CISPR 25 Class 4 Rated Design for Dual Automotive USB Charger Reference Design

(ACTIVE) PMP20249

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Key Document

Description

PMP20249 is an EMI optimized design for dual automotive USB charger system utilizing the LMS3635 and LMS3655 regulator ICs (400kHz fully-integrated synchronous buck for automotive application) and TPS2549 USB switch (TPS2549-Q1 automotive USB charging port controller with integrated power switch & cable compensation). The design accepts an input voltage range of 6V to 18V and provides the outputs of 5V@3.5A and 5V@2.5A. The design has a differential EMI filter, and has been tested for and passed CISPR25 Class 4 conducted EMI limits without shileding, a common mode choke, or a ferrite bead.

Features
  • Wide-Vin front end power supply for automotive USB charger system with dual 12.5W outputs
  • Off-battery operation with positive and negative over-voltage transient protection
  • Passed CISPR25 Class 4 conducted EMI test
  • All devices have an AEC-Q100 qualified version available
  • All devices switch outside of the AM and FM bands

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Schematic/Block Diagram

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Design Files

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Bill of Materials (BOM)

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Parametrics
 PMP20249.1
(Output Voltage 1)
Vin (Min) (V)6
Vin (Max) (V)18
Vout (Max) (V)5
Vout (Nom) (V)3.5
Iout (Max) (A)2.5
Output Power (W)8.75
Isolated/Non-IsolatedIsolated
Input TypeDC
TopologyBuck- Synchronous

TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LMS3635-Q1  3.5A /5.5A, 36V Synchronous, 400kHz, Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LMS3655  5.5A, 36V Synchronous, 400kHz, Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LMS3655-Q1  3.5A /5.5A, 36V Synchronous, 400kHz, Step-Down Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS2549-Q1  USB Charging Port Controller  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LMS3635-Q1 Download Download
LMS3655 Download Download
LMS3655-Q1 Download Download
TPS2549-Q1 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

Datasheet (1)
Title Abstract Type Size (KB) Date Views
PDF 2631 01 Mar 2018
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1165 11 Sep 2017 21
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 400 11 Sep 2017 23
ZIP 5418 11 Sep 2017 33
PDF 1023 11 Sep 2017 19
PDF 104 11 Sep 2017 11
PDF 101 11 Sep 2017 19
PDF 152 11 Sep 2017 40

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