Microchip Technology MCP16311/2 User Manual

MCP16311/2

Synchronous Buck Converter

Evaluation Board

User’s Guide

 2013 Microchip Technology Inc. DS50002111A

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32

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DS50002111A-page 2  2013 Microchip Technology Inc.

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®

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®

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Object of Declaration: MCP16311/2 Synchronous Buck Converter Evaluation Board
User’s Guide

 2013 Microchip Technology Inc. DS50002111 A-page 3

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

NOTES:

DS50002111A-page 4  2013 Microchip Technology Inc.

MCP16311/2 SYNCHRONOUS

BUCK CONVERTER EVALUATION

BOARD USER’S GUIDE

Table of Contents

Preface ...........................................................................................................................7

Introduction............................................................................................................7

Document Layout .................................................................................................. 7

Conventions Used in this Guide............................................................................ 8

Recommended Reading.............................................................. .. ........................9

The Microchip Web Site........................................................................................ 9

Customer Support....................... ....................................................... ...................9

Document Revision History................................................................................... 9

Chapter 1. Product Overview

1.1 Introduction ...................................................................................................11

1.2 What is the MCP16311/2 Synchronous Buck Converter

Evaluation Bo a rd ? ......... ....................................................... .................. 12

1.3 What the MCP16311/2 Synchronous Buck Converter

Evaluation Bo a rd C ontains ..................................................................... 12

Chapter 2. Installation and Operation

2.1 Introduction ...................................................................................................13

2.2 Board Featu r e s ........... ..................................................................................14

2.3 Getting Sta rted ............................................................................................. 14

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................17

A.2 Board – Schematic ... .................................................................... ................ 18

A.3 Board – Top Sil k ............ .............................................................................. 19

A.4 Board – Top Copper ....................................................................................19

A.5 Board – Top Copper and Silk .......................................................................20

A.6 Board – Bottom Copper ...............................................................................20

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service ....................................................................................22

 2013 Microchip Technology Inc. DS50002111A-page 5

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

NOTES:

DS50002111A-page 6  2013 Microchip Technology Inc.

MCP16311/2 SYNCHRONOUS BUCK

CONVERTER 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 p age 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
Select the Help menu, and then Topics to open a list of available online help files.

®

IDE online help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the
MCP16311/2 Synchronous Buck Converter 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 MCP16311/2 Synchronous Buck Converter
Evaluation Board as a development tool. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP16311/2
Synchronous Buck Converter Evaluation Board.

• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this user’s guide and a description of the user’s guide.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP16311/2 Synchronous Buck Converter Evaluation Board.

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP16311/2 Synchronous Buck Converter Evaluation Board.

 2013 Microchip Technology Inc. DS50002111A-page 7

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following docum entat io n conven tion s:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic chara c ters Referenced books MPLAB

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog
A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with
right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brac kets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe
character: { | }

Ellipses... Replaces r epeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the tota l number of
digits, R is th e radi x and n is a
digit.

Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’

Choice of mut ually exclus ive
arguments; an OR selection

Represents code supplied by
user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options]
errorlevel {0|1}

var_name...]
void main (void)

{ ...
}

®

IDE User’s Guide

DS50002111A-page 8  2013 Microchip Technology Inc.

RECOMMENDED READING

This user’s guide describes how to use the MCP16311/2 Synchronous Buck Converter
Evaluation Board. Another useful document is listed below. The following Microchip
document is available and recommended as a supplemental reference resource.

• MCP16311/2 Data Sheet – “30V Input, 1A Output, High-Efficiency, Integrated
Synchronous Switch Step-Down Regulator” (DS20005254)

This dat a sheet provides detailed information regarding the MCP16311/2 device.

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

Preface

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://www.microchip.com/support.

DOCUMENT REVISION HISTORY

Revision A (December 2013)

• Initial Release of this Document.

 2013 Microchip Technology Inc. DS50002111 A-page 9

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

NOTES:

DS50002111A-page 10  2013 Microchip Technology Inc.

Chapter 1. Product Overview

V

IN

GND

V

FB

SW

V

IN

5V to 30V

V

OUT

3.3V @ 1A
C

OUT

2x10µF

C

IN

2x10µF

L

1

15 µH

BOOST

31.2 k

10 k

EN

C

VCC

1µF

C

BOOST

100 nF

V

CC

1.1 INTRODUCTION

The MCP16311/2 is a compact, high-efficiency, fixed-frequency, step-down DC-DC
converter. The integrated features include a high-side and a low-side switch, fixed
frequency, internal compensation, peak current limit and overtemperature protection.
This product provides an easy-to-use power supply solution, with a minimum number
of external components.

The MCP16311 automatically selects the best operating mode for efficiency,
Pulse-Width Modulation (PWM) or Pulse Frequency Modulation (PFM), while the
MCP16312 is a PWM-only device. The MCP16311/2 family of devices have a wide
input voltage range (4V to 30V) and a wide output voltage range (2V – 15V). An
integrated, precise 0.8V reference, combined with an external resistor divider, sets the
desired converter output voltage. The internal reference voltage is controlled during
start-up, minimizing the output voltage overshoot and the inrush current.

The device is available in 8LD MSOP and 2 x 3 mm TDFN packages.
The scope of this evaluation board is to demonstrate the features of the MCP16311/2.
This chapter provides an overview of the MCP16311/2 Synchronous Buck Converter

Evaluation Board and covers the following topics:

• What is the MCP16311/2 Synchronous Buck Converter Evaluation Board?

• What the MCP16311/2 Synchronous Buck Converter Evaluation Board Contains

MCP16311/2 SYNCHRONOUS BUCK

CONVERTER EVALUAT ION BOARD

USER’ S GUIDE

FIGURE 1-1: Typical MCP16311/2 Buck Converter Application.

 2013 Microchip Technology Inc. DS50002111A-page 11

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

1.2 WHAT IS THE MCP16311/2 SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD?

The MCP16311/2 Synchronous Buck Converter Evaluation Board is used to evaluate
and demonstrate Microchip Technology’s MCP16311/2 product. This board
demonstrates the MCP16311 (PFM/PWM – low quiescent current) and the MCP16312
(PWM only – low output voltage ripple) in two buck converter applications with two
output voltages. It can be used to evaluate both package options, 8LD MSOP and 8LD
2 x 3 TDFN. The MCP16311/2 Synchronous Buck Converter Evaluation Board was
developed to help engineers reduce the product design cycle time.

Two common output voltages can be selected: 3.3V and 5.0V. The first converter with
the 8LD MSOP package is a PWM/PFM device with a fixed output of 3.3V, while the
second converter with the 2 x 3 8LD TDFN package is a PWM-only device, with a fixed
output of 5V.

1.3 WHAT THE MCP16311/2 SYNCHRONOUS BUCK CONVERTER EVALUATION BOARD CONTAINS

The MCP16311/2 Synchronous Buck Converter Evaluation Board kit includes:

• MCP16311/2 Synchronous Buck Converter Evaluation Board (ADM00467)

• Important Information Sheet

DS50002111A-page 12  2013 Microchip Technology Inc.

Chapter 2. Installation and Operation

GND

VIN

_

+

U

1

EN

3

V

IN

4

V

CC

2

A

GND

8

P

GND

5

BOOST

7

SW

6

VFB

1

GND

–

V

OUT

+

C2

10 µF

C3

10 µF

C

VCC

1µF

C5

10 µF

C6

10 µF

C1

0.1 µF
L

1

R

T

R

B

R

EN

1M

Note: Calculate RT resistors for a particular V

OUT

as:

VFB=0.8V (for MCP16311/2)

For the inductor value, see Table 2-1.

RTR

B

V

OUT

V

FB

------------- 1–







=

2.1 INTRODUCTION

The MCP16311/2 device is capable of regulating the output voltage over a wide 2V to
15V range, and typically can deliver over 1A of load current at 3.3V output when
supplied from a 12V input. The input voltage range is 4V to 30V. The regulated output
voltage (V

MCP16311/2 SYNCHRONOUS BUCK

CONVERTER EVALUATION BOARD

USER’S GUIDE

) should be lower than the input voltage (VIN).

OUT

FIGURE 2-1: MCP16311/2 Synchronous Buck Typical Application.

The MCP16311/2 Synchronous Buck Converter Evaluation Board offers both package
types in two buck-converter applications for 3.3V and 5.0V output voltage options. The
output voltage can be modified by changing the resistors in the feedback loop based
on the formula in Figure 2-1.

 2013 Microchip Technology Inc. DS50002111A-page 13

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

2.2 BOARD FEATURES

The MCP16311/2 Synchronous Buck Converter Evaluation Board has the following
features:

• Input Voltage Range (V

): 4V to 30V

IN

• Fixed Output Voltage: 3.3V and 5.0V

• Output Current: typically 1A @ 3.3V Output, 12V Input

• Automatic PFM/PWM Operation for MCP16311, or PWM-only for MCP16312

• PWM Switching Frequency : 500 kHz

• Internal Compensation

• Internal Soft Start

• Overtemperature protection (if the die temperature exceeds +150°C, 25°C
hysteresis)

2.3 GETTING STARTED

The MCP16311/2 Synchronous Buck Converter Evaluation Board is fully assembled
and tested to evaluate and demonstrate the MCP16311/2 products. This board
requires the use of external lab supplies and load.

2.3.1 Power Input and Output Connection

2.3.1.1 POWERING THE MCP16311/2 SYNCHRONOUS BUCK CONVERTER

EVALUATION BOAR D

The evaluation board has two independent circuit applications. One uses the
MCP16311 in the 8LD MSOP package, the other uses the MCP16312 device in the
8LD TDFN package. The 8LD MSOP package has an output voltage setting of 3.3V.
The 8LD TDFN package has an output voltage setting of 5.0V.

The switch pea k current li mit will pro vide a sa fe maximum cu rrent value. The maximum
output current for the converters will vary with input and output voltages. Refer to the
MCP16311/2 data sheet for more information on the maximum output current.

2.3.1.2 BOARD POWER-UP PROCEDURE

1. Connect power supply at input. Input voltage should be higher than V

Connect system load to V

and GND terminals; maximum load varies with

OUT

OUT

.

input and output voltage (see the MCP16311/2 data sheet for more information
on the maximum load). Connect the (+) side of the load to V

and the (–) load

OUT

to GND terminals.

2. By default, the EN pin is pulled high through a resistor, so the converter is

enabled and V
EN is pulled low, the converter is disabled and V

can be measured between V

OUT

and GND terminals. When

OUT

is floating and disconnected

OUT

from the input.

3. The measured output voltage should be 3.3V/5V . Adjusting the input voltage and

load should not cause the output to vary more than a few mV over the operating
range of the converter.

DS50002111A-page 14  2013 Microchip Technology Inc.

Installation and Operation

12V DC

Power Supply

Resistive Load

33/1W

V-meter

12V DC

Power Supply

Resistive Load

50/1W

V-meter

R

T

R

B

V

OUT

V

FB

------------ -





1–



=

Where:

V

FB

= 0.8V

FIGURE 2-2: MCP16311/2 Synchronous Buck Converter Evaluation Board
Setup.

2.3.1.3 ADJUSTABLE V

SETTING

OUT

The resistor divider RT and RB are used to set the converter output voltage. If the
output voltage is modified by changing the feedback resistors, the inductor should also
be changed. Check Table 2-1 for the value of the inductor or the MCP16311/2 data
sheet for more information. The output voltage can be calculated using the following
equation:

TABLE 2-1: RECOMMENDED INDUCTOR VALUES

V

OUT

2.0V 10 µH

3.3V 15 µH

5.0V 22 µH
12V 56 µH
15V 68 µH

Inductor Value

 2013 Microchip Technology Inc. D S50002111A-page 15

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

NOTES:

DS50002111A-page 16  2013 Microchip Technology Inc.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP16311/2
Synchronous Buck Converter Evaluation Board:

• Board – Schematic

• Board – Top Silk

• Board – Top Copper

• Board – Top Copper and Silk

• Board – Bottom Copper

MCP16311/2 SYNCHRONOUS BUCK

CONVERTER EVALUATION BOARD

USER’S GUIDE

 2013 Microchip Technology Inc. DS50002111A-page 17

FB

1

VCC

2

EN

3

VIN

4

PWRGND

5

SW

6

BOOST

7

AGND

8

U1

MCP16311

10uF
1210

C3

10uF
1210

C2

GND GND AGND AGND

1

J1

VIN

1

J2

GND

0.1uF
0603

C1

AGND

1

J4

GND

1

J3

VOUT

15uH/1.6A

L1

GND GNDGND

AGND GND

10uF

1206

C5

10uF

1206

C6

FB

1

VCC

2

EN

3

VIN

4

PWRGND

5

SW

6

BOOST

7

AGND

8

U2

MCP16312

10uF
1210

C8

10uF
1210

C7

GND2 GND2

1uF
0603

CVCC2

AGND2 AGND2

1

J5

VIN

1

J6

GND

0.1uF
0603

C12

AGND2

1

J8

GND

1

J7

VOUT

SW

GND2 GND2GND2

AGND2 GND2

10uF

1206

C10

10uF

1206

C11

1uF
0603

CVCC

SW

EN

VCC

EN

VCC

52.3k

RT2

30.9k

RT

22uH/1.41A

L2

10k

RB

10k

R2

1M

REN

1M

REN2

DS50002111A-page 18  2013 Microchip Technology Inc.

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s

A.2 BOARD – SCHEMATIC

A.3 BOARD – TOP SILK

Schematic and Layouts

A.4 BOARD – TOP COPPER

 2013 Microchip Technology Inc. D S50002111A-page 19

MCP16311/2 Synchronous Buck Converter Evaluation Board User’s Guide

A.5 BOARD – TOP COPPER AND SILK

A.6 BOARD – BOTTOM COPPER

DS50002111A-page 20  2013 Microchip Technology Inc.

MCP16311/2 SYNCHRONOUS BUCK

CONVERTER EVALUATION BOARD

USER’S GUIDE

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

2 C1, C12 CAP CER 0.1 µF 50V X7R 10% 0603 TDK Corporation C1608X7R1H104K
4 C2, C3,

C7, C8

4 C5, C6,

C10, C11

2 CVCC,

CVCC2

8 J1, J2, J3,

J4, J5, J6,

J7, J8
1 L1 CHOKE, SMD, 15 µH Wurth Group 7447779115
1 L2 CHOKE, SMD, 22 µH Wurth Group 7447779122
1 PCB Printed Circuit Board – MCP16311/2

2 RB, RB2 RES 10k Ohm 1/10W 1% 0603 SMD Panasonic
2REN,

REN2
1 RT RESISTOR, 0603 30K9 Multicomp
1 RT2 RES 52.3k OHM 1/10W 1% 0603 SMD Panasonic – ECG ERJ-3EKF5232V
1 U1 30V SYNCHRO NOUS BUCK VOLTAGE

1 U2 30V SYNCHRO NOUS BUCK VOLTAGE

Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The

CAP CER 10 µF 50V X7S 1210 TDK Corporation C3225X7S1H106M

CAPACITOR, 1206, X7R, 16V, 10 µF TDK Corporation C3216X7R1C106K

CAP CER 1 µF 16V 10% X7R 0603 TDK Corporation C1608X7R1C105K

PC TEST POINT TIN SMD Harwin Plc. S1751-46R

— 104-00467
Synchronous Buck Converter Evaluation
Board

®

– ECG ERJ-3EKF1002V

RES 1M Ohm 1/10W 5% 0603 SMD Panasonic – ECG ERJ-3GEYJ105V

REGULATOR

REGULATOR

®

Microchip

Technology Inc.

Microchip

Technology Inc.

MC 0.063W 0603 1% 30K9

MCP16311-E/MS

MCP16312T-E/MNY

released BOM used in manufacturing uses all RoHS-compliant components.

 2013 Microchip Technology Inc. DS50002111A-page 21

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Corporate Office

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Chandler, AZ 85224-6199
Tel: [phone]
Fax: [phone]
Technical Support:

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Web Address:

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Fax: [phone]

China - Shanghai

Tel: [phone]
Fax: [phone]

China - Shenyang

Tel: [phone]
Fax: [phone]

China - Shenzhen

Tel: [phone]
Fax: [phone]

China - Wuhan

Tel: [phone]
Fax: [phone]

China - Xian

Tel: [phone]
Fax: [phone]

China - Xiamen

Tel: [phone]
Fax: [phone]

China - Zhuhai

Tel: [phone]
Fax: [phone]

ASIA/PACIFIC

India - Bangalore

Tel: [phone]
Fax: [phone]

India - New Delhi

Tel: [phone]
Fax: [phone]

India - Pune

Tel: [phone]

Japan - Osaka

Tel: [phone]
Fax: [phone]

Japan - Tokyo

Tel: [phone]
Fax: [phone]

Korea - Daegu

Tel: [phone]
Fax: [phone]

Korea - Seoul

Tel: [phone]
Fax: [phone] or
82-2-558-5934

Malaysia - Kuala Lumpur

Tel: [phone]
Fax: [phone]

Malaysia - Penang

Tel: [phone]
Fax: [phone]

Philippines - Manila

Tel: [phone]
Fax: [phone]

Singapore

Tel: [phone]
Fax: [phone]

Tai wan - Hsin Chu

Tel: [phone]
Fax: [phone]

Taiwan - Kaohsiung

Tel: [phone]

Taiwan - Taipei

Tel: [phone]
Fax: [phone]

Thailand - Bangkok

Tel: [phone]
Fax: [phone]

EUROPE

Austria - Wels

Tel: [phone]
Fax: [phone]

Denmark - Copenhagen

Tel: [phone]
Fax: [phone]

France - Paris

Tel: [phone]
Fax: [phone]

Germany - Dusseldorf

Tel: [phone]

Germany - Munich

Tel: [phone]
Fax: [phone]

Germany - Pforzheim

Tel: [phone]

Italy - Milan

Tel: [phone]
Fax: [phone]

Italy - Venice

Tel: [phone]

Netherlands - Drunen

Tel: [phone]
Fax: [phone]

Poland - Wars a w

Tel: [phone]

Spain - Madrid

Tel: [phone]
Fax: [phone]

Sweden - Stockholm

Tel: [phone]

UK - Wokingham

Tel: [phone]
Fax: [phone]

10/28/13

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