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
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
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
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