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TPS254900AIRVCTQ1 Datasheet(PDF) 22 Page - Texas Instruments

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Part No. TPS254900AIRVCTQ1
Description  Automotive USB Host Charger With Short-to-VBATT Protection
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS254900AIRVCTQ1 Datasheet(HTML) 22 Page - Texas Instruments

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OS(max)
0.9987
(ILIM _ xx)
51 820 V
I
(mA)
38
R
k
=
+
W
OS(min)
0.9974
(ILIM _ xx)
46 464 V
I
(mA)
32
R
k
=
-
W
OS(nom)
0.9945
(ILIM _ xx)
48 687 V
I
(mA)
R
k
=
W
22
TPS254900A-Q1
SLUSCU5A – NOVEMBER 2017 – REVISED JANUARY 2018
www.ti.com
Product Folder Links: TPS254900A-Q1
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Copyright © 2017–2018, Texas Instruments Incorporated
8.3.8 Undervoltage Lockout
The undervoltage-lockout (UVLO) circuit disables the power switch until the input voltage reaches the UVLO
turnon threshold. Built-in hysteresis prevents unwanted oscillations on the output due to input voltage drop from
large current surges.
8.3.9 Thermal Sensing
Two independent thermal-sensing circuits protect the TPS254900A-Q1 device if the temperature exceeds
recommended operating conditions. These circuits monitor the operating temperature of the power-distribution
switch and disable operation. The power dissipation in the package is proportional to the voltage drop across the
power switch, so the junction temperature rises during an overcurrent condition. The first thermal sensor turns off
the power switch when the die temperature exceeds 135ºC and the device is in current limit. The second thermal
sensor turns off the power switch when the die temperature exceeds 155ºC regardless of whether the power
switch is in current limit. Hysteresis is built into both thermal sensors, and the switch turns on after the device
has cooled by approximately 20°C. The switch continues to cycle off and then on until the fault is removed. The
open-drain false-reporting output, FAULT, is asserted (low) during an overtemperature shutdown condition.
8.3.10 Current-Limit Setting
The TPS254900A-Q1 has two independent current-limit settings that are each adjusted externally with a resistor.
The ILIM_HI setting is adjusted with R(ILIM_HI) connected between ILIM_HI and GND. The ILIM_LO setting is
adjusted with R(ILIM_LO) connected between ILIM_LO and GND. Consult the device truth table (Table 3) to see
when each current limit is used. Both settings have the same relation between the current limit and the adjusting
resistor.
The following equation calculates the value of resistor for adjusting the typical current limit:
(3)
Many applications require that the current limit meet specific tolerance limits. When designing to these tolerance
limits, both the tolerance of the TPS254900A-Q1 current limit and the tolerance of the external adjusting resistor
must be taken into account. The following equations approximate the TPS254900A-Q1 minimum and maximum
current limits to within a few milliamperes and are appropriate for design purposes. The equations do not
constitute part of TI’s published device specifications for purposes of TI’s product warranty. These equations
assume an ideal—no variation—external adjusting resistor. To take resistor tolerance into account, first
determine the minimum and maximum resistor values based on its tolerance specifications and use these values
in the equations. Because of the inverse relation between the current limit and the adjusting resistor, use the
maximum resistor value in the IOS(min) equation and the minimum resistor value in the IOS(max) equation.
(4)
(5)


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