The TPS4000x are controllers for low-voltage, non-isolated synchronous buck regulators. These controllers drive an N-channel MOSFET for the primary buck switch, and an N-channel MOSFET for the synchronous rectifier switch, thereby achieving very high-efficiency power conversion. In addition, the device controls the delays from main switch off to rectifier turn-on and from rectifier turn-off to main switch turn-on in such a way as to minimize diode losses (both conduction and recovery) in the synchronous rectifier with TI’s proprietary Predictive Gate Drive™ technology. The reduction in these losses is significant and increases efficiency. For a given converter power level, smaller FETs can be used, or heat sinking can be reduced or even eliminated.

The current-limit threshold is adjustable with a single resistor connected to the device. The TPS4000x controllers implement a closed-loop soft start function. Startup ramp time is set by a single external capacitor connected to the SS/SD pin. The SS/SD pin is also used for shutdown.

• Operating Input Voltage 2.25 V to 5.5 V
• Output Voltage as Low as 0.7 V
• 1% Internal 0.7 V Reference
• Predictive Gate Drive™ N-Channel MOSFET Drivers for Higher Efficiency
• Externally Adjustable Soft-Start and Overcurrent Limit
• Source-Only Current or Source/Sink Current
• Versions for Starting into VOUT Pre-Bias
• 10-Lead MSOP PowerPad™ Package for Higher Performance
• Thermal Shutdown
• Internal Boostrap Diode
• Fixed-Frequency, Voltage-Mode Control
  • TPS40000/1/4 300-kHz
  • TPS40002/3/5 600-kHz
• APPLICATIONS
  • Networking Equipment
  • Telecom Equipment
  • Base Stations
  • Servers
  • DSP Power
  • Power Modules

PowerPAD™ and Predictive Gate Drive™ are trademarks of Texas Instruments Incorporated.