For the 7V, 17A SynchroFET™ complementary permanent magnet synchronous half-bridge design using P6 and Pentium® Remember, Intersil's SynchroFET™ family provides a new way to implement synchronous rectification step-down switching regulators. The SynchroFET replaces two power DMOSs, Schottky diodes, two gate drivers and a synchronous control circuit. The complementary drive circuit is turned on and the lower FET on the FET is turned off, driven high by the PWM input. When the PWM input goes low the upper FET turns off and the lower FET turns on. The HIP5011 has a PWM pin that inverts the slave-to-phase input relationship. This architecture allows designers to utilize a low-cost single-ended PWM in either a controller current or voltage mode configuration. The SynchroFET operates in continuous conduction mode to reduce EMI limitations and enable high bandwidth operation. Several features ensure a smooth startup. First, the supply current is kept below the specified supply voltage ramp without the possibility of unexpected surges interfering with soft-start or depleting the charge pump. Second, any power-up sequence on the VCC, VIN, or PWM pins can be used without causing large currents. Third, the chip works when VCC is greater than 2V so it can create a charge for VCC from pumping power from VIN. ...

Features • Complementary drive, NMOS for half-bridge power supply
• Uses a low cost single output PWM controller • Improves efficiency over conventional buck converters with Schottky clamp • Provides lowest adaptive dead time shoot-through without external Schottky protection • Ground case for low EMI and simple heat dissipation • Low operating current • Frequency over 1MHz • Bipolar input option • Surge protection on all pins

Applications • 5V to 3.3V Synchronous Buck Converter Pound • Pentium and P6 Power • Power for PowerPC™
• Bus termination (BTL and GTL)
• The motor is driven directly by 5V from the microprocessor...