SNOSDD8 December 2022 LM7480
PRODUCTION DATA
Connect a resistor ladder as shown in Figure 9-4 for overvoltage threshold programming.
A disconnect switch is integrated between VSNS and SW pins. This switch is turned OFF when EN/UVLO pin is pulled low. This helps to reduce the leakage current through the resistor divider network during system shutdown state (IGN_OFF state).
LM7480-Q1 OV pin can also be used as a control input to turn off HGATE drive to achieve load disconnect functionality. When OV pin is driven high (VOV > VOVR), device pulls down HGATE to OUT thus turning off the load disconnect MOSFET. When OV pin is pulled low (VOV < VOVF) HGATE drive is again enabled to trun on the load disconnect MOSFET. When OV pin is used as a control input to turn on/off load disconnect MOSFET, ensure device EN/UVLO pin is high (VEN/UVLO > VENR) and SW/VSNS pin voltage is higher than OV pin voltage.