCLP – VCLN 83 93 105 mV VOL Low Logic Level of ACP/SHDN, FLAG, ICL, FAULT IOL = 100µA 0.5 V VOH High Logic Level of ACP/SHDN, ICL IOH = –1µA ● 2.7 V IOFF Off State Leakage Current of FLAG, FAULT VOH = 3V –1 1 µA IPO Pull-Up Current on ACP/SHDN, ICL V = 0V –10 µA |
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