The TPS5433xA family of devices are synchronous converters
with an input-voltage range of 4.5 to 28 V. These devices include an integrated low-side switching
FET that eliminates the need for an external diode which reduces component count.
Efficiency is maximized through the integrated 128-mΩ and 84-mΩ MOSFETs, low
IQ and pulse skipping at light loads. Using the enable pin, the shutdown
supply current is reduced to 2 μA. This step-down (buck) converter provides accurate regulation for
a variety of loads with a well-regulated voltage reference that is 1.5% over temperature.
Cycle-by-cycle current limiting on the high-side MOSFET protects the TPS5433xA
family of devices in overload situations and is enhanced by a low-side sourcing current limit which
prevents current runaway. A low-side sinking current-limit turns off the low-side MOSFET to prevent
excessive reverse current. Hiccup protection is triggered if the overcurrent condition continues
for longer than the preset time. Thermal shutdown disables the device when the die temperature
exceeds the threshold and enables the device again after the built-in thermal hiccup
time.
