SNOSDG3 December 2024 LM74681
PRODUCTION DATA
The LM74681 drives four external N-channel MOSFETs in a diode bridge configuration, making it ideal for rectifying power supplies of any polarity. By replacing traditional diodes with MOSFETs, the device minimizes conduction losses, resulting in improved thermal performance and increased overall system efficiency. OUTP UVLO feature of LM74681 makes it suitable for Power over Ethernet (PoE) applications. The schematic for a 48V POE PD application is shown in Figure 8-1 where the LM74681 is driving the high side MOSFETs Q1, Q2 and low side MOSFETs Q3, Q4 in diode bridge configuration.