1 Introduction
1.1 Related Documentation from Texas Instruments
User's GuideSLUU339 – December 2008
TPS2552/3, Power-Distribution SwitchWith Adjustable Current-Limit EVM
This user’s guide describes the TPS2552/3DBVEVM and TPS2552/3DRVEVM evaluation modules (EVM).This guide contains the EVM schematic, bill of materials, assembly drawing, and top and bottom boardlayouts.
The TPS2552/3DBVEVM and TPS2552/3DRVEVM are evaluation modules (EVM) for Texas Instruments’family of power-distribution switches with adjustable current-limit. These EVMs operate over a 2.5-V to6.5-V range. An onboard jumper sets the output current-limit to either 0.5 A or 1 A. Test points provideconvenient access to all critical node voltages.
The silkscreen outline on the PCB top-side encloses components found in a typical USB application.
The PCB top-side accepts a power-distribution switch in a SOT23-6 package; the PCB bottom sideaccepts a power-distribution switch in the smaller SON package with a thermal pad. These switches havean enable input, an overcurrent status output, and overtemperature shutdown.
TPS2552, TPS2553 data sheet (TI Literature Number SLVS841)
SLUU339 – December 2008 TPS2552/3, Power-Distribution Switch 1With Adjustable Current-Limit EVMSubmit Documentation Feedback
2 Electrical Specifications
2.1 Electrostatic Discharge
3 Schematic
3.1 EVM Options
Electrical Specifications
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The EVM meets the electrical specifications in Table 1 over the recommended operatingjunction-temperature range of -40 °C≤T
J
≤105 °C for the DRV (SON) package and -40 °C≤T
J
≤125 °C forthe DBV (SOT23-6) package.
Table 1. EVM Electrical Specifications
MAPARAMETER CONDITION MIN TYP UNITX
Input voltage, V
IN
J1 2.5 – 6.5 VShort-circuit output J2 shorting-jumper is absent, J3 is short 0.28 0.47 0.61 Acurrent-limit, I
LIMIT
circuited, TPS2552/3 is enabledJ2 shorting-jumper is present, J3 is short 0.70 1.02 1.24circuited, TPS2552/3 is enabled
The EVM has been tested to IEC 61000-4-2. The level used was 8-kV contact discharge and 15-kV airdischarge. Surges were applied to the EVM input and output. No damage to the TPS2552/3 wasobserved.
Table 2. EVM Options
HPA364 DEVICE DEVICE PACKAGE ENABLE
-1 TPS2552DBV SOT-23-6 Active Low-2 TPS2553DBV SOT-23-6 Active High-3 TPS2552DBV-1 SOT-23-6 Active Low-4 TPS2553DBV-1 SOT-23-6 Active High-5 TPS2552DRV SON Active Low-6 TPS2553DRV SON Active High-7 TPS2552DRV-1 SON Active Low-8 TPS2553DRV-1 SON Active High
TPS2552/3, Power-Distribution Switch2 SLUU339 – December 2008With Adjustable Current-Limit EVM
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4 EVM Setup
4.1 Recommended Test Equipment
4.2 Measuring the Short-Circuit Output Current-Limit
5V, 5A
0-W
+
IN
-
+
OUT
-
EVM
Oscilloscope
Current
Probe
FAULT
VoltageProbe
7" TwistedPair,#20AWG
EVM Setup
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The following test equipment is recommended:•Two-channel storage oscilloscope•Current probe•Voltage probe•An adjustable power supply with a 2.5-V to 6.5-V output and a 10-A output current-limit•Volt-ohm meter•A passive or active load capable of handling 3 A.
The user should read the TPS2552/3 data sheet before using the EVM.
Figure 2 shows the EVM test setup for measuring current-limit. Switch S1 enables the power-distributionswitch into a short circuit for this measurement. For retry controllers, Figure 3 shows the current waveformfor the TPS2552/3DRVEVM with a shorting jumper populating header J2; Figure 4 shows the currentwaveform with header J2 unpopulated.
For latch-off controllers Fig5 shows the current waveform for the TPS2552/3DRV EVM with a shortingjumper populating header J2; Figure 6 shows the current waveform with header J2 unpopulated.
Figure 2. EVM Setup For Measuring Current-Limit
4TPS2552/3, Power-Distribution Switch SLUU339 – December 2008With Adjustable Current-Limit EVM
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4.3 Adjusting the Short-Circuit Output Current-Limit
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EVM Setup
Figure 3. TPS2552DRVEVM Short-Circuit Figure 4. TPS2552DRVEVM Short-CircuitOutput Current and Output Current andFAULT Status With J2 Shorting Jumper FAULT Status With J2 Shorting JumperPresent. Absent.
Figure 5. PS2552DBVEVM Short-Circuit Figure 6. TPS2552DBVEVM Short-CircuitOutput Current and Output Current andFAULT Status With J2 Shorting Jumper FAULT Status With J2 Shorting JumperPresent. Absent.
The EVM provides two current-limit settings. If a different setting is required, then populate header J2 witha shorting jumper and modify resistor R3 using the current limit resistor calculator, TI Literature NumberSLVC163 .
See the TPS2552/3 data sheet for the worst-case current-limit variation.
SLUU339 – December 2008 TPS2552/3, Power-Distribution Switch 5With Adjustable Current-Limit EVMSubmit Documentation Feedback
6 List of Materials
List of Materials
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Table 3. EVM List of Materials
(1) (2) (3) (4) (5) (6)
QTY
PARTREF DES DESCRIPTION MFRNUMBER-001 -002 -003 -004 -005 -006 -007 -008
Capacitor, ceramic, 10 µF, X7R, 101 1 1 1 1 1 1 1 C1 STD STDV, 10%, 1206Capacitor, ceramic, 16 V, X7R,2 2 2 2 2 2 2 2 C2, C3 STD STD10%, 0.1 µF, 0805Capacitor, tantalum, 150 µF, 10 V, B45197A2151 1 1 1 1 1 1 1 C4 KEMET100 m Ω, 10%, 7343 (D) 7K409Header, male 2 pin, 100-mil1 1 1 1 1 1 1 1 J2 spacing, (36-pin strip), 0.100 inch x PTC36SAAN Sullins2
Power-distribution switch, current1 0 0 0 0 0 0 0 U1 TPS2552DBV TIlimited, SOT-23-6
Power-distribution switch, current0 1 0 0 0 0 0 0 U1 TPS2553DBVlimited, SOT-23-6
Power-distribution switch, current TPS2552DBV0 0 1 0 0 0 0 0 U1
limited, SOT-23-6 -1Power-distribution switch, current TPS2553DBV0 0 0 1 0 0 0 0 U1
limited, SOT-23-6 -1Power-distribution switch, current TPS2552DR0 0 0 0 1 0 0 0 U2 TIlimited, SON VPower-distribution switch, current TPS2553DR0 0 0 0 0 1 0 0 U2
limited, SON VPower-distribution switch, current TPS2552DR0 0 0 0 0 0 1 0 U2
limited, SON V-1Power-distribution switch, TPS2553DR0 0 0 0 0 0 0 1 U2
current-limited, SON V-1PCB, 2.25 In x 2.225 In x 0.062 In,1 1 1 1 1 1 1 1 -- HPA364 AnySON
Resistor, chip, 1/10 W, 1%, 10.0 CRCW0805-2 2 2 2 2 2 2 2 R1, R2 VishaykΩ, 0805 1002FResistor, chip, 1/10 W, 1%, 20.0 CRCW0805-2 2 2 2 2 2 2 2 R3, R4 VishaykΩ, 0805 2002-FSwitch, SPDT, slide, PC mount,1 1 1 1 1 1 1 1 S1 09-03201-02 EAO500 mA, 0.400 x 0.100 inTerminal block, 2 pin, 6 A, 3.5 mm,2 2 2 2 2 2 2 2 J1, J3 ED555/2DS OST0.27 x 0.25 inchTP1, TP2,
Test point, white, thru-hole color5 5 5 5 5 5 5 5 TP3, TP4, 5002 Keystonekeyed, 0.100 x 0.100 inTP5
TP6, TP7, Test point, SM, 0.150 x 0.090,4 4 4 4 4 4 4 4 5016 KeystoneTP8, TP9 0.185 x 0.135 in(1)
These assemblies are ESD sensitive, ESD precautions shall be observed.(2)
These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.(3)
These assemblies must comply with workmanship standards IPC-A-610 Class 2.(4)
Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent MFG'scomponents.
(5)
Attach a rubber bumper to each corner of the PCB.(6)
Insert shorting jumper on header J2.
10 TPS2552/3, Power-Distribution Switch SLUU339 – December 2008With Adjustable Current-Limit EVM
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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 PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.5 V to 5.5 V and the output voltage range of 2.5 V to 5.5 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning 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 85 °C. The EVM is designed to operateproperly with certain components above 85 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing 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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