SNOSDG3 December 2024 LM74681
PRODUCTION DATA
For the LM74681 to operate its top gates TG1 and TG2 in full conduction mode the gate driver must be enabled as described in Section 7.3.3 and the current from source to drain of the external MOSFET must be large enough to result in an INx to OUTP voltage drop of greater than VTG_FC. If these conditions are achieved the GATE pin is internally connected to the charge pump resulting in the INx to OUTP voltage being equal to VTGx – VINx. By connecting the internal charge pump to GATE the external MOSFET RDS(ON) is minimized reducing the power loss of the external MOSFET when forward currents are large.