1/22/2004 - Texas Instruments Incorporated (TI) (NYSE: TXN) announced it is adding an Enable pin to its widely adopted line of high efficiency synchronous buck drivers for non-isolated, low output voltage DC/DC converters. Providing a new driver with Enable gives system power designers improved flexibility and control when managing low output voltages in central processing units (CPUs), computing, telecom, datacom and general merchant power supply systems.
The new UCC27223 driver with Enable, and the previously announced UCC27221 and UCC27222 devices produce ±3 A of output drive current for efficient power MOSFET switching at critical Miller plateau thresholds. The UCC2722x family yields two to four percent better efficiency and up to 40 percent improved heat dissipation compared to competing ICs that support low output voltages.
The UCC27223 device's Enable pin and proprietary Predictive Gate Drive digital control technology reduce diode conduction and reverse recovery losses in synchronous rectifier MOSFETs. Employing a closed loop feedback system that detects body-diode conduction, Predictive Gate Drive adjusts dead time delays in the next switching cycle to minimize the conduction time interval in synchronous rectifiers. In addition, the overall converter efficiency improves up to two to four percent.
The new driver incorporates TI´s hybrid TrueDriveTM output stage with paralleled bipolar and complementary metal-oxide semiconductor (CMOS) transistors to allow efficient current delivery at low supply voltages.
Key Features of UCC27223:
The UCC2722x drivers are available in volume from TI and its authorized distributors in a thermally enhanced low profile HTSSOP-14 PowerPADTM (PWP) packages. Suggested resale pricing of the UCC27223 device with Enable in quantities of 1,000 units is $1.25. TI´s new VIP online selection tool, evaluation modules, user guides and application notes on Predictive Gate Drive and predictive, synchronous buck drivers are currently available at power.ti.com.
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