SNOSDD9 December 2022 LM7481
PRODUCTION DATA
A, C, DGATE comprises of Ideal Diode stage. Connect the Source of the external MOSFET to A, Drain to C and Gate to DGATE. The LM74810 has integrated reverse input protection down to –65 V.
Before the DGATE driver is enabled, following conditions must be achieved:
In LM74810 the voltage drop across the MOSFET is continuously monitored between the A and C pins, and the DGATE to A voltage is adjusted as needed to regulate the forward voltage drop at 9.1 mV (typ). This closed loop regulation scheme enables graceful turn off of the MOSFET during a reverse current event and ensures zero DC reverse current flow. This scheme ensures robust performance during slow input voltage ramp down tests. Along with the linear regulation amplifier scheme, the LM74810 also integrates a fast reverse voltage comparator. When the voltage drop across A and C reaches V(AC_REV) threshold then the DGATE goes low within 0.5-µs (typ). This fast reverse voltage comparator scheme ensures robust performance during fast input voltage ramp down tests such as input micro-shorts. The external MOSFET is turned ON back when the voltage across A and C hits V(AC_FWD) threshold within 0.85 µs (typ).
For Ideal Diode only designs, connect LM74810 as shown in Figure 8-2.