SOT23-3
Voltage Regulator
Evaluation Board
User’s Guide
© 2008 Microchip Technology Inc.
DS51785A
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•
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Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
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Company are registered trademarks of Microchip Technology
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Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM,
PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,
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© 2008, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
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are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS51785A-page ii
© 2008 Microchip Technology Inc.
SOT23-3 VOLTAGE REGULATOR
EVALUATION BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Introduction............................................................................................................ 1
Document Layout .................................................................................................. 1
Conventions Used in this Guide ............................................................................ 2
Recommended Reading........................................................................................ 3
The Microchip Web Site ........................................................................................ 3
Customer Support ................................................................................................. 3
Document Revision History ................................................................................... 3
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 5
1.2 What is the SOT23-3 Voltage Regulator Evaluation Board? .......................... 5
1.3 What the SOT23-3 Voltage Regulator Evaluation Board kit includes? .......... 6
Chapter 2. Installation and Operation
2.1 Introduction ..................................................................................................... 7
2.2 Features ......................................................................................................... 7
2.3 Getting Started ............................................................................................... 7
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 11
A.2 Board - Schematic ....................................................................................... 12
A.3 Board - Top Silk and Pads ........................................................................... 13
A.4 Board - Top Copper ..................................................................................... 14
A.5 Board - Bottom Copper ................................................................................ 15
Appendix B. Bill of Materials (BOM)
Worldwide Sales and Service .................................................................................... 18
© 2008 Microchip Technology Inc.
DS51785A-page iii
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
NOTES:
DS51785A-page iv
© 2008 Microchip Technology Inc.
SOT23-3 VOLTAGE REGULATOR
EVALUATION BOARD USER’S GUIDE
Preface
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the
document.
For the most up-to-date information on development tools, see the MPLAB® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
SOT23-3 Voltage Regulator Evaluation Board. Items discussed in this chapter include:
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Recommended Reading
The Microchip Web Site
Customer Support
Document Revision History
DOCUMENT LAYOUT
This document describes how to use the SOT23-3 Voltage Regulator Evaluation Board
as a development tool to emulate and debug firmware on a target board. The manual
layout is as follows:
• Chapter 1. “Product Overview” – Important information about the SOT23-3
Voltage Regulator Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this evaluation board and a description of the evaluation board
operation.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the SOT23-3 Voltage Regulator Evaluation Board.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
SOT23-3 Voltage Regulator Evaluation Board.
© 2008 Microchip Technology Inc.
DS51785A-page 1
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS51785A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2008 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use SOT23-3 Voltage Regulator Evaluation Board.
Other useful documents are listed below. The following Microchip documents are
available and recommended as supplemental reference resources.
• MCP1700A Datasheet, “Low Quiescent Current LDO” (DS-22069)
• MCP1701A Datasheet, “2 µA Low Dropout Positive Voltage Regulator”
(DS-21991)
• MCP1702 Datasheet, “250 mA Low Quiescent Current LDO Regulator”
(DS-22008)
• MCP1703 Datasheet, “250 mA, 16V, Low Quiescent Current LDO” (DS-22049)
These datasheets provide useful information regarding voltage regulator parameters
that may be validated using this evaluation board.
THE MICROCHIP WEB SITE
Microchip provides online support via our web site at www.microchip.com. This web
site is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the web site contains the following
information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
•
•
•
•
Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Technical Support
Customers should contact their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers. A listing of
sales offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com.
DOCUMENT REVISION HISTORY
Revision A (December 2008)
• Initial Release of this Document.
© 2008 Microchip Technology Inc.
DS51785A-page 3
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
NOTES:
DS51785A-page 4
© 2008 Microchip Technology Inc.
SOT23-3 VOLTAGE REGULATOR
EVALUATION BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The SOT23-3 Voltage Regulator Evaluation Board is designed to provide functional
evaluation of Microchip Voltage Regulators that utilize the SOT23-3 package and the
following device pinouts:
Pin No.
U2 Footprint
U1 Footprint
1
VIN
GND
2
GND
VOUT
3
VOUT
VIN
The SOT23-3 Voltage Regulator Evaluation Board does not come with a voltage
regulator soldered onto the board. This allows the user to attach the voltage regulator
of their choosing to the board and perform quiescent current, ground current, Power
Supply Ripple Rejection (PSRR), and other desired tests.
The SOT23-3 Voltage Regulator Evaluation Board is based upon a modulare concept
which will allow the user to plug in additional boards to increase the test capability of
the voltage regulator. Planned additional modulare plug-in boards currently consist of
an Input Voltage Linestep Board, Output Voltage Loadstep Board, and several other
device packages.
1.2
WHAT IS THE SOT23-3 VOLTAGE REGULATOR EVALUATION BOARD?
The SOT23-3 Voltage Regulator Evaluation Board is designed to evaluate and test
voltage regulators. By soldering the desired device to the evaluation board, the user
can easily validate several parameters of the device.
1.2.1
Funtional Blocks
The SOT23-3 Voltage Regulator Evaluation Board can be broken up into 3 functional
blocks. These blocks are as follows:
• Input Capacitance
• Ground Current Measurement
• Load Resistor
1.2.2
Input Capacitance
Jumper JP1 connects the input capacitance to the circuit. The input capacitor is
disconnected when performing PSRR tests. By default, C1 is populated with a 1 µF,
50V, XR7 ceramic capacitor.
1.2.3
Ground Current Measurement
Jumper JP3 allows measurement of ground current. When a current meter is
connected to TP6 and TP7 and jumper JP3 is removed, the ground current of the
device may be measured.
© 2008 Microchip Technology Inc.
DS51785A-page 5
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
1.2.4
Load Resistor
R5 may be populated with the desired load resistor value for the device being
evaluated. JP4 connects R5 to the device output.
1.2.5
Output Capacitor
C2 may be populated with the desired surface mount output capacitance. By default,
C2 is populated with a 1 µF, 6.3V, XR7 ceramic capacitor.
1.2.6
Power Supply
J1 or TP1 and TP2 are connected to the user’s power supply.
1.2.7
Device Selection
JP2 and JP5 select either device U1 or device U2. Placing the jumper on pins 1-2 of
JP2 and JP5 selects the device at U2. Placing the jumper on pins 2-3 of JP2 and JP5
selects the device at U1.
1.3
WHAT THE SOT23-3 VOLTAGE REGULATOR EVALUATION BOARD KIT
INCLUDES?
This SOT23-3 Voltage Regulator Evaluation Board kit includes:
• SOT23-3 Voltage Regulator Evaluation Board (102-00200)
• Analog and Interface Products Demonstration Boards CD-ROM includes:
- SOT23-3 Voltage Regulator Evaluation Board User’s Guide, (DS51785)
DS51785A-page 6
© 2008 Microchip Technology Inc.
SOT23-3 VOLTAGE REGULATOR
EVALUATION BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The SOT23-3 Voltage Regulator Evaluation Board is designed to be used to facilitate
the evaluation of Microchip’s voltage regulators, or to be used as a stand-alone voltage
regulator board. Jumpers have been placed on the board to ease the test of the
specific voltage regulator parameters.
The SOT23-3 Voltage Regulator Evaluation Board kit comes with a 1 μF ceramic input
and output capacitor soldered to the board. The board has two unpopulated resistor
locations that may be used for loads.
2.2
FEATURES
The SOT23-3 Voltage Regulator Evaluation Board has the following features:
• Input and Output headers for future connection to Line Step and Load Step
modules
• Ample testpoints to attach multimeters, power supplies, and loads
• Jumper to select ground current measurement
• Jumper to connect output load resistor
• Jumper to connect input capacitor to circuit
• Jumper to select one of two device pinouts
2.3
GETTING STARTED
The SOT23-3 Voltage Regulator Evaluation Board is fully assembled and tested. All
that is required for operating is a voltage regulator supplied by the user, and a supply
voltage source. Some of the tests that may be completed using the SOT23-3 Voltage
Regulator Evaluation Board are described in the next subchapters.
2.3.1
Device Pinout Selection (For All Tests)
For all tests, JP2 and JP5 must be set to select the desired device and footprint.
Jumpers
U1 Footprint
U2 Footprint
JP2 - connect pins
2-3
1-2
JP5 - connect pins
2-3
1-2
© 2008 Microchip Technology Inc.
DS51785A-page 7
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
2.3.2
Ground Current and Quiescent Current
When measuring ground current, jumper JP3 should be removed, otherwise leave
jumper JP3 on. To measure ground current, perform the following steps:
1. Add the desired load resistor to R5.
2. Remove jumpers JP3 and JP4.
3. Connect an ammeter across testpoints TP6(+) and TP7(-). Select the
appropriate meter scale for the device that is being evaluated.
4. Connect a voltmeter across testpoints TP9(+) and TP10(-).
5. Add jumper JP1.
6. Apply source voltage to testpoints TP1(+) and TP2(-).
7. Verify that the voltage across testpoints TP9 and TP10 is within the expected
range of the tested device.
8. Read the Ground Current directly from the ammeter connected to testpoints TP6
and TP7.
9. Vary the input voltage to obtain data for ground current versus input voltage.
With no load attached to the output of the voltage regulator, the measured
“ground current” is also called the “quiescent current” of the regulator.
10. Add the load selection jumper, JP4.
11. Read the Ground Current directly from the ammeter connected to testpoints TP6
and TP7.
12. The data collected will be the “ground current” versus load current.
2.3.3
Load Resistance
R5 is used to set the desired load value. One choice is to set R5 to the minimum current
wanted for testing.
2.3.4
Line Step
Dynamic Line Step response may be evaluated by connecting an electronically
switched input voltage to testpoints TP1(+) and TP2(-), or to connector J1. An
oscilloscope is connected to TP3(Ch1 Trigger), TP9(Ch2) and TP10(Gnd). An
appropriate load is selected using R5 and JP4. The input voltage is then electronically
switched from a low voltage to a high voltage. The corresponding voltage waveform
data of the voltage regulator response is captured by the oscilloscope. Microchip will
be offering a Line Step module, part #102-00196, that connects directly to
connector J1. The Line Step module will be capable of switching between two voltage
levels that the user supplies.
2.3.5
Load Step
Dynamic Load Step response may be evaluated by connecting an electronically
switched load to testpoints TP9(+) and TP10(-) or to connector P1. An oscilloscope is
connected to the electronic load switch signal (Ch1 Trigger) and to TP9 (Ch2) and
TP10 (Gnd). The load is then electronically switched from a high resistance to a lower
one. The corresponding voltage waveform data of the voltage regulator response is
captured by the oscilloscope. Microchip will be offering a Load Step module, part
#102-00197, that connects directly to connector P1. The Load Step module will have
several selectable load values populated on board to cover a wide range of loads. The
load will have the ability to be electronically or manually switched.
DS51785A-page 8
© 2008 Microchip Technology Inc.
Installation and Operation
2.3.6
Power Supply Rejection Ratio (PSRR)
Power Supply Rejection Ratio tests are performed by removing the input capacitor
jumper, JP1, and connecting an appropriate PSRR analyzer to the SOT23-3 Voltage
Regulator Evaluation Board. The PSRR analyzer may then sweep the input voltage
frequencies and record the corresponding output voltages.
© 2008 Microchip Technology Inc.
DS51785A-page 9
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
NOTES:
DS51785A-page 10
© 2008 Microchip Technology Inc.
SOT23-3 VOLTAGE REGULATOR
EVALUATION BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematis and layouts for the SOT23-3 Voltage
Regulator Evaluation Board:
•
•
•
•
Board - Schematic
Board - Top Silk and Pads
Board - Top Copper
Board - Bottom Copper
© 2008 Microchip Technology Inc.
DS51785A-page 11
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
BOARD - SCHEMATIC
REV
Revision Notes
1
Initial Release
Date
18-FEB-2008
A.2
DS51785A-page 12
© 2008 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD - TOP SILK AND PADS
© 2008 Microchip Technology Inc.
DS51785A-page 13
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
A.4
BOARD - TOP COPPER
DS51785A-page 14
© 2008 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD - BOTTOM COPPER
© 2008 Microchip Technology Inc.
DS51785A-page 15
SOT23-3 Voltage Regulator Evaluation Board User’s Guide
NOTES:
DS51785A-page 16
© 2008 Microchip Technology Inc.
SOT23-3 VOLTAGE REGULATOR
EVALUATION BOARD USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
1
C1
CAP CERAMIC 1.0 μF 50V X7R 0805
Murata Electronics® GRM21BR71H105KA12L
1
C2
CAP CERAMIC 1.0 uF 16V X7R 0805
Kemet® Electronics C0805C105K4RACTU
Corp.
1
J1
2 pin RA header, 0.100 centers, 0.025 sq
3M
pins, 0.070 pcb to pin center height, 36 pins to
a strip (yields 18 headers)
3
JP1, JP3,
JP4
2 pin header, 0.100 centers, 0.025 sq pins,
0.070 pcb to pin center height, 36 pins to a
strip (yields 18 headers)
Molex® Electronics
22-28-4360
2
JP2, JP5
3 pin header, 0.100 centers, 0.025 sq pins,
0.070 pcb to pin center height, 36 pins to a
strip (yields 12 headers)
Molex Electronics
22-28-4360
5
JP1, JP2,
JP3, JP4,
JP5
Connector, Shorting jumper, Tin, 0.100”
Sullins
STC02SYAN
1
P1
RA socket, 0.100 centers, 0.025 sq pins,
0.070 pcb to pin center height
Sullins
PPPC021LGBN-RC
1
PCB
RoHS Compliant Bare PCB, SOT23-3 Voltage Microchip
Regulator Evaluation Board
Technology Inc.
104-00200
1
R5
DO NOT POPULATE
–
–
8
TP1, TP2,
TP3, TP4,
TP6, TP7,
TP9, TP10
SMT Testpoint
Keystone
Electronics®
5016
2
U1,U2
DO NOT POPULATE
–
–
4
On Each
Corner
Bumpon Hemisphere 0.44 x 0.20 Clear
3M
SJ-5303 (Clear)
Note 1:
929835-01-36-RK
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM
used in manufacturing uses all RoHS-compliant components.
© 2008 Microchip Technology Inc.
DS51785A-page 17
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
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Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
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Tel: 86-755-8203-2660
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Tel: 886-3-572-9526
Fax: 886-3-572-6459
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Tel: 86-27-5980-5300
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Tel: 886-7-536-4818
Fax: 886-7-536-4803
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Tel: 86-592-2388138
Fax: 86-592-2388130
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Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
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Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
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Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
01/02/08
DS51785A-page 18
© 2008 Microchip Technology Inc.