Microchip Technology MCP1642B, MCP1642D User Manual

MCP1642B/D

Two-Cell to USB Power

Evaluation Board

User’s Guide

 2014 Microchip Technology Inc. DS50002231A

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ISBN: 978-1-63276-904-6

EELOQ, KEELOQ logo, Kleer,

32

logo, RightT ouch, S pyNIC,

QUALITY MANAGEMENT S

DS50002231A-page 2  2014 Microchip Technology Inc.

Microchip received ISO/TS-16949:2009 certification for its worldwide
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and India. The Company’s quality system processes and procedures
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and manufacture of development systems is ISO 9001:2000 certified.

®

MCUs and dsPIC® DSCs, KEELOQ

®

code hopping

Object of Declaration: MCP1642B/D Two-Cell to USB Power Evaluation Board

 2014 Microchip Technology Inc. DS50002231A-page 3

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

NOTES:

DS50002231A-page 4  2014 Microchip Technology Inc.

MCP1642B/D TWO-CELL TO

USB POWER 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 MCP1642B/D Short Overview ......................................................................11

1.3 What is the MCP1642B/D Two-Cells to USB Power Evaluation Board? .....12

1.4 What the MCP1642B/D Two-Cells to USB Power

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

Chapter 2. Installation and Operation

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

2.2 Getting Sta rted ............................................................................................. 16

Appendix A. Schematic and Layouts

A.1 Introduction ..................................................................................................19

A.2 Board – Schematic ... .................................................................... ................ 20

A.3 Board – Top Silk and Pads ..........................................................................21

A.4 Board – Top Copper and Silk .......................................................................21

A.5 Board – Top Copper ....................................................................................22

A.6 Board – Bottom Copper ...............................................................................22

Appendix B. Bill of Materials (BOM)...........................................................................23

Worldwide Sales and Service ....................................................................................24

 2014 Microchip Technology Inc. DS50002231A-page 5

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

NOTES:

DS50002231A-page 6  2014 Microchip Technology Inc.

MCP1642B/D TWO-CELL TO

USB POWER 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
“DSXXXXXXXXA”, where “XXXXXXXX” 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
MCP1642B/D Two-Cell to USB Power 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 MCP1642B/D Two-Cell to USB Power
Evaluation Board as a development tool. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP1642B/D

Two-Cell to USB Power Evaluation Boa rd.

• 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 MCP1642B/D Two-Cell to USB Power Evaluation Board.

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP1642B/D Two-Cell to USB Power Evaluation Board.

 2014 Microchip Technology Inc. DS50002231A-page 7

MCP1642B/D Two-Cell to USB Power 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,

Te xt in angle brackets < > 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

DS50002231A-page 8  2014 Microchip Technology Inc.

RECOMMENDED READING

This user’s guide describes how to use MCP1642B/D Two-Cell to USB Power
Evaluation Board. Other useful documents are listed below. The following Microchip
documents are available and recommended as supplemental reference resources.

• MCP1642B/D Data Sheet – “1.8A Input Current Switch, 1 MHz Low-Voltage
Start-up Synchro nous Boost Regulator” (DS20005253)

• AN1311, Single Cell Input Boost Converter Design (DS01311)

This application note details how to use the MCP1642B/D device in specific
applications.

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 2014)

• Initial Release of this Document.

 2014 Microchip Technology Inc. DS50002231A-page 9

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

NOTES:

DS50002231A-page 10  2014 Microchip Technology Inc.

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP1642B/D Two-Cells to USB Power
Evaluation Board and covers the following topics:

• MCP1642B/D Short Overview

• What is the MCP1642B/D Two-Cells to USB Power Evaluation Board?

• What the MCP1642B/D Two-Cells to USB Power Evaluation Board Contains

1.2 MCP1642B/D SHORT OVERVIEW

The MCP1642B/D are compact, high-efficiency, fixed-frequency, step-up DC-DC con­verters. These products provide an easy-to-use power supply solution, with a minimum
number of external components for applications powered by one-cell, two-cell, or
three-cell alkaline, Ni-Cd, Ni-MH, one-cell Li-Ion or Li-Polymer batteries.

The MCP1642B/D devices operate in Pulse-Width Modulation (PWM), at a fixed 1 MHz
switching frequency, featuring Internal Compensation, Overtemperature Protection
and Power Good Open-Drain Output. The device has 1.8V start-up voltage at 5V output
and 1 mA load current.

There are two shutdown options for the MCP1642B/D family:

• True Output Disconnect mode (MCP1642B/D)

• Input-to-Output Bypass mode (MCP1642D)

For the fixed-output voltage option of the MCP1642B/D devices, the V
connected. The output voltage is set by an internal feedback divider. The fixed values
are: 1.8V, 3.0V, 3.3V, 5.0V (see Table 1-1).

On the MCP1642B/D Two-Cells to USB Power Evaluation Board, the fixed output
voltage version (MCP1642B/D-50) is used.

The goal of the MCP1642B/D Two-Cells to USB Power Evaluation Board is to
demonstrate the higher output current capabilities of the MCP1642B/D, supplied from
two AA batteries.

MCP1642B/D TWO-CELL TO

USB POWER EVALUATION

BOARD USER’S GUIDE

pin is not

FB

TABLE 1-1: PART NUMBER SELECTION BY SHUTDOWN OPTIONS

Part Number True Output Disconnect Input-to-Output Bypass

MCP1642B-ADJ
(or -18; 30; 33; 50)

MCP1642D-ADJ
(or -18; 30; 33; 50)

 2014 Microchip Technology Inc. DS50002231A-page 11

X—

—X

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

V

IN

EN

GND

V

FB

SW

VIN

1.8V to 3.6V

V

OUT

5V @ 400 to 700 mA

C

OUT

10 µF

C

IN

10 µF

L

1

4.7 µH

V

OUT

+

976 k

309

k

+

-

OFF

ON

PG

NC

-

FIGURE 1-1: Typical MCP1642B/D-ADJ Boost Converter Two Cells Battery Input.

1.3 WHAT IS THE MCP1642B/D TWO-CELLS TO USB POWER EVALUATION BOARD?

The MCP1642B/D Two-Cells to USB Power Evaluation Board is used to evaluate and
demonstrate Microchip T echnology’s MCP1642B/D/D Switching Boost Regulator. This
board demonstrates the MCP1642B/D capabilities in a boost-converter application
supplied from two AA batteries or from an external voltage source. A USB cable can be
connected to the output of MCP1642B/D Two-Cells to USB Power Evaluation Board
and used to provide power to portable electronic devices when necessary. It can be
used to evaluate the MSOP-8 package. The MCP1642B/D Two-Cells to USB Power
Evaluation Board was developed to help engineers reduce the product design cycle
time.

On the MCP1642B/D Two-Cells to USB Power Evaluation Board, the output voltage
has the value of 5.0V (the fixed value MCP1642B/D-50 device is used), resulting in a
simple and compact application. The footprints for RT and RB (resistor divider
connected to the FB pin) are not populated and will only be used if MCP1642B/D-ADJ,
the adjustable option, will be tested.

An enable (EN Switch selection) is used to enable and disable the converter. When
enabled, the MCP1642B/D will regulate the output voltage; when disabled, the
MCP1642B/D will disconnect the path from input to output for “true-disconnect”.

1.4 WHAT THE MCP1642B/D TWO-CELLS TO USB POWER EVALUATION

DS50002231A-page 12  2014 Microchip Technology Inc.

This MCP1642B/D Two-Cells to USB Power Evaluation Board kit includes:

• MCP1642B/D Two-Cells to USB Power Evaluation Board (ADM00556)

• Important Information Sheet

BOARD CONTAINS

Chapter 2. Installation and Operation

0

200

400

600

800

1.8 2.2 2.6 3 3.4

OUT

V

OUT

= 5.0V

TA= 25°C

2.1 INTRODUCTION

The MCP1642B/D has been developed for applications that require higher output
current capabilities (see Figure 2-1) and low output ripple. It is a compact,
synchronous, fixed-frequency step-up DC-DC converter. The regulated output voltage
(V

) should be greater than the input voltage (VIN). Another important feature is that

OUT

the device integrates the compensation and protection circuitry, such that the final
solution requires a minimum number of additional components. The device can be
disabled using the EN switch. The true disconnect option, MCP1642B/D, removes the
normal boost topology path from input to output.

1000

MCP1642B/D TWO-CELL TO

USB POWER EVALUATION

BOARD USER’S GUIDE

(mA)

I

VIN(V)

FIGURE 2-1: MCP1642B/D - 5.0 V
Supply.

Maximum I

OUT

vs. VIN Using Power

OUT

 2014 Microchip Technology Inc. DS50002231A-page 13

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

0.0

5.0

10.0

15.0

20.0

25.0

30.0

Service Estimate (hours)

Energizer®Max®AA

Note: Service estimates apply to using two Energizer MAX AA or Energizer

Ultimate Lithium AA batteries as the power source. Note that, if PG or
feedback divider network is used, some additional input drain current
should be included, but there will be negligible effects on the service
estimates at these three load currents.

2.1.1 Battery Considerations

When considering a power solution for a design, the battery needs to be carefully
selected. Alkaline batteries are a commonly available option that deliver good
performance in a variety of applications. Energizer
alternative power solution that provides superior performance high drains and allows
designers to utilize the full power range of the MCP1642B/D without sacrificing size or
runtime.

Energizer Ultimate Lithium batteries utilize a primary cell chemistry that contains higher
energy than alkaline batteries, and has much better high-drain performance. Ultimate
Lithium batteries produce a high, flat voltage profile that enables them to provide a high

-energy capacity even at high drains. Additionally, Ultimate Lithium batteries have a
very low internal resistance, allowing them to maintain a high voltage at very high loads.

28.7

®

Ultimate Lithium batteries are an

Energizer® MAX® AA
Energizer® Ultimate Lithium AA

Energizer®Ultimate Lithium AA

12.7

5.8

1.8

50 mA 250 mA 500 mA

Constant Output Current with 5V DC V

FIGURE 2-2: MCP1642B/D Run Time Estimate Using Two

or Energizer Ultimate Lithium

at Different Loads.

2.3

0.3

OUT

Energizer MAX AA

DS50002231A-page 14  2014 Microchip Technology Inc.

Installation and Operation

V

IN

EN

GND

V

FB

SW

V

IN

1.8V to 3.6V

V

OUT

5V @ 400 to 700 mA

C

OUT

10 µF

C

IN

10 µF

L

1

4.7 µH

V

OUT

976 k

309 k

USB

D­D+

+

-

+

-

1M

Output to

USB Connector

PG

1.5 k
LED

15 k

15 k

1. The resistor divider is not populated. In case that another output voltage is desired,
MCP1642B/D-ADJ should be used. The output voltage can be set according to Equation 2-1.

(1)

R

EN

EN

R

T

R

B

R

PG

R

1

R

2

2.1.2 MCP1642B/D Two-Cells to USB Power Evaluation Board
Features

The MCP1642B/D Two-Cells to USB Power Evaluation Board has the following
features:

• It can be powered by two AA batteries or external power supply

• Input voltage range (V

• Minimum start-up voltage: 1.8V at V

• Output voltage: 5.0V

• Output current: typical 700 mA @ 5V output, 2.8V input

• PWM operation

• PWM switching frequency : 1 MHz

• Power Good indicator 2 mA LED

• Enable state selectable using EN switch

• Peak input current limit of 1.8A

• Overtemperature protection (if the die temperature exceeds +150°C, with 35°C

hysteresis)

• USB A output connector

): 1.8V to 5.5V, with V

IN

= 5.0V and I

OUT

IN

 V

OUT

= 1 mA, resistive load

OUT

FIGURE 2-3: Two Cells to 5.0V Synchronous Boost MSOP-8 Application.

 2014 Microchip Technology Inc. DS50002231A-page 15

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

V-meter

+

Electronic

Load/

Resistive

Load

-

V-meter

+

Power

Supply

-

2.2 GETTING STARTED

The MCP1642B/D Two-Cells to USB Power Evaluation Board is fully assembled and
tested to evaluate and demonstrate the MCP1642B/D Switching Boost Regulator in a
real world application. For in-depth evaluation, this board requires the use of external
laboratory supplies and load.

2.2.1 Power Input and Output Connection

2.2.1.1 POWERING MCP1642B/D TWO-CELLS TO USB POWER EVALUATION
BOARD

Two AA battery holder and soldered test points are available for input voltage
connections. The maximum input voltage should not exceed 5.5V. The output voltage
will not remain in regulation for input voltages that are greater than or equal to the
output voltage.

The MCP1642B/D Two-Cells to USB Power Evaluation Board was designed to be used
in the evaluation of the device. The package selected is MSOP-8.

USB A connector or soldered test points are available to connect a load. The switch
peak current limit will provide a safe maximum current value. The maximum output cur­rent for the converter will vary with input and output voltages; refer to Figure 2-1 or the
MCP1642B/D data sheet for more information on the maximum output current.

2.2.1.2 BOARD POWER-UP PROCEDURE:

2. Connect input supply as shown in Figure 2-4 or connect two AA batteries in the

battery holder on the bottom side of the board.

3. Connect system load to V

and GND terminals; maximum load varies with

OUT

input and output voltage; see the MCP1642B/D data sheet for more information
on the maximum load. Typically, the MCP1642B/D can supply a 5V output with
700 mA from a 2.8V input source at room temperature. Connect the (+) side of
the load to V

and the negative (-) load to ground (GND).

OUT

4. Turn the device ON/OFF using the EN switch.

5. When EN is ON or high, the converter is enabled, the Power Good Indicator PG

LED is turned ON and V
When EN is low, the converter is disabled, the PG indicator turns OFF, and V

can be measur ed on the V

OUT

and GND terminals.

OUT

OUT

is floating and is disconnected from the input.

Additional test points are available to visualize different signals (SW, PG, EN). The
MCP1642B/D Two-Cells to USB Power Evaluation Board is also equipped with a USB
A connector at the output. Using a USB B - micro/mini USB cable, the board can be
connected to portable electronic devices and used as an alternative power supply
when needed.

DS50002231A-page 16  2014 Microchip Technology Inc.

FIGURE 2-4: MCP1642B/D Two-Cells to USB Power Evaluation Board Setup.

Installation and Operation

R

T

R

B

V

OUT

V

FB

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





1–



=

Where: V

FB

= 1.21V for MCP1642B/D-ADJ

2.2.1.3 ADJUSTABLE V
The board comes with the fixed output value MCP1642B/D-50 option (V

set to 5.0V). If a different output voltage is desired, the MCP1642B/D-ADJ adjustable
option can be used. In this case, the resistor divider consisting of R
set the converter output voltage. The value of the resistors can be calculated using

Equation 2-1.

EQUATION 2-1:

SETTING

OUT

internally

OUT

and RB is used to

T

 2014 Microchip Technology Inc. DS50002231A-page 17

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

NOTES:

DS50002231A-page 18  2014 Microchip Technology Inc.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP1642B/D
Two-Cell to USB Power Evaluation Board User’s Guide:

• Board – Schematic

• Board – Top Silk and Pads

• Board – Top Copper and Silk

• Board – Top Copper

• Board – Bottom Copper

MCP1642B/D TWO-CELL TO

USB POWER EVALUATION

BOARD USER’S GUIDE

 2014 Microchip Technology Inc. DS50002231A-page 19

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

VIN8SW

5

VOUT

4PG3

EN

1

SGND

7

VFB

2

PGND

6

U1

MCP1642B-50

GND

GND

GNDGND

GND

SW

POWER GOOD

12

+

-

+

-

BT1

Vout

Vin

1

J2

1

J3

1

J4

1

J5

VBUS1GND

4

2

3

0

J1

GND

SW1

976k

RT

309k

RB

1.5k

RPG

4.7uH

L1

10uF

CIN

10uF

COUT

GND GND

15k

R1

15k

R2

1M

R3

GND

RED

LD1

GND

EN

VBUSD-GND

D+

*Note

Note: Do NOT populate unless MCP1642B/D-ADJ is

A.2 BOARD – SCHEMATIC

DS50002231A-page 20  2014 Microchip Technology Inc.

A.3 BOARD – TOP SILK AND PADS

Schematic and Layouts

A.4 BOARD – TOP COPPER AND SILK

 2014 Microchip Technology Inc. DS50002231A-page 21

MCP1642B/D Two-Cell to USB Power Evaluation Board User’s Guide

A.5 BOARD – TOP COPPER

A.6 BOARD – BOTTOM COPPER

DS50002231A-page 22  2014 Microchip Technology Inc.

MCP1642B/D TWO-CELL

TO USB POWER EVALUA-

TION BOARD USER ’S

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty. Reference Description Manufacturer Part Number

1 U1 IC conv. DC-DC stepup sync. MSOP-8 Microchip Technology

Inc.
1 Tape VHB white 3/4" low surface 3M 3/4-5-4932
1 BT1 Holder battery 2-cell AA PC mount Keystone Electronics

Corp.
2 CIN, COUT Cap. ceramic 10 µF 6.3V 10% X7R SMD

0805

1 J1 Conn. rcpt. USB Type A R/A SMD Wurth Elektronik

4 J2, J3, J4, J5 Conn. TP loop tin SMD Harwin Plc. S1751-46R
1 L1 In ductor 4.7µH 2A 20% SMD XFL4020 Coilcraft XFL4020-472MEB
1 LD1 Diode LED red 2V 30mA SMD 0603 Wurth Elektronik

0 PCB Printed Circuit Board – MCP1642B/D

Two-Cell to USB Power

Evaluation Board
2 R1,R2 Res. 15k 1% 1/8W SMD 0805 Samsung RC2012F153CS
1 R3 Res. 1M 1% 1/8W SMD 0805 Vishay/Dale CRCW08051M00FKEA
1 RPG Res. 1.5k 1% 1/8W SMD 0805 Vishay/Dale CRCW08051K50FKEA
1 SW1 Switch sp st. 24V 25 mA 418121270801

SMD
1RB DO NOT POPULATE

Res. 309k 1% 1/8W SMD 0805
1RT DO NOT POPULATE

Res. 976k 1% 1/8W SMD 0805

Note 1: 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.

TDK Corporation CGA4J1X7R0J106K125AC

Group

Group
Microchip Technology

Inc.

Wurth Elektronik
Group

Panasonic

Panasonic

®

®

MCP1642B-50I/MS

2462

62900416021

150060RS75000

104-00556

418121270801

ERJ-6ENF3093V

ERJ-6ENF9763V

 2014 Microchip Technology Inc. DS50002231A-page 23

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