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LTC4099 Datasheet(PDF) 4 Page - Linear Technology |
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LTC4099 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 36 page  LTC4099 4 4099f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VTRKL Trickle Charge Threshold Voltage BAT Rising 2.7 2.85 3 V ΔVTRKL Trickle Charge Hysteresis Voltage 130 mV VRECHRG Recharge Battery Threshold Voltage Threshold Voltage Relative to VFLOAT –75 –100 –125 mV tTERM_RANGE Safety Timer Termination Period Range Selectable by I2C, Timer Starts When BAT = VFLOAT 1-8 Hour tBADBAT Bad Battery Termination Time BAT < VTRKL 0.4 0.5 0.6 Hour VC/x Full Capacity Charge Indication PROG Voltage (Note 5) COVERX1/0 = 00 90 100 110 mV COVERX1/0 = 01 40 50 60 mV COVERX1/0 = 10 190 200 210 mV COVERX1/0 = 11 490 500 510 mV RON_CHG Battery Charger Power FET On-Resistance (Between VOUT and BAT) IBAT = 200mA 0.18 Ω TLIM Junction Temperature in Constant- Temperature Mode Selectable by I2C 85, 105 °C Bat-Track External Switching Regulator Control VWALL Absolute WALL Input Threshold Rising Threshold Falling Threshold 4.15 4.3 3.2 4.45 V V ΔVWALL Differential WALL Input Threshold WALL–BAT Rising Threshold WALL–BAT Falling Threshold 0 90 37 50 mV mV VOUT Regulation Target Under VC Control 3.5 BAT + 0.3 V IWALLQ WALL Quiescent Current 130 μA RACPR ACPR Pull-Down Strength 150 Ω VHACPR ACPR High Voltage IACPR = 0mA VOUT V VLACPR ACPR Low Voltage IACPR = 0mA 0 V Overvoltage Protection VOVCUTOFF Overvoltage Protection Threshold Rising Threshold, ROVSENS = 6.2k 6.10 6.35 6.70 V VOVGATE OVGATE Output Voltage Input Below VOVCUTOFF Input Above VOVCUTOFF 1.88 • VOVSENS 0 12 V V IOVSENSQ OVSENS Quiescent Current VOVSENS = 5V 40 μA tRISE OVGATE Time to Reach Regulation COVGATE = 1nF 2.5 ms Overtemperature Battery Conditioner IDISCHARGE Overtemperature Battery Discharge Current Only When Enabled via I2C Control 180 mA VALLOW Maximum Allowed Overtemperature Battery Voltage Only When Enabled via I2C Control 3.85 V NTC VTOO_COLD Cold Temperature Fault Threshold Voltage Rising Threshold Hysteresis 72.3 73.8 3.6 75.3 %NTCBIAS %NTCBIAS VTOO_WARM Hot Temperature Fault Threshold Voltage Falling Threshold Hysteresis 31.3 32.6 3.3 33.9 %NTCBIAS %NTCBIAS VOVERTEMP Critically High Temperature Fault Threshold Voltage Falling Threshold Hysteresis 21.9 22.8 50 23.7 %NTCBIAS mV INTC NTC Leakage Current NTC = NTCBIAS –50 50 nA ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temp- erature range, otherwise specifications are at TA = 25°C. VBUS = 5V, BAT = 3.8V, DVCC = 3.3V, RPROG = 1.02k, RCLPROG = 3.01k, unless otherwise noted. |
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