资 源 简 介
The LM27222 is a dual N-channel MOSFET driver designedto drive MOSFETs in push-pull configuraTIons as typicallyused in synchronous buck regulators. The LM27222 takesthe PWM output from a controller and provides the properTIming and drive levels to the power stage MOSFETs. AdapTIveshoot-through protecTIon prevents damaging and efficiencyreducing shoot-through currents, thus ensuring a robustdesign capable of being used with nearly any MOSFET.The adaptive shoot-through protection circuitry also reducesthe dead time down to as low as 10ns, ensuring the highestoperating efficiency. The peak sourcing and sinking currentfor each driver of the LM27222 is about 3A and 4.5Ampsrespectively with a Vgs of 5V. System performance is alsoenhanced by keeping propagation delays down to 8ns. Efficiencyis once again improved at all load currents by supportingsynchronous, non-synchronous, and diode emulationmodes through the LEN pin. The minimum output pulsewidth realized at the output of the MOSFETs is as low as30ns. This enables high operating frequencies at very highconversion ratios in buck regulator designs. To support lowpower states in notebook systems, the LM27222 draws only5μA from the 5V rail when the IN and LEN inputs are low orfloating.
