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LTC4001EUF Datasheet(PDF) 3 Page - Linear Technology |
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LTC4001EUF Datasheet(HTML) 3 Page - Linear Technology |
3 / 20 page 3 LTC4001 4001f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tTIMER Timer Accuracy CTIMER = 0.22µF ±10 % VEN Enable Input Threshold Voltage VEN Rising 0.6 0.8 1 V ∆VEN Enable Input Hysteresis 100 mV VPROG PROG Pin Voltage RPROG = 549Ω 1.213 V VIDET IDET Pin Voltage RIDET = 549Ω 1.213 V IIDET IDET Threshold RIDET = 549Ω 150 200 250 mA ICHRG CHRG Pin Weak Pull-Down Current VCHRG = 1V 15 30 50 µA VCHRG CHRG Pin Output Low Voltage ICHRG = 5mA 0.2 0.4 V VOL FAULT Pin Output Low Voltage 1mA Load 0.4 V VOH FAULT Pin Output High Voltage 1mA Load 4.6 V VRECHRG Recharge Battery Threshold Voltage VFLOAT – VRECHRG VBAT Falling 50 100 135 mV tRB Recharge Filter Time Constant 4 ms tRECHRG Recharge Time Percent of Total Charge Time 50 % tTRIKL Low-Battery Trickle Charge Time Percent of Total Charge Time, VBAT < 2.8V, 25 % Measured Using BATSENS and GNDSENS Pins ISS Soft-Start Ramp Current VBAT < VFLOAT – 100mV, VBAT Across BATSENS 6 12.8 16 µA and GNDSENS Pins VCOLD NTC Pin Cold Temperature Fault From NTC to GNDSENS Pin Threshold Rising Threshold 0.74 VINSENSE V Falling Threshold 0.72 VINSENSE V VHOT NTC Pin Hot Temperature Fault From NTC to GNDSENS Pin Threshold Falling Threshold 0.29 VINSENSE V Rising Threshold 0.30 VINSENSE V VDIS NTC Disable Threshold (Falling) From NTC to GNDSENS Pin 0.015 • 0.02 • 0.025 • V VINSENSE VINSENSE VINSENSE ∆VDIS NTC Disable Hysteresis From NTC to GNDSENS Pin 0.01 • VINSENSE V The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VIN = 5V, VEN = 0V, RPROG = 549Ω, RIDET = 549Ω, unless otherwise specified. ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Operation with current limited wall adapters is allowed down to the undervoltage lockout threshold. Note 3: The LTC4001E is guaranteed to meet performance specifications from 0 °C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 4: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • 37°C/W) Note 5: This IC includes overtemperature protection that is intended to protect the device during momentary overload. Junction temperature will exceed 125 °C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature my impair device reliability. |
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