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LTC4079 Datasheet(PDF) 4 Page - Linear Technology |
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LTC4079 Datasheet(HTML) 4 Page - Linear Technology |
4 / 20 page LTC4079 4 4079f For more information www.linear.com/LTC4079 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS NTC Temp Monitor VCOLD Low Temp. Fault NTC Threshold Voltage VNTC/VNTCBIAS l 72.3 73.8 75.3 % VHOT High Temp. Fault NTC Threshold Voltage VNTC/VNTCBIAS l 35.6 36.6 37.6 % VNTC(DIS) NTC Disable Voltage Threshold VNTC l 60 80 100 mV Pulsed NTCBIAS Voltage 20k from NTCBIAS to Ground 4 V NTCBIAS Period 3 Sec NTCBIAS Pulse Width 210 µs NTC Input Leakage Current VNTC = VNTCBIAS l 0.1 100 nA Enable Input (EN) VEN(SD) Shutdown Threshold VEN Falling Hysteresis l 0.400 0.750 55 1.100 V mV VEN(REG) Enable Pin Regulation Voltage Minimum VEN for Charge Current l 1.170 1.190 1.210 V Enable Pin Leakage Current When Pulled High VEN = 60V l 0 20 nA Status Outputs (CHRG) Output Low Voltage 1mA Into the Open-Drain Output l 0.16 0.4 V Output Leakage Current VCHRG = 60V, VEN = 0V l 0.1 100 nA elecTrical characTerisTics The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 3). VIN = 12V, VBAT = 7.4V, VFB = 1.057V, VEN = 12V, RPROG = 3k (100mA charge current) unless otherwise specified. 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: Unless otherwise specified, current into a pin is positive and current out of a pin is negative. Note 3: The LTC4079 is tested under pulsed load conditions such that TJ ≈ TA. The LTC4079E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC4079I is guaranteed over the full –40°C to 125°C operating junction temperature range. Note that the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors. Note 4: BAT pin charge current, PROG pin and feedback divider currents are excluded from supply quiescent current. Note 5: Charge current is reduced by thermal regulation as the junction temperature rises above TLIM (118°C). |
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