UCC27221 Not Recommended For New Designs
UCC27221 UCC27222
SLUS486B − AUGUST 2001 − REVISED JULY 2003
HIGHĆEFFICIENCY...
UCC27221 Not Recommended For New Designs
UCC27221 UCC27222
SLUS486B − AUGUST 2001 − REVISED JULY 2003
HIGHĆEFFICIENCY PREDICTIVE SYNCHRONOUS BUCK DRIVER
FEATURES
APPLICATIONS
D Maximizes Efficiency by Minimizing
Body-Diode Conduction and Reverse Recovery Losses
D Transparent Synchronous Buck Gate Drive
Operation From the Single Ended PWM Input Signal
D 12-V or 5-V Input Operation D 3.3-V Input Operation With Availability of
12-V Bus Bias
D On-Board 6.5-V Gate Drive Regulator D ±3.3-A TrueDrive Gate Drives for High
Current Delivery at
MOSFET Miller Thresholds
D Automatically Adjusts for Changing
Operating Conditions
D Thermally Enhanced 14-Pin PowerPAD
HTSSOP Package Minimizes Board Area and Junction Temperature Rise
FUNCTIONAL APPLICATION DIAGRAM
D Non-Isolated Single or Multi-phased
DC-to-DC Converters for Processor Power, General Computer, Telecom and Datacom Applications
DESCRIPTION
The UCC27221 and UCC27222 are high-speed synchronous buck drivers for today’s high-efficiency, lower-output
voltage designs. Using Predictive Gate Drivet (PGD) control technology, these drivers reduce diode conduction and reverse recovery losses in the synchronous rectifier
MOSFET(s). The UCC27221 has an inverted PWM input while the UCC27222 has a non-inverting PWM input.
Predictive Gate Drivet technology uses control loops which are stabilized internally and are therefore transparent to the user. These loops use no external components, so no additional design is needed to take advanta...