Texas Instruments TPS254900AQ1EVM-003 User manual

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TPS254900AQ1EVM-003 Evaluation Module
User's Guide
SLVUB94–October 2017
TPS254900AQ1EVM-003 Evaluation Module
This user’s guide describes the evaluation module (EVM) for the TPS254900A-Q1 (TPS254900AQ1EVM-
003). The TPS254900A-Q1 is a USB charging port controller with an integrated power switch and USB 2.0
high-speed data line (DP and DM) switches.
Contents
1 Introduction ................................................................................................................... 2
2 Description.................................................................................................................... 2
3 Schematic..................................................................................................................... 3
4 General Configuration and Description ................................................................................... 4
5 EVM Assembly Drawings and Layout Guidelines ....................................................................... 6
6 Bill of Materials............................................................................................................... 9
List of Figures
1 TPS254900AQ1EVM-003 Schematic..................................................................................... 3
2 Typical TPS254900AQ1EVM-003 Test Setup........................................................................... 5
3 Top Side Placement......................................................................................................... 6
4 Top Side Routing ............................................................................................................ 6
5 Layer Two Routing .......................................................................................................... 6
6 Layer Three Routing ........................................................................................................ 6
7 Bottom Side Routing ........................................................................................................ 7
8 Bottom Side Placement..................................................................................................... 7
List of Tables
1 Connector Functionality..................................................................................................... 4
2 Test Points.................................................................................................................... 4
3 Jumpers....................................................................................................................... 4
4 TPS254900AQ1EVM-003 Bill of Materials ............................................................................... 9
Trademarks
All trademarks are the property of their respective owners.

Introduction www.ti.com
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TPS254900AQ1EVM-003 Evaluation Module
1 Introduction
The TPS254900AQ1EVM-003 allows reference circuit evaluation of TI's TPS254900A-Q1 automotive USB
charging port controller with integrated power switch, cable compensation, and short-to-battery protection.
The TPS254900AQ1EVM-003 provides the electrical signatures on DP_IN and DM_IN to support all
current charging schemes. The TPS254900A-Q1 incorporates USB cable voltage drop compensation by
linearly sensing the port current and automatically adjusting the output voltage of the LMR14030SDDAR to
keep the cable end device voltage within the normal operating range. The TPS254900A-Q1 incorporates
up to an 18-V short to battery protection for VBUS, DP_IN and DM_IN.
1.1 Features
The EVM supports the following features:
• TPS254900A-Q1 built-in IEC 61000-4-2 ESD protection on DP_IN and DM_IN pins
• Linear USB cable voltage droop compensation
• The TPS254900A-Q1 is fully AEC Q100 qualified
• Built-in short to battery protection and notification on VBUS, DP_IN and DM_IN
• LMR14030SDDAR high-performance 2.2-MHz automotive-qualified DC/DC converter
1.2 Applications
The EVM can be used in the following applications:
• Automotive infotainment system
• Automotive USB charging box
2 Description
The TPS254900AQ1EVM-003 enables full evaluation of the TPS254900A-Q1 device. Refer to the
schematic in Figure 1. An automotive voltage range input is applied at the J1 connector. The input voltage
is regulated by the LMR14030SDDAR buck regulator (U1) and associated circuitry. This provides a
nominal 5-V, 3-A output at +5 VDC for the TPS254900A-Q1 (U2).
The TPS254900A-Q1 internal power switch connects +5 VDC furnished by the LMR14030SDDAR regulator
to VBUS at the downstream facing USB connector, J5. When the internal power switch is ON, the D6 LED
(green) illuminates. USB 2.0 data can be passed through the TPS254900AQ1EVM-003 from J5 to J4
when the TPS254900A-Q1 is configured for either SDP or CDP mode using the J6 header. The
TPS254900A-Q1 status and fault conditions can be detected using the D3 (blue) and D2 (red) LEDs,
respectively.
The TPS254900A-Q1 provides system-level ESD protection in accordance with IEC 61000-4-2 up to ±8-
kV contact and ±15-kV air discharge at the DP_IN and DM_IN signals going to J5. These pins as well as
VBUS pin will also provide detection of shorts to the battery by triggering the FAULT logic and illuminating
D2.
The TPS254900A-Q1 provides USB cable voltage droop compensation at the load through the use of the
CS pin. Sinking current into the CS pin mirrors the current through the TPS254900A-Q1 power switch at a
rate of 82 µA/A. The CS pin current is summed with the LMR14030SDDAR regulator feedback current
through R1 causing the voltage at +5 VDC to change with USB downstream load current. The +5 VDC
increases linearly as load current increases. This compensation will keep the load end voltage close to 5
VDC. The default compensation resistor values (R1 and R4) target a USB cable resistance of 200 mΩ.
Refer to the TPS254900A-Q1 data sheet for more information.
The TPS254900A-Q1 provides a current detection function through the use of the IMON pin. Connect a
resistor between IMON and GND. The system can detect the load current in real time by monitoring the
IMON voltage.

GND
GND
GND
GND
GND D1
GND GND GND
VBAT
GND
TP2
J2
GND
TP1
10µH
L1
VBUS 1
D- 2
D+ 3
GND 4
5
6
J4
VBUS
1
D-
2
D+
3
GND
4
5
6
J5
5V @ 2.4A
GND
1 2
3 4
5 6
7 8
J6
10uF
16V
C8
TP7 TP8
10µF
16V
C15
J3
Red
D2
Blue
D3
Green
D6
18V
D5
DM_OUT
DP_OUT
5VDC
CS
5VDC
0.022µF
16V
C6
0.1µF
16V
C13
0.1µF
50V
C16
19.1k
R16
80.6k
R17
63.4k
R3
0.022µF
16V
C7
0.1µF
50V
C3
2.55k
R18
29.4k
R4
1.0k
R6
1.0k
R7
3.0k
R12
18V
D4
5.1k
R10
47µF
16V
C4
47µF
16V
C5
10µF
50V
C2
J1
CS TP3 TP4
GND
0.1µF
16V
C1
100kR11
100kR14
100kR15
100kR19
10µF
C11 47µF
35V
C9
DNP
DP_IN
DM_IN
DM_IN
DP_IN
2.2µF
C10
TP11 TP10
TP9
12V @ 1A
GND
BOOT 1 VIN
2
EN
3
RT/SYNC
4
FB 5
SS
6GND 7
SW 8
PAD 9
U1
LMR14030SDDAR
IMON 1
IN
3
DM_OUT
4
DP_OUT
5
CS
6
EN
7
CTL1
8
CTL2
9
OVP_SEL
10 GND 11
DP_IN 13
DM_IN 14
OUT 15
STATUS
17 FAULT
18
IN
2
OUT 16
ILIM_LO 19
ILIM_HI 20
BIAS 12
PAD 21
U2
TPS254900IRVCRQ1
0
R2
15k
R9
15k
R8
2.67k
R1
5.62k
R5
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www.ti.com Schematic
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3 Schematic
Figure 1 illustrates the EVM schematic.
Figure 1. TPS254900AQ1EVM-003 Schematic

General Configuration and Description www.ti.com
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4 General Configuration and Description
4.1 Physical Access
Table 1 lists the TPS254900AQ1EVM-003 connector functionality, Table 2 describes the test point
availability and Table 3 describes the jumper functionality.
Table 1. Connector Functionality
Connector Label Description
J5 J5 Downstream facing USB 2.0 connector. Connect to the USB 2.0 slave for
data pass through from J4. USB output power is also provided to the slave.
J4 J4 Upstream facing USB 2.0 connector. Connect to the USB 2.0 host for data
pass through to J5. USB input power can also be provided by the host
when the J3 shunt is installed.
J1 J1 Automotive input voltage range connector. Connect to a 7 V–18 V, 1.5-A
voltage source according to the polarity marked on the EVM.
D2 (RED) D2 TPS254900A-Q1 FAULT output is triggered
D3 (BLUE) D3 TPS254900A-Q1 STATUS output is triggered
D6 (GREEN) D6 TPS254900A-Q1 output powered
Table 2. Test Points
Test Point Color Label Description
TP1 SM-L VDC TPS254900A-Q1 power switch input from DC-DC converter
TP2 SM-L CS Loop injection point
TP3 SM-L GND GND Test point
TP4 SM-L GND GND Test point
TP7 SM-L STATUS TPS254900A STATUS pin test point
TP8 SM-L FAULT TPS254900A FAULT pin test point
TP9 SM-L VIN TPS254900A VIN pin test point
TP10 SM-L OUT TPS254900A VBUS pin test point
TP11 SM-L IMON TPS254900A IMON pin test point
Table 3. Jumpers
Jumper Label Description
J2 J2 Install to power TPS254900A-Q1 with a DC/DC
J3 J3 USB host furnished input voltage. Install to power TPS254900A-Q1 with a USB
host.
J6 J6 TPS254900A-Q1 mode select jumper block. Install shunt at EN (1-2) to disable
TPS254900A-Q1. C1, C2, OVP_SEL positions select the charging mode for
TPS254900A-Q1. Refer to the data sheet for more information.

+
PSIL003
J4
J1
J5
7" Twisted Pair, #20AWG
TP4
VIN
Resistor Load
TP10
D6
D2
D3
+
±
±
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www.ti.com General Configuration and Description
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4.2 Test Setup
Figure 2 shows a typical test setup for TPS254900AQ1EVM-003. Connect J1 to the 14-V power supply.
The TPS254900A-Q1 output load can be applied either between TP10 and TP4 or via the USB 2.0 cable
plugged into J5.
Figure 2. Typical TPS254900AQ1EVM-003 Test Setup

EVM Assembly Drawings and Layout Guidelines www.ti.com
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5 EVM Assembly Drawings and Layout Guidelines
5.1 PCB Drawings
Figure 3 through Figure 8 show component placement and layout of the EVM.
Figure 3. Top Side Placement Figure 4. Top Side Routing
Figure 5. Layer Two Routing Figure 6. Layer Three Routing

www.ti.com EVM Assembly Drawings and Layout Guidelines
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Figure 7. Bottom Side Routing Figure 8. Bottom Side Placement

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5.2 Layout Guidelines
Use the following layout guidelines:
•TPS254900A-Q1 placement: Place the TPS254900A-Q1 near the USB output connector and OUT pin
filter capacitors. Connect the exposed pad to the GND pin and the system ground plane using an array
of vias.
• IN pin bypass capacitance: Place the 0.1-μF bypass capacitor near the IN pin and make the
connection using a low inductance trace.
•DP-OUT, DM-OUT and DP-IN, DM-IN traces: Route these traces as controlled impedance differential
pairs per the USB-2.0 specification. Minimize the use of vias in the high-speed data lines. Figure 7
provides a good signal routing example for the high-speed data traces. In this example, the data pairs
are routed as edge-coupled microstrips with nominal differential impedance of 90 Ω. The reference
plane is tied to GND and is shown in Figure 6. Ensure that the reference plane is void of cuts or splits
above the differential pairs to prevent impedance discontinuities.
•ILIM_LO and ILIM_HI pin connections: Current-limit, set-point accuracy can be compromised by
stray current leakage from a higher voltage source to the ILIM_LO or ILIM_HI pins. Ensure that there is
adequate spacing between IN pin copper/trace and ILIM_LO pin trace to prevent contaminant buildup
during the PCB assembly process.
• The capacitor on BIAS helps improve IEC ESD performance, a 2.2-µF capacitor should be placed
close to BIAS and the whole “current” path from BIAS to GND across this capacitor should be as short
as possible. Do not use a via along the connection traces.
• A 10-µF output capacitor should be placed close to the OUT pin and TVS.
5.3 EMI Containment
EMI containment methods are shown in the following list:
• Use compact loops for dv/dt and di/dt circuit paths (power loops and gate drives)
• Use minimal, yet thermally adequate, copper areas for heat sinking of components tied to switching
nodes (minimize exposed radiating surface).
• Use copper ground planes (possible stitching) and top-layer copper floods (surround circuitry with
ground floods)
• Use a 4-layer PCB, if economically feasible (for better grounding)
• Minimize the amount of copper area associated with input traces (to minimize radiated pickup)
• Maintain physical separation between input-related circuitry and power circuitry (use ferrite beads as
boundary line)
• Possible use of common-mode inductors

www.ti.com Bill of Materials
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6 Bill of Materials
Table 4 lists the EVM bill of materials.
(1) Unless otherwise noted in the Alternate Part Number or Alternate Manufacturer columns, all parts may be substituted with equivalents.
Table 4. TPS254900AQ1EVM-003 Bill of Materials(1)
Designator QTY Value Description Package Reference Part Number Manufacturer Alternate Part
Number Alternate Manufacturer
!PCB 1 Printed Circuit Board PSIL003 Any - -
C1, C13, C16 3 0.1uF CAP, CERM, 0.1 µF, 16 V, +/- 10%, X7R, 0603 0603 GRM188R71C104KA01D Murata
C2 1 10uF CAP, CERM, 10 µF, 50 V, +/- 10%, X5R, 1210 1210 C3225X5R1H106K250AB TDK
C3 1 0.1uF CAP, CERM, 0.1 µF, 50 V, +/- 10%, X7R, 0603 0603 GRM188R71H104KA93D Murata
C4, C5 2 47uF CAP, CERM, 47 µF, 16 V, +/- 20%, X5R, 1210 1210 GRM32ER61C476ME15L Murata
C6, C7 2 0.022uF CAP, CERM, 0.022 µF, 16 V, +/- 10%, X7R, 0603 0603 C0603C223K4RACTU Kemet
C8, C15 2 10uF CAP, CERM, 10 µF, 16 V, +/- 10%, X7R, 1206 1206 GRM31CR71C106KAC7L Murata
C10 1 2.2uF CAP, CERM, 2.2 µF, 50 V, +/- 10%, X5R, 0603 0603 GRM188R61H225KE11D Murata
C11 1 10uF CAP, CERM, 10 µF, 35 V, +/- 10%, X7R, 1210 1210 GRM32ER7YA106KA12L Murata
D1 1 50V Diode, Schottky, 50 V, 3 A, SMA SMA B350A-13-F Diodes Inc.
D2 1 Red LED, Red, SMD SMD, 2-Leads, Body
1.3x0.8mm LS L29K-G1J2-1-Z OSRAM
D3 1 Blue LED, Blue, SMD BLUE 0603 LED LB Q39G-L2N2-35-1 OSRAM
D4, D5 2 18V Diode, TVS, Uni, 18 V, 400 W, SMA SMA SMAJ18A Littelfuse
D6 1 Green LED, Green, SMD 0.8x1.6mm HSMG-C190 Avago
J1 1 Conn Term Block, 2POS, 3.5mm, TH 11x8.5x7.3mm 1751248 Phoenix Contact
J2, J3 2 Header, 100mil, 2x1, Tin, TH Header, 2 PIN, 100mil,
Tin PEC02SAAN Sullins Connector Solutions
J4 1 Connector, Plug, USB Type A, R/A, Top Mount SMT USB Type A right angle 48037-1000 Molex
J5 1 Connector, Receptacle, USB TYPE A, R/A, Top Mount
SMT USB TYPE A CONNECTOR
RECEPTACLE 4POS
SMD
896-43-004-00-000000 Mill-Max
J6 1 Header, 100mil, 4x2, Tin, TH Header, 4x2, 100mil, Tin PEC04DAAN Sullins Connector
Solutions
L1 1 10uH Inductor, Shielded Drum Core, Powdered Iron, 10 µH, 3 A,
0.075 ohm, SMD Inductor, 6.6x3x6.6mm 74437346100 Wurth Elektronik eiSos
R1 1 2.67k RES, 2.67 k, 1%, 0.1 W, 0603 0603 CRCW06032K67FKEA Vishay-Dale
R2 1 0 RES, 0, 5%, 0.1 W, 0603 0603 CRCW06030000Z0EA Vishay-Dale
R3 1 63.4k RES, 63.4 k, 1%, 0.1 W, 0603 0603 RC0603FR-0763K4L Yageo America
R4 1 29.4k RES, 29.4 k, 1%, 0.1 W, 0603 0603 CRCW060329K4FKEA Vishay-Dale
R5 1 5.62k RES, 5.62 k, 1%, 0.1 W, 0603 0603 CRCW06035K62FKEA Vishay-Dale
R6, R7 2 1.0k RES, 1.0 k, 5%, 0.1 W, 0603 0603 CRCW06031K00JNEA Vishay-Dale
R8, R9 2 15k RES, 15 k, 5%, 0.1 W, 0603 0603 CRCW060315K0JNEA Vishay-Dale
R10 1 5.1k RES, 5.1 k, 5%, 0.1 W, 0603 0603 CRCW06035K10JNEA Vishay-Dale
R11, R14, R15, R19 4 100k RES, 100 k, 1%, 0.1 W, 0603 0603 RC0603FR-07100KL Yageo America
R12 1 3.0k RES, 3.0 k, 5%, 0.1 W, 0603 0603 CRCW06033K00JNEA Vishay-Dale
R16 1 19.1k RES, 19.1 k, 1%, 0.1 W, 0603 0603 CRCW060319K1FKEA Vishay-Dale

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Table 4. TPS254900AQ1EVM-003 Bill of Materials(1) (continued)
Designator QTY Value Description Package Reference Part Number Manufacturer Alternate Part
Number Alternate Manufacturer
R17 1 80.6k RES, 80.6 k, 1%, 0.1 W, 0603 0603 CRCW060380K6FKEA Vishay-Dale
R18 1 2.55k RES, 2.55 k, 1%, 0.1 W, 0603 0603 CRCW06032K55FKEA Vishay-Dale
SH-J2, SH-J3 2 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M SNT-100-BK-G Samtec
TP1, TP2, TP3, TP4, TP7, TP8,
TP9, TP10, TP11 9 SMT Test Point, Miniature, SMT Testpoint_Keystone_Mini ature 5015 Keystone
U1 1 SIMPLE SWITCHER 40 V 3.5 A, 2.2 MHz Step-Down
Converter with 40 uA IQ, DDA0008E DDA0008E LMR14030SDDAR Texas Instruments LMR14030SDDA Texas Instruments
U2 1 Automotive USB Charging Port Controller and Power
Switch with Short to BAT protection, RVC0020A RVC0020A TPS254900IRVCRQ1 Texas Instruments TPS254900IRVCTQ1 Texas Instruments
C9 0 47uF CAP, AL, 47 µF, 35 V, +/- 20%, 0.44 ohm, SMD 6.3x5.8 UUD1V470MCL1GS Nichicon
FID1, FID2, FID3, FID4, FID5,
FID6 0 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A