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LTC4081 Datasheet(PDF) 3 Page - Linear Technology |
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LTC4081 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LTC4081 3 4081f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IBAT_SD Battery Current in Shutdown (Both Battery Charger and Switching Regulator Off) V⎯E⎯⎯N⎯_⎯C⎯H⎯R⎯G = 5V, VEN_BUCK = 0, VCC > VBAT V⎯E⎯⎯N⎯_⎯C⎯H⎯R⎯G = 4V, VEN_BUCK = 0, VCC (3.5V) < VBAT (4V) ● 0.6 2 5μA μA Battery Charger VFLOAT VBAT Regulated Output Voltage IBAT = 2mA IBAT = 2mA, 4.3V < VCC < 5.5V ● 4.179 4.158 4.2 4.2 4.221 4.242 V V IBAT Current Mode Charge Current RPROG = 4k; Current Mode; VEN_BUCK = 0 RPROG = 0.8k; Current Mode; VEN_BUCK = 0 ● ● 90 475 100 500 110 525 mA mA VUVLO_CHRG VCC Undervoltage Lockout Voltage VCC Rising VCC Falling ● ● 3.5 2.8 3.6 3.0 3.7 3.2 V V VPROG PROG Pin Servo Voltage 0.8k ≤ RPROG ≤ 4k ● 0.98 1.0 1.02 V VASD Automatic Shutdown Threshold Voltage (VCC – VBAT), VCC Low to High (VCC – VBAT), VCC High to Low 60 15 82 32 100 45 mV mV tSS_CHRG Battery Charger Soft-Start Time 180 μs ITRKL Trickle Charge Current VBAT = 2V, RPROG = 0.8k 35 50 65 mA VTRKL Trickle Charge Threshold Voltage VBAT Rising ● 2.75 2.9 3.05 V VTRHYS Trickle Charge Threshold Voltage Hysteresis 100 150 350 mV ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT – VBAT, 0°C < TA < 85°C 70 100 130 mV ΔVUVCL1, ΔVUVCL2 (VCC – VBAT) Undervoltage Current Limit Threshold Voltage IBAT = 0.9 ICHG IBAT = 0.1 ICHG 180 90 300 130 mV mV tTIMER Charge Termination Timer ● 3 4.5 6 hrs Recharge Time ● 1.5 2.25 3 hrs Low-Battery Charge Time VBAT = 2.5V ● 0.75 1.125 1.5 hrs IC/10 End of Charge Indication Current Level RPROG = 2k (Note 6) ● 0.085 0.1 0.115 mA/mA TLIM Junction Temperature in Constant- Temperature Mode 115 °C RON_CHRG Power FET On-Resistance (Between VCC and BAT) IBAT = 350mA, VCC = 4V 700 mΩ fBADBAT Defective Battery Detection ⎯C⎯H⎯R⎯G Pulse Frequency VBAT = 2V 2 Hz DBADBAT Defective Battery Detection ⎯C⎯H⎯R⎯G Pulse Frequency Duty Ratio VBAT = 2V 75 % INTC NTC Pin Current VNTC = 2.5V 1 μA VCOLD Cold Temperature Fault Threshold Voltage Rising Voltage Threshold Hysteresis 0.76 • VCC 0.015 • VCC V V VHOT Hot Temperature Fault Threshold Voltage Falling Voltage Threshold Hysteresis 0.35 • VCC 0.017 • VCC V V VDIS NTC Disable Threshold Voltage Falling Threshold; VCC = 5V Hysteresis 82 50 mV mV fNTC Fault Temperature ⎯C⎯H⎯R⎯G Pulse Frequency 2Hz DNTC Fault Temperature ⎯C⎯H⎯R⎯G Pulse Frequency Duty Ratio 25 % The ● denotes specifications which apply over the full operating tempera- ture range, otherwise specifications are at TA = 25°C, VCC = 5V, VBAT = 3.8V, V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 0V, VNTC = 0V, VEN_BUCK = VBAT, VMODE = 0V. (Note 2) ELECTRICAL CHARACTERISTICS |
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