Datasheet

TPS54519
SLVSAT3A –SEPTEMBER 2011–REVISED DECEMBER 2013 www.ti.com
The TPS54519 reduces the external component count by integrating the boot recharge diode. The bias voltage
for the integrated high side MOSFET is supplied by a capacitor on the BOOT to PH pin. The boot capacitor
voltage is monitored by an UVLO circuit and turns off the high side MOSFET when the voltage falls below a
preset threshold. This BOOT circuit allows the TPS54519 to operate approaching 100%. The output voltage can
be stepped down to as low as the 0.6 V reference.
The TPS54519 has a power good comparator (PWRGD) with 2% hysteresis.
The TPS54519 minimizes excessive output overvoltage transients by taking advantage of the overvoltage power
good comparator. When the regulated output voltage is greater than 107% of the nominal voltage, the
overvoltage comparator is activated, and the high side MOSFET is turned off and masked from turning on until
the output voltage is lower than 105%.
The SS/TR pin is used to minimize inrush currents or provide power supply sequencing during power up. A small
value capacitor should be coupled to the pin for slow start. The SS/TR pin is discharged before the output power
up to ensure a repeatable restart after an over-temperature fault, UVLO fault or disabled condition.
The use of a frequency foldback circuit reduces the switching frequency during startup and over current fault
conditions to help limit the inductor current.
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