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TPS254900A-Q1 Datasheet(PDF) 16 Page - Texas Instruments

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Part No. TPS254900A-Q1
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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TPS254900A-Q1 Datasheet(HTML) 16 Page - Texas Instruments

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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 Detailed Description
8.1 Overview
The TPS254900A-Q1 device is a USB charging controller and power switch which integrates D+ and D– short-to-
battery protection, cable compensation, current monitor (IMON), and IEC ESD protection suitable for automotive
USB charging and USB port protection applications.
The integrated power distribution switch uses N-channel MOSFETs suitable for applications where short circuits
or heavy capacitive loads will be encountered. The device allows the user to adjust the current-limit thresholds
using external resistors. The device enters constant-current mode when the load exceeds the current-limit
threshold.
The TPS254900A-Q1 device provides VBUS, D+, and D– short-to-battery protection. This protects the upstream
voltage regulator, automotive processor, and hub when these pins are exposed to fault conditions.
The device also integrates CDP mode, defined in the BC1.2 specification, to enable up to 1.5-A fast charging of
most portable devices during data communication.
The TPS254900A-Q1 device integrates a cable compensation (CS) feature to compensate for long-cable voltage
drop. This keeps the remote USB port output voltage constant to enhance the user experience under high-
current charging conditions.
The TPS254900A-Q1 device provides a current-monitor function (IMON) by connecting a resistor from the IMON
pin to GND to provide a positive voltage linearly with load current. This can be used for system power or dynamic
power management.
Additionally, the device provides ESD protection up to ±8 kV (contact discharge) and ±15 kV (air discharge) per
IEC 61000-4-2 on DP_IN and DM_IN.


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