Datasheet LTC4418 (Linear Technology) - 8

LTC4418
PIN FUNCTIONS EN (Pin 18):
Channel Enable Input. EN is a 40V input timers used to validate V1 and V2. CAS is pulled high to that allows the user to quickly connect and disconnect allow lower priority LTC4417/LTC4418s in a cascaded channels without resetting the OV/UV Validation timer. system to provide power to VOUT. Driving SHDN above This feature is essential in cascading applications. When 1V (VSHDN(TH)) allows channels to validate and connect. below 1V (VEN(TH)), both external P-channel MOSFETs are SHDN is pulled high to INTVCC with a 3.2µA current source driven off by pulling G1 and G2 to their respective VS1 (ICTRL) and can be pulled up externally to a maximum and VS2. When above VEN(TH), the highest valid priority voltage of 40V. Connect to INTVCC when not used. channel is connected to the output. EN is pulled to INTVCC
HYS (Pin 20):
OV/UV Comparator Hysteresis Input. Con- with a 3.2µA current source (ICTRL) and can be pulled necting HYS to ground sets a fixed hysteresis (V up externally to a maximum voltage of 40V. Connect to HYS(INT)) for the OV and UV comparators. Connecting a resistor, R INTV HYS, CC when not used. between HYS and ground disables the internal hysteresis
SHDN (Pin 19):
Shutdown Input. Driving SHDN below and sets a 63mV/RHYS hysteresis current which is sourced VSHDN(TH) turns off all external P-channel MOSFETs, dis- from each OV1 and OV2 and sunk into each UV1 and UV2 ables the OV/UV comparators and resets the validation pin. Connect to GND if not used. 4418f 8 For more information www.linear.com/LTC4418 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts