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TPS254900A-Q1 Datasheet(PDF) 23 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) 23 Page - Texas Instruments

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Adjusting Resistor (kW)
10
20
30
40
50
60
70
80
90
100
0
500
1000
1500
2000
2500
3000
3500
4000
D022
IOS, Min
IOS, Max
IOS, Typ
Adjusting Resistor (kW)
100
200
300
400
500
600
700
800
900
1000
0
100
200
300
400
500
600
D023
IOS, Min
IOS, Max
IOS, Typ
23
TPS254900A-Q1
www.ti.com
SLUSCU5A – NOVEMBER 2017 – REVISED JANUARY 2018
Product Folder Links: TPS254900A-Q1
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
(1)
No 5.1-kΩ resistor from BIAS to OUT (open between the pins), or OUT still has 5-V voltage from an external downstream port; client
mode is still active.
(2)
No OUT discharge when changing from 10 to 11 or from 11 to 10.
(3)
A fault only trips OTSD, OUT, DP_IN, DM_IN, and OVP.
Figure 40. Current-Limit Setting vs Adjusting Resistor I
Figure 41. Current-Limit Setting vs Adjusting Resistor II
The routing of the traces to the R(ILIM_xx) resistors should have a sufficiently low resistance so as not to affect the
current-limit accuracy. The ground connection for the R(ILIM_xx) resistors is also very important. The resistors must
reference back to the TPS254900A-Q1 GND pin. Follow normal board layout practices to ensure that current
flow from other parts of the board does not impact the ground potential between the resistors and the
TPS254900A-Q1 GND pin.
8.4 Device Functional Modes
8.4.1 Device Truth Table (TT)
The device truth table (Table 3) lists all valid combinations for both control pins (CTL1 and CTL2), and the
corresponding charging mode. The TPS254900A-Q1 device monitors the CTL inputs and transitions to the
charging mode to which it is commanded.
Table 3. Truth Table
CTL1
CTL2
CURRENT LIMIT
SELECTED
MODE
STATUS
FOR LOAD
DETECT
CS FOR CABLE
COMPENSATION
IMON FOR
CURRENT
MONITOR
FAULT
REPORT
NOTES
0
0
N/A
Client
mode(1)
OFF
OFF
OFF
OFF
Power switch
is disabled,
only analog
switch is on.
0
1
ILIM_LO
SDP
OFF
ON
ON
ON
Standard
SDP
1
0
ILIM_LO
SDP1(2)
OFF
ON
ON
ON(3)
No OUT
discharge
between CDP
and SDP1 for
PPM
1
1
ILIM_HI
CDP(2)
ON
ON
ON
ON
8.4.2 USB BC1.2 Specification Overview
The BC1.2 specification includes three different port types:
Standard downstream port (SDP)
Charging downstream port (CDP)
Dedicated charging port (DCP)


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