The TPS54424 is a
full featured 17-V, 4-A synchronous
step-down DC/DC converter in a 3.5 mm x 3.5 mm HotRod™ QFN package.
The device is optimized for small solution size through high efficiency and integrating
the high-side and low-side MOSFETs. Further space savings are achieved through peak current mode
control, which reduces component count, and by selecting a high switching frequency, reducing the
The peak current mode control simplifies the loop compensation and provides fast
transient response. Cycle-by-cycle peak current limiting on the high-side and low-side sourcing
current limit protects the device in overload situations. Hiccup limits MOSFET power dissipation if
a short circuit or over loading fault persists.
A power good supervisor circuit monitors the regulator output. The PGOOD pin is an open
drain output and goes high impedance when the output voltage is in regulation. An internal deglitch
time prevents the PGOOD pin from pulling low unless a fault has occurred.
A dedicated EN pin can be used to control the regulator on/off and adjust the input under
voltage lockout. The output voltage startup ramp is controlled by the SS/TRK pin which allows
operation as either a standalone power supply or in tracking situations.
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