Automotive USB charging

Products and reference designs

Automotive USB charging

Block diagram

Overview

Automotive universal serial bus (USB) charge, like the rest of the automotive industry, is constantly adapting to the fast-paced influence of the personal electronics market. We provide innovative reference designs and complementary integrated circuits (ICs) for media interfaces to connect external or internal media to a vehicle infotainment system, streamlining the design cycle and reducing time-to-market.

Design requirements

Automotive USB charge designs require:

  • Compatibility to smartphone interfaces that support the connected vehicle ecosystem and ports that support charge and data capabilities.
  • Signal integrity preserved across various cable lengths in automotive environments for USB 2.0 and USB 3.0 standards.
  • Devices with the ability to utilize high-power USB power delivery (PD).
  • Space efficiency to cope with increasing design complexity.

Block diagram

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Automotive USB charging

VBAT VBAT CC2 CC2 CC1 CC1 VBUS VBUS D+ D+ D- D- Tx +/- Tx +/- Rx +/- Rx +/- USB 3.0 port USB 3.0 port CC2 CC2 CC1 CC1 VBUS VBUS D+ D+ D- D- USB 3.0 port USB 3.0 port Tx +/- Tx +/- Rx +/- Rx +/- To head unit To head unit Tx +/- Tx +/- Rx +/- Rx +/- D+ D+ D- D- Off-battery power Off-battery power 2 2 USB 3.0 MUX USB 3.0 MUX USB 2.0 Redriver USB 2.0 Redriver Supervisor Supervisor 4 4 4 4 USB 2.0 redriver USB 2.0 redriver 2 2 2 2 USB 3.0 MUX USB 3.0 MUX 4 4 4 4 USB hub USB hub Tx +/- Tx +/- Rx +/- Rx +/- D+ D+ D- D- D+ D+ D- D- Tx +/- Tx +/- Rx +/- Rx +/- USB 3.0 redriver USB 3.0 redriver ESD ESD ESD ESD 2 2 USB data USB data USB port power 2 USB port power 2 USB power switch USB power switch CC negotiation CC negotiation CDP D+/D- negotiation CDP D+/D- negotiation ESD ESD 3.3V LDO 3.3V LDO Op amp Op amp Reverse battery protection Reverse batteryprotection 6A DC/DC buck 6ADC/DC buck Off-battery power Off-battery power CDP D+/D- negotiation CDP D+/D- negotiation CC negotiation CC negotiation USB power switch USB power switch ESD ESD Temp switch/sensor Tempswitch/sensor 3.3V LDO 3.3V LDO Op amp Op amp USB port power 1 USB port power 1

Technical documentation

View all 4
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Type Title Date
Technical article How to use dual buck controllers to power PMICs in automotive applications PDF | HTML 25 Sep 2023
Technical article Don’t let the name fool you – a passive media hub is an active part of your drivin PDF | HTML 23 Jul 2023
Selection guide Automotive Infotainment EE Buck Converter/Controller Selection Guide (Rev. B) 21 May 2021
Technical article There are more ways than you think to reduce conducted EMI PDF | HTML 14 Aug 2023

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