Features Maximize Body Diode Conduction and Reverse Recovery Losses by Minimizing Efficiency Transparent Synchronous Buck Gate Drive Action by Single-Ended PWM Input Signal
12-V or 5 V input operation
3.3 V input operation availability Pin the PowerPAD Chong HTSSOP package reduces board area and junction temperature rise

Applications Non-isolated single or staged processor power supplies for DC-to-DC converters, general computer, telecom and datacom applications

describe
The UCC27221 and UCC27222 are high-efficiency, low-output voltage designs for today's high-speed synchronous buck drivers. Use a predictive gate driver? (PGD) control technology, these drivers reduce diode conduction and reverse recovery losses in synchronous rectifier MOSFET(s). The UCC27221 has one PWM input, while the UCC27222 has a non-inverting PWM input. Predicting gate drives? Through the use of control technology it is stable inside and the loop is therefore transparent to the user. These loops are used without external components, so no additional design is needed to take advantage of the high efficiency of these drivers. This closed-loop feedback system detects body diode conduction and adjusts dead-time delays to reduce conduction time intervals. This virtually eliminates the turn-on of the body diode while adjusting for temperature, load-dependent delays, and targeting different MOSFETs. Precise gate time in nanoseconds reduces the reverse recovery time of the synchronous rectifier to the body diode of the MOSFET, reducing the reverse recovery loss that occurs in the main (high side) MOSFET. The lower junction temperature at the low side of the MOSFET improves product reliability. As power consumption is minimized, higher switching frequencies can also be used, enabling new component sizes. Are the UCC27221 and UCC27222 available in a thermally enhanced 14-pin PowerPAD? Pack 2°C/W of θjc.