●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 × 3mm thermally enhanced WQFN 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 30-mΩ MOSFETs and 525-µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2.5 µA 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 overcurrent 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
● 200-kHz to 2-MHz 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 WQFN (RTE)
● Pin Compatible to TPS54418
