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TPS65288RHAT Datasheet(PDF) 2 Page - Texas Instruments

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Part # TPS65288RHAT
Description  4.5-V to 18-V Input, High Current, Synchronous Step Down Three DC-DC Converter with Integrated FET
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65288RHAT Datasheet(HTML) 2 Page - Texas Instruments

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TPS65288
SLVSBX3 – MAY 2013
www.ti.com
The device incorporates an overvoltage transient protection circuit to minimize voltage overshoot. The OVP
feature minimizes the output overshoot by implementing a circuit to compare the FB pin voltage to OVP threshold
which is 106% of the internal voltage reference. If the FB pin voltage is greater than the OVTP threshold, the
high side MOSFET is disabled preventing current from flowing to the output and minimizing output overshoot.
When the FB voltage drops lower than the OVP lower threshold which is 104%, the high side MOSFET is
allowed to turn on the next clock cycle.
TPS65288 features a supervisor circuit which monitors each buck’s output and the PGOOD pin is asserted once
sequencing is done. The PGOOD pin is an open drain output. The PGOOD pin is pulled low when any buck
converter is pulled below 85% of the nominal output voltage. The PGOOD is pulled up when all converter outputs
are more than 90% of its nominal output voltage. The default reset time is 100 ms. The polarity of the PGOOD is
active high.
The 2 USB switches provide up to 1.2A of current as required by downstream USB devices. When the output
load exceeds the current-limit threshold or a short is present, the PMU limits the output current to a safe level by
switching into a constant-current mode and pulling the over current logic output low. When continuous heavy
overloads or short circuits increase the power dissipation in the switch, causing the junction temperature to rise,
a thermal warning protection circuit shuts off the USB switch and allows the buck converters to carry on
operating.
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 160°C.
The thermal shutdown forces the device to stop operating when the junction temperature exceeds thermal trip
threshold. Once the die temperature decreases below 140°C, the device reinitiates the power up sequence. The
thermal shutdown hysteresis is 20°C.
ORDERING INFORMATION(1)
TA
PACKAGE(2)
PART NUMBER
TOP-SIDE MARKING
-40°C to 125°C
40-Pin (QFN) - RHA
Reel of 2500
TPS65288RHAR
TPS65288
(1)
For the most current packaging and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2)
Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
2
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Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: TPS65288


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