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NEVB-NPS4069 / NEVB-NPS4001
load switch evaluation board

Abstract:

The NEVB-NPS4069 and NEVB-NPS4001 are two-layer PCBs containing either the NPS4069 or theNPS4001 load switch device. The VIN and VOUT connections to the device and the PCB layout routing
are capable of handling high continuous currents and provide a low-resistance pathway into and out ofthe device under test. Test point connections allow the EVB user to control the device with user-definedtest conditions and make accurate RON measurements.

Keywords:

Load switch, evaluation board (EVB)

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NEVB-NPS4069 / NEVB-NPS4001 load switch evaluation board

1. Introduction
The NEVB-NPS4069 and NEVB-NPS4001 evaluation boards are dedicated PCBs featuring either
the Nexperia load switch IC NPS4069 or the NPS4001. The boards feature a 2-layer PCB with asubstantial ground layer. The PCB layout routing is capable of handling high continuous currents
and provides a low-resistance pathway into and out of the device under test. The test points aredesigned as separate voltage sensing connections on the PCB for accurate voltage and RON
measurements where the test results are not influenced by voltage drops created by the loadcurrent.
Input and output connections are provided with convenient test-point connection pins as well as
robust solder pins. There are several connection terminals for GND and test points at the input andoutput of the load switch to allow a simple and very convenient connection of scope probes.

Fig. 1.

NEVB-NPS4069 / NEVB-NPS4001 evaluation board for load switch IC NPS4069 orNPS4001

1.1. NEVB-NPS4069 key parameters
•
••
•
•

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EVB name = NEVB-NPS4069
Device = NPS4069
EVB input voltage range (VIN): 2.5 V to 5.5 V
EVB maximum continuous current = 1.5 A RMS continuous (NPS4069)
EVB features:• Soft start• Over temperature protection• Quick output discharge• Active reverse voltage detection

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NEVB-NPS4069 / NEVB-NPS4001 load switch evaluation board

1.2. NEVB-NPS4001 key parameters•••••

EVB name = NEVB-NPS4001
Device = NPS4001
EVB input voltage range (VIN): 2.5 V to 5.5 V
EVB maximum continuous current = 2 A RMS continuous (NPS4001)
EVB features:• Soft start• Over temperature protection• Quick output discharge• Active reverse voltage detection

1.3. Features
•••
•
••

Input voltage can be supplied via the test points J1 (VIN), VIN can range from 2.5 V to 5.5 V.
A test load can be connected to terminal TP5 (VOUT_sense) and any of the GND test points.
Alternatively, there are GND test points at TP4, TP6, TP7, TP8, TP9, TP10, and TP11.
Decoupling capacitors are connected to VIN at the input of the EVB and close to the load switch
IC. The same holds for the output.
The enable pin (ON) has a smart pull-down resistor built in which disables the load switch if theenable pin is not terminated. For an activated load switch, the pull-down resistor is decoupled.
This avoids current flowing through a pull-down that is not needed for the high state of thecontrol input.
VIN_sense and VOUT_sense are used when accurate measurements of the input or output
are required. Make RON measurements using these sense connections when measuring thevoltage drop from VIN to VOUT.

2. SchematicFig. 2 shows the schematic diagram of the NEVB-NPS4069 evaluation board. The components,solder pins, connectors and test points described in the feature list above can be found here.

Fig. 2.

NEVB-NPS4069 / NEVB-NPS4001 schematic diagram

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3. PCB layout
Fig. 3 shows the PCB layout of the NEVB-NPS4069 / NEVB-NPS4001. The PCB has two copper
layers, the top copper layer is shown in a), the bottom layer is shown in b). Fig. 4 shows the PCBsilkscreen.

a) top copper layerb) bottom copper layer
Fig. 3.

NEVB-NPS4069 / NEVB-NPS4001 PCB layout

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Fig. 4.

NEVB-NPS4069 / NEVB-NPS4001 PCB silkscreen

4. Bill of Materials (BOM)
Table 1. NPS4069EVB / NEVB-NPS4001 Bill of Materials
Reference Quantity Descriptiondesignator

MFG

MFG P/N-1Printed Circuit Board

C1110uF+/-10% 16V X6S 2 0805

Samsung

CL21X106KOQNNNE

C2, C320.1 µF ±10% 10V Ceramic Capacitor 0805
(2012 Metric)

Taiyo Yuden

LM212SD104KG-T

J1, J22TERM BLK 2POS SIDE ENTRY 5MM PCB Phoenix Contact

1715022

R1, R22RES 10K OHM 1% 1/8W 0805

Stackpole

RNCS0805BKE10K0

S11CONN HEADER VERT 3POS 2.54MM

TE connectivity

5-14278-3

TP1 - TP11 11

PC TEST POINT MINIATURE

Keystone

5019

U1NPS4069 / NPS4001

Nexperia

NPS4069 / NPS4001

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PCB

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5. Set up and operation
The NEVB-NPS4069 / NEVB-NPS4001 board is easy to set up and operate. This chapters gives
some instructions for proper use.

5.1. Input supply
The input voltage source VIN is connected to the points J1(IN), VIN. This is where the positive leadis connected. The points J1(GND), J2 (GND), TP4, TP6, TP7, TP8, TP9, TP10, and TP11. are theground connections.
For experiments with higher current, the cables from the power supply to the EVB should be
adequate regarding resistance in order to avoid higher voltage losses from the power supply to theload switch board

5.2. Load switch output
Loads at the output can be connected via the test points labeled OUT. The direct groundconnections are appropriately labeled across the EVB.

5.3. Enable control
Connector S1 connects the enable input (ON) of the load switch IC to either VIN or GND, hence
turning the load switch IC on or off. External control signals can be applied via S1 pin 2 from anexternal function generator for example see Fig. 5.
The limits from the data sheet must be obeyed for the voltage applied at the enable pin.
Furthermore, make sure S1 pin 2 isn’t jumpered to pins 1 or 3.
aaa-039044

NPS4069 / NPS4001

OUTIN
3

Function
Generator

2

R110k/FLTONGND

1S1Fig. 5.

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NEVB-NPS4069 / NEVB-NPS4001 enable options

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5.4. Voltage sense test points
The NEVB-NPS4069EVB / NEVB-NPS4001 includes test points for VIN and VOUT, these arelabelled VIN_SENSE andVOUT_SENSE. These test pins allow for precise measurement of theinput and output voltages at the package pins of the load switch IC. At these test points there isno influence from voltage losseson the PCB due by to on-board wiring. Ron can be evaluated withexact results at these test points as:
R ON =( VIN_Sense - VOUT_Sense((1)

I OUT

5.5. Start-up operation
To start operating the NEVB-NPS4069 / NEVB-NPS4001, connect a power supply with 2.5 V to 5.5
V to VIN. The loadswitch needs to be enabled by applying a jumper to S1 pins 3 and 2 or applying
a high-level input signal to the enable pin as described in Section 5.3. With a load connected to theVOUT terminals, a maximum continuous output current of 1.5 A (NPS4069) and 2 A (NPS4001)
can be supported.

6. Test configurations
6.1. Dynamic parameter testing
Dynamic parameters like the smooth turn-on of the NPS4069 and NPS4001 can be measured at
VOUT_SENSE. with an oscilloscope. At S1 pin 2 the enable signal can be accessed and used astrigger signal.
Fig. 6 shows the oscilloscope connection points for measurement of VOUT and triggering from theenable input VIN. With the same set-up the fall time of VOUT can be tested. Experiments with theQOD feature can be performed.

DC Power
Supply #1

E-LoadFunconGenerator
aaa-039104

Fig. 6.

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Measurement set-up for dynamic parameters e.g. VOUT rise and fall times

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NEVB-NPS4069 / NEVB-NPS4001 load switch evaluation board7. Revision history
Table 2. Revision history
Revision
DatenumberDescription

1.0

Initial version.

2024-02-19

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8. Legal information
Definitions
Draft — The document is a draft version only. The content is still underinternal review and subject to formal approval, which may result inmodifications or additions. Nexperia does not give any representations orwarranties as to the accuracy or completeness of information included hereinand shall have no liability for the consequences of use of such information.

Disclaimers
Limited warranty and liability — Information in this document is believed
to be accurate and reliable. However, Nexperia does not give anyrepresentations or warranties, expressed or implied, as to the accuracy
or completeness of such information and shall have no liability for theconsequences of use of such information. Nexperia takes no responsibility
for the content in this document if provided by an information source outsideof Nexperia.
In no event shall Nexperia be liable for any indirect, incidental, punitive,special or consequential damages (including - without limitation - lostprofits, lost savings, business interruption, costs related to the removalor replacement of any products or rework charges) whether or not suchdamages are based on tort (including negligence), warranty, breach ofcontract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, Nexperia’s aggregate and cumulative liability towards customer
for the products described herein shall be limited in accordance with theTerms and conditions of commercial sale of Nexperia.
Right to make changes — Nexperia reserves the right to make changes
to information published in this document, including without limitation
specifications and product descriptions, at any time and without notice. This
document supersedes and replaces all information supplied prior to thepublication hereof.
Suitability for use — Nexperia products are not designed, authorized orwarranted to be suitable for use in life support, life-critical or safety-criticalsystems or equipment, nor in applications where failure or malfunctionof an Nexperia product can reasonably be expected to result in personal
injury, death or severe property or environmental damage. Nexperia and its
suppliers accept no liability for inclusion and/or use of Nexperia products insuch equipment or applications and therefore such inclusion and/or use is at
the customer’s own risk.
Applications — Applications that are described herein for any of theseproducts are for illustrative purposes only. Nexperia makes no representation
or warranty that such applications will be suitable for the specified use
without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using Nexperia products, and Nexperia accepts no liability forany assistance with applications or customer product design. It is customer’ssole responsibility to determine whether the Nexperia product is suitableand fit for the customer’s applications and products planned, as well as
for the planned application and use of customer’s third party customer(s).
Customers should provide appropriate design and operating safeguards tominimize the risks associated with their applications and products.
Nexperia does not accept any liability related to any default, damage, costs
or problem which is based on any weakness or default in the customer’s
applications or products, or the application or use by customer’s third party
customer(s). Customer is responsible for doing all necessary testing for thecustomer’s applications and products using Nexperia products in order toavoid a default of the applications and the products or of the application or
use by customer’s third party customer(s). Nexperia does not accept any
liability in this respect.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a priorauthorization from competent authorities.
Translations — A non-English (translated) version of a document is forreference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.

Trademarks
Notice: All referenced brands, product names, service names andtrademarks are the property of their respective owners.

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List of Tables
Table 1. NPS4069EVB / NEVB-NPS4001 Bill of Materials.. 5
Table 2. Revision history......................................................8

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List of Figures
Fig. 1. NEVB-NPS4069 / NEVB-NPS4001 evaluation
board for load switch IC NPS4069 or NPS4001.................. 2
Fig. 2. NEVB-NPS4069 / NEVB-NPS4001 schematic
diagram.................................................................................3Fig. 3. NEVB-NPS4069 / NEVB-NPS4001 PCB layout........4Fig. 4. NEVB-NPS4069 / NEVB-NPS4001 PCB silkscreen. 5Fig. 5. NEVB-NPS4069 / NEVB-NPS4001 enable options.. 6Fig. 6. Measurement set-up for dynamic parameters
e.g. VOUT rise and fall times.............................................. 7

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Contents
1. Introduction................................................................... 2
1.1. NEVB-NPS4069 key parameters.................................2
1.2. NEVB-NPS4001 key parameters.................................3
1.3. Features.......................................................................3
2. Schematic......................................................................33. PCB layout.................................................................... 4
4. Bill of Materials (BOM)................................................. 5
5. Set up and operation................................................... 6
5.1. Input supply................................................................. 6
5.2. Load switch output...................................................... 6
5.3. Enable control..............................................................65.4. Voltage sense test points............................................ 7
5.5. Start-up operation........................................................ 7
6. Test configurations.......................................................76.1. Dynamic parameter testing..........................................7
7. Revision history............................................................88. Legal information......................................................... 9© Nexperia B.V. 2024. All rights reserved

For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release: 19 February 2024

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