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TPS254900AIRVCTQ1 Datasheet(PDF) 18 Page - Texas Instruments

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Part No. TPS254900AIRVCTQ1
Description  Automotive USB Host Charger With Short-to-VBATT Protection
Download  39 Pages
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS254900AIRVCTQ1 Datasheet(HTML) 18 Page - Texas Instruments

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0
0.5
V
(OUT) With Compensation
V
(DROP)
5.x
V
BUS With Compensation
V
BUS Without Compensation
1
1.5
2
2.5
3
I
(OUT) (A)
18
TPS254900A-Q1
SLUSCU5A – NOVEMBER 2017 – REVISED JANUARY 2018
www.ti.com
Product Folder Links: TPS254900A-Q1
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
Feature Description (continued)
Table 1. Fault Conditions
EVENT
CONDITION
ACTION
Overvoltage on the data lines
V(DP_IN) or V(DM_IN) > 3.9 V
The device immediately shuts off the USB data switches and
the internal power switch. The fault indicator asserts with a
16-ms deglitch, and deasserts without deglitch.
Overvoltage on V(OUT)
V(OUT) > 6 V or 6.95 V
The device immediately shuts off the internal power switch
and the USB data switches. The fault indicator asserts with a
16-ms deglitch and deasserts without deglitch.
Overcurrent on V(OUT)
I(OUT) > I(OS)
The device regulates switch current at I(OS) until thermal
cycling occurs. The fault indicator asserts and deasserts with
an 8-ms deglitch (the device does not assert FAULT on
overcurrent in SDP1 mode).
Overtemperature
TJ > OTSD2 in non-current-limited or TJ
> OTSD1 in current-limited mode.
The device immediately shuts off the internal power switch
and the USB data switches. The fault indicator asserts
immediately when the junction temperature exceeds OTSD2
or OTSD1 while in a current-limiting condition. The device
has a thermal hysteresis of 20°C.
8.3.2 Cable Compensation
When a load draws current through a long or thin wire, there is an IR drop that reduces the voltage delivered to
the load. In the vehicle from the voltage regulator 5-V output to the VPD_IN (input voltage of portable device), the
total resistance of power switch rDS(on) and cable resistance causes an IR drop at the PD input. So the charging
current of most portable devices is less than their expected maximum charging current.
Figure 37. Voltage Drop
The TPS254900A-Q1 device detects the load current and applies a proportional sink current that can be used to
adjust the output voltage of the upstream regulator to compensate for the IR drop in the charging path. The gain
G(CS) of the sink current proportional to load current is 82 µA/A.


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