User's Guide
SLVU501A – August 2011 – Revised January 2012
TPS2291xxEVM-656
This user's guide describes the characteristics, operation, and use of the TPS2291xxEVM-656 evaluation
module (EVM). This EVM demonstrates the Texas Instruments TPS2291xx load switch with controlled
turn on. The device contains a P-channel MOSFET that can operate over an input voltage of 1.4V to 5.5V.
The switch is controlled by an on/off input (ON), which is capable of interfacing directly with low-voltage
control signals. This user's guide includes setup instructions, schematic diagram, bill of materials, and
printed-circuit board layout drawings for the EVM.
1
Introduction
The TPS2291xxEVM-656 evaluation module (EVM) helps designers evaluate the operation and
performance of the TPS2291xx load switches. The board features the small 4-pin CSP package for a
small solution size.
Table 1. TPS22910, TPS22912, TPS22913 Vout Rise Time, Enable, and Discharge
Options
EVM
1.1
Device
Rise Time (µS)
Typ.
VIN(V)
Enable
(ON Pin)
Quick Output
Discharge
No
HPA656-001
TPS22910A
0.5
5
Active Low
HPA656-0011
TPS22912C
1000
5
Active High
No
HPA656-0014
TPS22913B
100
5
Active High
Yes
HPA656-0015
TPS22913C
1000
5
Active High
Yes
Related Documentation From Texas Instruments
TPS2291xx, ULTRA-SMALL, LOW rON LOAD SWITCH data sheet
SLVU501A – August 2011 – Revised January 2012
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TPS2291xxEVM-656
1
Setup
2
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Setup
This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
up, and use the TPS2291xxEVM-656.
2.1
J1/J3 – Input Connections
This is the connection for the leads from the input source. Connect the positive connection to the VIN J1
and the negative connection to the GND J3.
2.2
J4/J6 – Output Connections
This is the connection for the output of the TPS2291xxEVM. Connect the positive connection of the load to
the VOUT J4 and the negative connection to the GND J6.
2.3
JP3 – ON
This is the enable input for the device. A shorting jumper must be installed on JP3 in either the HI or LO
positions. The TPS2291xx family contains products that are active high and active low (refer to Table 1).
ON must not be left unconnected. An external enable source can be applied to the EVM by removing the
shunt and connecting a signal to the center pin of JP3. Refer to the Datasheet for proper ON and OFF
voltage level settings. A switching signal may also be used and connected at this point.
2.4
J2/J5 – VIN Sense and VOUT Sense
These two connectors are used when very accurate measurements of input or output voltage are required.
Ron measurements should be made using these sense connections and measuring the voltage drop from
VIN to VOUT and then calculating the resistance.
2.5
JP1/JP2 – Input Capacitors
During normal operation a shorting jumper is placed on JP2 and connects C2 capacitor from the input of
the device to ground. JP1 and C1 may be used to connect a user selected capacitor value from the input
of the device to ground. Refer to the Applications Section of the Datasheet for additional information on
selecting the input capacitors.
2.6
JP4/JP5 – Output Capacitors
During normal operation a shorting jumper is placed on JP4 and connects C3 capacitor from the output of
the device to ground. JP5 and C4 may be used to connect a user selected capacitor value from the output
of the device to ground. Refer to the Applications Section of the Datasheet for additional information on
selecting the output capacitors.
2.7
JP6/JP7/JP8 – Output Resistors
During normal operation no shorting jumpers are placed on JP6, JP7, or JP8. A shorting jumper may be
used on JP6 to connect R1 load resistor from the output of the device to ground. JP7 and JP8 may be
used to connect R2 and R3 user selected load resistors from the output of the device to ground. R1, R2,
and R3 are intended for light loads of the output; observe the 1/8W power rating for these parts.
NOTE: R2 is populated on some EVM’s with a 14Ω 1/8W resistor, the maximum power rating for this
part can be easily exceeded, observe the power rating for R2 if it is populated and used on
your EVM.
2
TPS2291xxEVM-656
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Operation
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3
Operation
Connect the positive input of the power supply to the VIN J1 and the negative lead of the power supply to
GND J3. The input voltage range of the TPS2291xx is 1.4 V to 5.5 V.
Output load can be applied by connecting between J4 VOUT and J6 GND. The TPS2291xx is rated for a
maximum continuous current of 2A. Configure jumper JP3 as required. JP3 must be installed for proper
operation. When the ON pin is asserted, the TPS2291xx will control the slew rate of VOUT. The slew rate
of the device is internally controlled to avoid inrush current. When ON is deasserted, the TPS2291xx will
open the P-Channel MOSFET. Devices equipped with the Quick Output Discharge (QOD) option will
connect a 150Ω on-chip load resistor to the output for quick discharge. Devices equipped with the QOD
function are noted in Table 1.
4
Test Results
See the Typical Characteristics section of the TPS2291xx data sheet.
SLVU501A – August 2011 – Revised January 2012
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TPS2291xxEVM-656
3
Board Layout, Schematic, and Bill of Materials
5
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Board Layout, Schematic, and Bill of Materials
This section provides the TPS2291xxEVM-656 board layout, schematic, and bill of materials.
5.1
Board Layout
For best performance, all traces should be as short as possible. To be most effective, the input and output
capacitors should be placed close to the device to minimize the effects that parasitic trace inductances
may have on normal and short-circuit operation. Using wide traces for VIN, VOUT, and GND helps minimize
the parasitic electrical effects along with minimizing the case to ambient thermal impedance Figure 1,
Figure 2, and Figure 3 show the board layout for the TPS2291xxEVM-656 PCB.
TEXAS
INSTRUMENTS
Figure 1. Top Assembly Layer
TEXAS
INSTRUMENTS
Figure 2. Top Layer
4
TPS2291xxEVM-656
SLVU501A – August 2011 – Revised January 2012
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Board Layout, Schematic, and Bill of Materials
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Figure 3. Bottom Layer
5.2
Schematic and Bill of Materials
Figure 4. TPS2291xxEVM-656 Schematic
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TPS2291xxEVM-656
5
Board Layout, Schematic, and Bill of Materials
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Table 2. Bill of Materials
Count
(1)
(2)
(3)
(4)
RefDes
Value
(1) (2) (3) (4)
Description
Size
Part Number
MFR
HPA656
Any
603
Std
Std
1 µF, use 10 µF Capacitor, Ceramic,6.3-V, X5R, 10%
for A type
devices
603
Std
Std
C1, C4
OPEN
Capacitor, Ceramic
603
Std
Std
R1
560 Ω
Resistor, 5% 1/8W
805
Std
Std
1
R2
OPEN
Resistor, 5% 1/8W
805
Std
Std
0
R3
OPEN
Resistor, 5% 1/8W
805
Std
Std
13
J1 – J6, JP1–2,
JP4–8
PEC02SAAN
Header,2pin, 100mil spacing
0.100 inch x 2
PEC02SAAN
Sullins
1
JP3
PEC03SAAN
Header,3pin, 100mil spacing IC,
0.100 inch x 3
PEC03SAAN
Sullins
1
U1
TPS2291xxYZP Single Chip, Low Input Voltage Current-Limited Load Switch
V
with Shut Off Auto-Restart
YZV
TPS2291xxYZV
TI
3
N/A
N/A
0.100
929950-00
3M
1
–
1
C3
0.1 µF
Capacitor, Ceramic,16-V, X7R, 10%
1
C2
0
1
PCB, 0.9 In x 1.7 In x 0.062 In
Shunt, 100-mil, Black
These assemblies are ESD sensitive, ESD precautions shall be observed.
These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
These assemblies must comply with workmanship standards IPC-A-610 Class 2.
Ref designators marked with an asterisk (**) cannot be substituted. All other components can be substituted with equivalent components.
Table 3.
6
TPS2291xxEVM-656
Assembly number
Text
HPA656-001
TPS22910AEVM-656
HPA656-011
TPS22912CEVM-656
HPA656-014
TPS22913BEVM-656
HPA656-015
TPS22913CEVM-656
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Board Layout, Schematic, and Bill of Materials
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5.3
VOUT Rise Time Examples
Figure 5. TPS22910A Trise Example
Figure 6. TPS22913B Trise Example
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7
Board Layout, Schematic, and Bill of Materials
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Figure 7. TPS22913C Trise Example
8
TPS2291xxEVM-656
SLVU501A – August 2011 – Revised January 2012
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Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
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including product safety and environmental measures typically found in end products that incorporate such semiconductor
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electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 1.4 V to 5.5 V and the output voltage range of unspecified.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 50°C. The EVM is designed to
operate properly with certain components above 60°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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