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TPS54519RTER Fiches technique(PDF) 9 Page - Texas Instruments

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No de pièce TPS54519RTER
Description  2.95 V to 6 V Input, 5-A Synchronous Step Down SWIFT Converter
Download  33 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS54519RTER Fiches technique(HTML) 9 Page - Texas Instruments

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Vsense (Good) Falling
Vsense (Fault) Rising
Vsense (Fault) Rising
Vsense (Good) Falling
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T - Junction Temperature - °C
J
TPS54519
www.ti.com
SLVSAT3
– SEPTEMBER 2011
TYPICAL CHARACTERISTICS CURVES (continued)
PWRGD THRESHOLD vs TEMPERATURE
Figure 15.
OVERVIEW
The TPS54519 is a 6-V, 5-A, synchronous step-down (buck) converter with two integrated n-channel MOSFETs.
To improve performance during line and load transients the device implements a constant frequency, peak
current mode control which reduces output capacitance and simplifies external frequency compensation design.
The wide switching frequency of 200 kHz to 2000 kHz allows for efficiency and size optimization when selecting
the output filter components. The switching frequency is adjusted using a resistor to ground on the RT pin.
The TPS54519 has a typical default start up voltage of 2.6 V. The EN pin has an internal pull-up current source
that can be used to adjust the input voltage under voltage lockout (UVLO) with two external resistors. In addition,
the pull up current provides a default condition when the EN pin is floating for the device to operate. The total
operating current for the TPS54519 is 455
μA when not switching and under no load. When the device is
disabled, the supply current is less than 5
μA.
The integrated 30 m
Ω MOSFETs allow for high efficiency power supply designs with continuous output currents
up to 5 amperes.
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.
Copyright
© 2011, Texas Instruments Incorporated
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