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NEVB-NPS1000 load switch evaluation boardAbstract:

The NEVB-NPS1000 is a two-layer PCB containing the NPS1000 load switch device. The VIN andVOUT connections to the device and the PCB layout routing provides a low-resistance pathway into andout of the device under test. Test point connections allow the EVB user to control the device with userdefined test conditions and make accurate RON measurements.

Keywords:

Load switch, evaluation board (EVB)

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NEVB-NPS1000 load switch evaluation board

1. Introduction
The NEVB-NPS1000 is a dedicated PCB featuring the Nexperia load switch IC NPS1000, seeFig. 1.
The board is a 2-layer PCB with a substantial ground layer. The PCB layout routing provides a lowresistance pathway into and out of the device under test. The test points are designed as separate
voltage sensing connections on the PCB for accurate voltage and RON measurements where thetest results are not influenced by voltage drops created by the load current. Solid 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 and output of the loadswitch to allow a simple and very convenient connection of oscilloscope probes.

Fig. 1.

NEVB-NPS1000- evaluation board for load switch IC NPS1000

1.1. EVB key parameters•••••

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EVB name = NEVB-NPS1000
Device = NPS1000
EVB input voltage range (VIN): 0.5 V to 1 V
EVB maximum current = 600 mA RMS (1.5 A peak)
EVB features:• Soft start• Over temperature protection• Bias UVLO protection

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1.2. Features
••
•
•
•
•

Input voltage can be supplied via the test points J3 (VIN), VIN can range from 0.5 V to 1 V.
A test load can be connected to terminal J4 (VOUT).
Alternatively, there are GND test points at TP4, TP5, TP6, and TP7.
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 (EN) and the bias pin (BIAS) both have convenient connections to a pin header
and miniature test point, which allows seamless oscilloscope connection while driving the pinswith external sources.
VIN_Sense (TP2) and VOUT_Sense (TP8) are used when accurate measurements of the input
or output are required. Make RON measurements using these Kelvin sense connections whenmeasuring the voltage drop from VIN to VOUT.

2. SchematicFig. 2 shows the schematic diagram of the NEVB-NPS1000 evaluation board. The components,solder pins, connectors and test points described in the feature list above can be found here.
V bias

V biasFig. 2.

BIAS

NEVB-NPS1000 schematic diagram

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3. PCB layout
Fig. 3 shows the PCB layout of the NEVB-NPS1000. The PCB measures 44 mm x 30 mm and has
two copper layers, the top copper layer is shown in a), the bottom layer is shown in b). Figure
Fig. 4 shows the PCB silkscreen.

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

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NEVB-NPS1000 PCB layout

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Fig. 4.

NEVB-NPS1000 PCB silkscreen

4. Bill of Materials (BOM)
Table 1. NPS1000 EVB Bill of Materials
Reference
Quantity
Description
designator

MFG

Component

1

Printed Circuit Board

C1, C2, C3,C4,C7, C8, C10,C11822 µF ±20% 4V Ceramic Capacitor X6S 0402
(1005 Metric)

C61

0.1 µF ±20% 10V Ceramic Capacitor X7R 0402 Taiyo Yuden(1005 Metric)

LMF105B7104MVHF

C9, C122

2.2 µF ±20% 10V Ceramic Capacitor X7S 0402 Murata(1005 Metric)

GRM155C71A
225ME11DC511 µF ±10% 10V Ceramic Capacitor X7R 0402(1005 Metric)

Murata

GRM155Z71A105KE01J

J11CONN HEADER VERT 1POSTE Connectivity

103327-1

J3, J4,2CONN HEADER VERT 2POS 2.54MMTE Connectivity

282834-2

J21CONN HEADER VERT 2POS 2.54MMTE Connectivity

103327-2

R1,R3

20 Ohms Jumper Chip Resistor 0402 (1005Metric) Automotive AEC-Q200 Thick Film

Vishay Dale

CRCW04020000
Z0EDC

R21RES 100K OHM 1% 1/16W 0402

Yageo

RC0402FR-07100KL

TP1, TP2, TP3,TP4, TP5, TP6,TP7, TP88PC TEST POINT MINIATURE

Keystone

5019

U11NPS1000 Load Switch IC
Package_WLCSP8_SOT8068

Nexperia

NPS1000

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PCB
Murata

GRM158C80G
226ME01J© Nexperia B.V. 2024. All rights reserved

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5. Set up and operation
The NEVB-NPS1000 board is easy to set up and operate. This chapters gives some instructions
for proper use.

5.1. Input supplyThe input voltage source VIN is connected to the points J3 (IN), VIN. This is where the positive
lead is connected and accepts 0.5 V to 1 V. It is recommended to limit the current from the external
power supply to 4.5 A to prevent damage to the device in an overcurrent event. The points J3(GND), J4 (GND), TP4, TP5, TP6, TP7 are the ground connections.
The bias voltage source Vbias is connected to the points J1 and TP3. This is where a separate bias
voltage supply is used to power the device. The recommended voltage range for Vbias is 2.3 Vto 5 V.

5.2. Load switch output
Loads at the output can be connected via the connection terminal J4 (OUT). The direct groundconnections are appropriately labeled across the EVM as well as J4 (GND). The range of load
currents that can be supported are 0 A to 0.6 A RMS continuous with a 1.5 A peak current.

5.3. Enable control
Connector J2 connects the enable input EN of the load switch IC to either a separate supplyor GND, hence turning the load switch IC ON or OFF. The range of voltages the EN pin canaccommodate are from 0 V to 5 V. The voltage threshold at which the device turns from its OFF
state to its ON state is 0.72 V on the EN pin. External control signals can be applied via J2 pin
2 from an external function generator for example see Fig. 5. A minimum of 5 µs on/off time isrequired for toggling the EN high or low depending on the desired state of the load switch.
aaa-037916

1

Function
GeneratorFig. 5.

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2R1
0100k

J2R2NEVB-NPS1000 enable options

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5.4. Voltage sense test points
The NEVB-NPS1000 includes Kelvin sense test points for VIN and VOUT, these are labeled
VIN_Sense and VOUT_Sense. These test pins allow for precise measurement of the input andoutput voltages present at the package pins of the load switch IC. At these test points there is noinfluence from voltage drop due to the impedance of the PCB traces. Ron can be evaluated withexact results at these test points as:
R ON =( VIN_Sense - VOUT_Sense(I OUT(1)

5.5. Start-up operation
To start operating the NEVB-NPS1000, connect a power supply with 0.5 V to 1 V to VIN. The loadswitch needs to be enabled by a separate control signal to J2 Pin 2 (EN), and by applying a voltage
between 2.3 V and 5 V to the Vbias pin located at J1 (BIAS).
The order of operation for powering the load switch is as follows:
1) Turn on the bias voltage (2.3 V to 5 V)
2) Apply voltage to VIN (0.5 V to 1 V)
3) Apply voltage at EN to turn on the device (1.2 V to 5 V)
4) Turn on load
Various output loads can be applied to the switch by using the J4 terminal (0 A to 0.6 A RMS with
1.5 A peak). When the EN pin is asserted high, the output of the NPS1000 is enabled. When theEN is disabled, the output rail will discharge through the internal quick output discharge resistanceof the device.

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6. Test configurations
6.1. Dynamic parameter testing
Dynamic parameters like the smooth turn-on of the NPS1000 can be measured at VOUT_Sense
using an oscilloscope. At TP1 the enable signal can be accessed and used as trigger signal.
Fig. 6 shows the oscilloscope connection points for measurement of VIN and VOUT with triggeringfrom the enable input. With the same set-up the fall time of VOUT can be measured.

DC Power
Supply #2

DC Power

ElectronicLoad

Supply #1

Function
Generator
aaa-037918

Fig. 6.

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

6.1.1. Rise time (tr) and fall time (tf)The rise time and fall times of the NPS1000 output can be measured using the test set up in Fig. 6.
For a typical test set up:
1) Set the bias voltage supply of the supply between 2.3 V and 5 V at J1 or TP3
2) Set the input voltage supply between 0.5 V and 1.0 V at J3 (VIN)3) Configure an oscilloscope to trigger on the rising (for rise time) or falling (for fall time) edge of theEN signal. This will allow the capture of the output waveform once the trigger level is met. The EN
signal can be set between 0 V and 5 V using a function generator to program the EN pulse. Theenable high threshold for the EN pin is 0.72 V and the enable low threshold for the EN pin is 0.32 V.
This input is located at J2 or TP1. Vout_SENSE is located at TP8.

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Fig. 7 and Fig. 8 show the rise time and fall time measurements of the NPS1000.

ENV OUTI IN

VIN = 1 V; EN = 1.2 V; Vbias = 2.5 V; CLoad = 66 µF; Temperature = 25 °C
Fig. 7.

Oscilloscope plot for output rise time (tr)V OUTENI IN

VIN = 1 V; EN = 1.2 V; Vbias = 2.5 V; CLoad = 66 µF; Temperature = 25 °C
Fig. 8.

Oscilloscope plot for output fall time (tf)

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7. Revision history
Table 2. Revision history
Revision
DatenumberDescription

1.22024-06-24

Board name corrected in Section 3.

1.12024-04-05

Board name corrected in Section 1.1.

1.0

2024-02-19

Initial version.

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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 any
representations 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 or
warranted 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 anyliability 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. NPS1000 EVB Bill of Materials.............................. 5
Table 2. Revision history....................................................10

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List of Figures
Fig. 1. NEVB-NPS1000- evaluation board for loadswitch IC NPS1000.............................................................. 2
Fig. 2. NEVB-NPS1000 schematic diagram.........................3Fig. 3. NEVB-NPS1000 PCB layout.....................................4Fig. 4. NEVB-NPS1000 PCB silkscreen.............................. 5
Fig. 5. NEVB-NPS1000 enable options............................... 6
Fig. 6. Measurement set-up for dynamic parameters
e.g. VOUT rise and fall times.............................................. 8Fig. 7. Oscilloscope plot for output rise time (tr).................. 9Fig. 8. Oscilloscope plot for output fall time (tf)....................9UM90027
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Contents
1. Introduction................................................................... 2
1.1. EVB key parameters................................................... 2
1.2. Features.......................................................................3
2. Schematic......................................................................33. PCB layout.................................................................... 4
4. Bill of Materials (BOM)................................................. 5
5. Set up and operation................................................... 6
5.1. Input supply................................................................. 65.2. Load switch output...................................................... 65.3. Enable control..............................................................65.4. Voltage sense test points............................................ 75.5. Start-up operation........................................................ 7
6. Test configurations.......................................................86.1. Dynamic parameter testing..........................................86.1.1. Rise time (tr) and fall time (tf)................................... 87. Revision history..........................................................10
8. Legal information........................................................11© 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: 24 June 2024

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