Texas Instruments TPS254900AQ1EVM-003 User Manual
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
1 Connector Functionality..................................................................................................... 4
2 Test Points.................................................................................................................... 4
3 Jumpers....................................................................................................................... 4
4 TPS254900AQ1EVM-003 Bill of Materials ............................................................................... 9
Trademarks
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List of Tables
TPS254900AQ1EVM-003 Evaluation Module
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1
Introduction
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
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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 VDCfor the TPS254900A-Q1 (U2).
The TPS254900A-Q1 internal power switch connects +5 VDCfurnished 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 ±8kV 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 VDCto change with USB downstream load current. The +5 V
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.
DC
2
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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
63.4kR30.022µF
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
6
GND
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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3 Schematic
Figure 1 illustrates the EVM schematic.
Schematic
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Figure 1. TPS254900AQ1EVM-003 Schematic
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General Configuration and Description
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
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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
J6 J6 TPS254900A-Q1 mode select jumper block. Install shunt at EN (1-2) to disable
4
TPS254900AQ1EVM-003 Evaluation Module
host.
TPS254900A-Q1. C1, C2, OVP_SEL positions select the charging mode for
TPS254900A-Q1. Refer to the data sheet for more information.
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+
PSIL003
J4
J1
J5
7" Twisted Pair, #20AWG
TP4
V
IN
Resistor Load
TP10
D6
D2
D3
+
±
±
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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.
General Configuration and Description
Figure 2. Typical TPS254900AQ1EVM-003 Test Setup
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TPS254900AQ1EVM-003 Evaluation Module
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