LTC4125 e lecTrical characTerisTics The l denotes the specifications which apply over the specified operatingjunction temperature range, otherwise specifications are at TA = 25°C. VIN = VIN1 = VIN2 = 5V unless otherwise noted (Notes 2, 3). SYMBOL PARAMETERCONDITIONSMINTYPMAXUNITSInput Current Limit and Monitoring VIS+,IS– Sense Voltage Offset –500 500 µV l –1.5 1.5 mV IS+ Pin Current VIS+ = 5V, VIS+,IS– = –50mV –100 100 nA IS– Pin Current VIS– = VIS+ = 5V 15 μA IMON Pin Leakage Current VIS+,IS– = –50mV, VIMON = 0V – 5V –100 100 nA VITH Input Current Comparator Threshold at IMON VIMON Rising l 0.785 0.800 0.815 V during Search VILIM Input Current Limit Comparator Threshold at VIMON Rising l 1.175 1.200 1.225 V IMON during Delay Time Input Current Limit Comparator Hysteresis 40 mV Thermistor Input NTC Hot Threshold VNTC Falling, % of VIN l 33 35 37 % VIN NTC Thresholds Hysteresis % of VIN 5 % VIN NTC Open Circuit Voltage % of VIN l 48 50 52 % VIN NTC Open Circuit Input Resistance 300 kΩ Open Drain Status Pin STAT Pin Leakage Current VSTAT = 5V –1 1 μA STAT Pin Output Voltage Low ISTAT = 1mA l 0.4 V Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note that the maximum ambient temperature consistent with these may cause permanent damage to the device. Exposure to any Absolute specifications is determined by specific operating conditions in Maximum Rating condition for extended periods may affect device conjunction with board layout, the rated package thermal impedance and reliability and lifetime. other environmental factors. This IC includes over temperature protection Note 2: The LTC4125 is tested under conditions such that T that is intended to protect the device during momentary SW MOSFETs J ≈ TA. The LTC4125E is guaranteed to meet specifications from 0°C to 85°C junction over current situation. Junction temperature will exceed 125°C when over temperature. Specifications over the -40°C to 125°C operating junction temperature protection is active. Continuous operation above the specified temperature are assured by design, characterization and correlation maximum operating junction temperature may impair device reliability. with statistical process controls. The LTC4125I is guaranteed over the Note 3: All currents into pins are positive; all voltages are referenced to full -40°C to 125°C operating junction temperature range. The junction GND unless otherwise noted. temperature (TJ, in °C) is calculated from the ambient temperature (TA, Note 4: This IC includes overtemperature protection that is intended in °C) and power dissipation (PD, in Watts) according to the following to protect the device. Junction temperature will exceed 125°C when formula: overtemperature protection is active. Continuous operation above the TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal specified maximum operating junction temperature will reduce lifetime. impedance. 4125f 4 For more information www.linear.com/LTC4125 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
