Power Management TPS28225 8-Pin High Frequency 4-Amp Sink Synchronous MOSFET Driver

• Drives Two N-Channel MOSFETs with 14-ns Adaptive Dead Time
• Wide Gate Drive Voltage: 4.5V Up to 8.8V With Best Efficiency at 7V to 8V
• Wide Power System Train Input Voltage: 3V Up to 27V
• Wide Input PWM Signals: 2.0V up to 13.2-V Amplitude
• Capable Drive MOSFETs with 40-A Current per Phase
• High Frequency Operation: 14ns Propagation Delay and 10ns Rise/Fall Time Allow Fsw - 2MHz
• Capable Propagate <30-ns Input PWM Pulses
• Low-Side Driver Sink On-Resistance (0.4) Prevents dV/dT Related Shoot-Through Current
• 3-State PWM Input for Power Stage Shutdown
• Space Saving Enable (input) and Power Good (output) Signals on Same Pin
• Thermal Shutdown
• UVLO Protection
• Internal Bootstrap Diode
• Economical SOIC-8 and Thermally Enhanced 3-mm x 3-mm DFN-8 Packages
• High Performance Replacement for Popular 3-State Input Drivers
• APPLICATIONS
  • Multi-Phase DC-to-DC Converters with Analog or Digital Control
  • Desktop and Server VRMs and EVRDs
  • Portable/Notebook Regulators
  • Synchronous Rectification for Isolated Power Supplies

The TPS28225 is a high-speed driver for N-channel complimentary driven power MOSFETs with adaptive dead-time control. This driver is optimized for use in variety of high-current one and multi-phase dc-to-dc converters. The TPS28225 is a solution that provides highly efficient, small size low EMI emmissions.

The performance is achieved by up to 8.8-V gate drive voltage, 14-ns adaptive dead-time control, 14-ns propagation delays and high-current 2-A source and 4-A sink drive capability. The 0.4- impedance for the lower gate driver holds the gate of power MOSFET below its threshold and ensures no shoot-through current at high dV/dt phase node transitions. The bootstrap capacitor charged by an internal diode allows use of N-channel MOSFETs in half-bridge configuration.

The TPS28225 features a 3-state PWM input compatible with all multi-phase controllers employing 3-state output feature. As long as the input stays within 3-state window for the 250-ns hold-off time, the driver switches both outputs low. This shutdown mode prevents a load from the reversed- output-voltage.

The other features include under voltage lockout, thermal shutdown and two-way enable/power good signal. Systems without 3-state featured controllers can use enable/power good input/output to hold both outputs low during shutting down.

The TPS28225 is offered in an economical SOIC-8 and thermally enhanced low-size Dual Flat No-Lead (DFN-8) packages. The driver is specified in the extended temperature range of -40°C to 125°C with the absolute maximum junction temperature 150°C.