Texas Instruments Inc. (TI, Dallas, TX) introduced two new synchronous buck drivers for high-efficiency, non-isolated, low output voltage, dc/dc converters, the UCC27221 and UCC27222, which providing system power designers with up to four percent more efficiency and up to 40 percent improved heat dissipation. Each driver can be used with 12V or 5V input systems, or with 3.3V input systems with higher bias rail, to generate lower output voltages for central processing units, general computers, data communications, telecommunications and general merchant power supply applications.
The UCC27221 and UCC27222 drivers, which produce ±3A of output drive current for efficient power MOSFET switching at the critical Miller plateau region, employ TI's Predictive Gate Drive™ control technology to reduce diode conduction and reverse recovery losses in the synchronous rectifier MOSFETs. The technology employs a closed-loop feedback system that detects body-diode conduction, and adjusts dead time delays in the next switching cycle to minimize the conduction time interval in synchronous rectifiers.
Evaluation modules of the UCC27221 and UCC27222 are currently available
in volume in a thermally enhanced, low-profile, HTSSOP-14 PowerPAD™ package. Pricing in quantities of 1,000 units is $1.25.
