UCC2541

UCC2541 ą SLUS621A − AUGUST 2004 − SEPTEMBER 2005 HIGHĆEFFICIENCY SYNCHRONOUS BUCK PWM CONTROLLER FEATURES D On-Chip Predictive Gate Drivet for High-Efficiency Synchronous Buck Operation D Dual ±3-A TrueDrivet Outputs D On-Board Programmable Oscillator with 1-MHz Frequency Operation D TR Input for Sequencing Operation D Overcurrent Protection using a Parallel Average Current Mode Control Loop D 3 Modes to Support 2.7-V to 35-V Input Bias D Reverse Current Protection for Output Stage D User Programmable Shutdown Using SS Pin D ±1.0% Initial Tolerance Bandgap Reference D High Bandwidth Error Amplifiers D Thermally Enhanced HTSSOP 20-Pin PowerPADt Package and QFN−32 Pin D Synchronization Input D Supports Pre-Bias Applications SIMPLIFIED APPLICATION DIAGRAM 1 RSET UCC2541 SWS 20 2 REF BST 19 3 G2C G1 18 4 SYNCIN SW 17 5 RAMP VDD 16 6 GND PGND 15 7 VEA− G2 14 8 CEA− VDRV 13 9 COMP G2S 12 TR Input 10 TR SS 11 APPLICATIONS D High Efficiency Non-Isolated Converters Requiring Advanced Features such as Pre-Bias Support and Tracking Capability D Point-of-Load Modules for Servers, Telecom, and Data communication Equipments D Good for Input Voltages of 3.3 V, 5.0 V, 12.0 V, or Intermediate Bus Voltages DESCRIPTION The UCC2541 is a synchronous buck PWM controller for high current and low output voltage applications. For higher efficiency, it incorporates the Predictive Gate Drivet technology that virtually eliminates body diode conduction losses in synchronous rectif...