The TPS54478 device is a full featured 6 V, 4 A, synchronous step down current mode converter with two integrated MOSFETs.

The TPS54478 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2 MHz switching frequency, and minimizing the IC footprint with a small 3mm x 3mm thermally enhanced QFN package.

The TPS54478 provides accurate regulation for a variety of loads with an accurate ±1% Voltage Reference (VREF) over temperature.

Efficiency is maximized through the integrated 30mΩ MOSFETs and 525µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2.5µA by entering a shutdown mode.

Under voltage lockout is internally set at 2.6 V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage startup ramp is controlled by the slow start pin. An open drain power good signal indicates the output is within 93% to 107% of its nominal voltage.

Cycle-by-cycle current limit, hiccup overcuurent protection and thermal shutdown protect the device during an overcurrent condition.

The TPS54478 is supported in the SwitcherPro Software Tool at www.ti.com/switcherpro.

For more SWIFT™ documentation, see the TI website at www.ti.com/swift.

• Two 30-mΩ (typical) MOSFETs for High Efficiency at 4 A Loads
• 200kHz to 2MHz Switching Frequency
• 0.6 V ± 1% Voltage Reference Over Temperature (–40°C to 150°C)
• Start up with Pre-Biased Voltage
• Synchronizes to External Clock
• Adjustable Slow Start / Sequencing
• UV and OV Power Good Output
• Cycle by Cycle Current Limit and Hiccup Current Protection
• Thermally Enhanced 3mm × 3mm 16-pin QFN (RTE)
• Pin Compatible to TPS54418
• APPLICATIONS
  • Low-Voltage, High-Density Power Systems
  • Point of Load Regulation for High Performance DSPs, FPGAs, ASICs and Microprocessors
  • Broadband, Networking and Optical Communications Infrastructure