LT1431 elecTrical characTerisTicsThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C. IK = 10mA unless otherwise specified (Note 2)LT1431I, LT1431MLT1431CSYMBOLPARAMETERCONDITIONSMINTYPMAXMINTYPMAXUNITS VREF Reference Voltage VKA = 5V, IK = 2mA, (Note 3) 2.490 2.500 2.510 2.490 2.500 2.510 V l 2.465 2.535 2.480 2.520 V ∆VREF/∆T Reference Drift VKA = 5V, IK = 2mA l 50 30 ppm/°C ∆VREF/∆VKA Voltage Ratio, Reference to IK = 2mA, VKA = 3V to 36V l 0.2 0.5 0.2 0.5 mV/V Cathode (Open-Loop Gain) |IREF| Reference Input Current VKA = 5V, TA = 25°C 0.2 1.0 0.2 1.0 µA l 1.5 1.2 µA IMIN Minimum Operating Current VKA = VREF to 36V 0.6 1.0 0.6 1.0 mA |IOFF| Off-State Cathode Current VKA = 36V, VREF = 0V 1 1 µA l 15 2 µA |ILEAK| Off-State Collector Leakage Current VCOLL = 36V, V+ = 5V, VREF = 2.4V 1 1 µA l 5 2 µA |ZKA| Dynamic Impedance VKA = VREF, IK = 1mA to 100mA, f ≤ 1kHz 0.2 0.2 Ω ILIM Collector Current Limit VKA = VREF + 50mV l 80 360 100 260 mA 5V Reference Output Internal Divider Used, IK = 2mA 4.950 5.000 5.050 4.950 5.000 5.050 V Note 1: Stresses beyond those listed under Absolute Maximum Ratings LT1431CZ/IZ and corresponds to I(V+) + ICOLLECTOR of the LT1431CN8/ may cause permanent damage to the device. Exposure to any Absolute IN8/CS8/IS8. Maximum Rating condition for extended periods may affect device Note 3: The LT1431 has bias current cancel ation which is effective only reliability and lifetime. for VKA ≥ 3V. A slight (≈2mV) shift in reference voltage occurs when Note 2: VKA is the cathode voltage of the LT1431CZ/IZ and corresponds VKA drops below 3V. For this reason, these tests are not performed at to V+ of the LT1431CN8/IN8/CS8/IS8. IK is the cathode current of the VKA = VREF. 1431fe 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Schematic Diagram Package Description Revision History Package Description Related Parts
