MCP1642B/D
High-Current
Synchronous Boost Converter
Evaluation Board
User’s Guide
2015 Microchip Technology Inc.
DS50002353A
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ISBN: 978-1-63277-200-8
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DS50002353A-page 2
Microchip received ISO/TS-16949:2009 certification for its worldwide
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2015 Microchip Technology Inc.
Object of Declaration: MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board
2015 Microchip Technology Inc.
DS50002353A-page 3
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
NOTES:
DS50002353A-page 4
2015 Microchip Technology Inc.
MCP1642B/D HIGH-CURRENT
SYNCHRONOUS BOOST 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 MCP1642B/D short overview ....................................................................... 11
1.3 What is the MCP1642B/D High-Current Synchronous Boost Converter
Evaluation Board? .................................................................................. 12
1.4 Contents of the MCP1642B/D High-Current Synchronous Boost Converter
Evaluation Board .................................................................................... 12
Chapter 2. Installation and Operation
2.1 Introduction ................................................................................................... 13
2.1.1 Battery Considerations .............................................................................. 14
2.1.2 MCP1642B/D High-Current Synchronous Boost Converter Evaluation
Board Features ...................................................................................... 14
2.2 Getting Started ............................................................................................. 16
2.2.1 Power Input and Output Connection ......................................................... 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 ....................................................................... 22
A.5 Board – Top Copper .................................................................................... 23
A.6 Board – Bottom Copper ............................................................................... 24
Appendix B. Bill of Materials (BOM)
Worldwide Sales and Service .................................................................................... 27
2015 Microchip Technology Inc.
DS50002353A-page 5
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
NOTES:
DS50002353A-page 6
2015 Microchip Technology Inc.
MCP1642B/D HIGH-CURRENT
SYNCHRONOUS BOOST 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 page 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® IDE online help.
Select the Help menu, and then Topics to open a list of available online help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP1642B/D High-Current Synchronous Boost 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 MCP1642B/D High-Current Synchronous
Boost Converter Evaluation Board as a development tool. The manual layout is as
follows:
• Chapter 1. “Product Overview” – Important information about the MCP1642B/D
High-Current Synchronous Boost 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 MCP1642B/D High-Current Synchronous Boost Converter
Evaluation Board.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board.
2015 Microchip Technology Inc.
DS50002353A-page 7
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
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
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
Represents code supplied by
user
DS50002353A-page 8
Examples
File>Save
Press <Enter>, <F1>
#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}
var_name [,
var_name...]
void main (void)
{ ...
}
2015 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user’s guide describes how to use the MCP1642B/D High-Current Synchronous
Boost Converter 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 Synchronous Boost Regulator” (DS20005253)
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://www.microchip.com/support.
DOCUMENT REVISION HISTORY
Revision A (March 2015)
• Initial Release of this Document.
2015 Microchip Technology Inc.
DS50002353A-page 9
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
NOTES:
DS50002353A-page 10
2015 Microchip Technology Inc.
MCP1642B/D HIGH-CURRENT
SYNCHRONOUS BOOST CONVERTER
EVALUATION BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP1642B/D High-Current Synchronous
Boost Converter Evaluation Board and covers the following topics:
• MCP1642B/D Device overview.
• What is the MCP1642B/D High-Current Synchronous Boost Converter Evaluation
Board?
• Contents of the MCP1642B/D High-Current Synchronous Boost Converter
Evaluation Board.
1.2
MCP1642B/D DEVICE 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, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.
The MCP1642B/D operates in Pulse-Width Modulation (PWM), at a fixed 1 MHz
switching frequency, has a wide input voltage range, from 0.35 to 5.5V (with typically
0.65V start-up voltage at 1 mA load current).
The device is available in an 8-Lead MSOP package and an 8-Lead 2 x 3 mm DFN
package. Also, there are two shutdown options for the MCP1642B/D family:
• Output Disconnect mode (MCP1642B)
• Input-to-Output Bypass mode (MCP1642D)
For the fixed output voltage option of the MCP1642B/D devices, the feedback pin (VFB)
is not connected. The output voltage is set by an internal feedback divider. The
available fixed output values are 1.8V, 3.0V, 3.3V, 5V.
TABLE 1-1:
PART NUMBER SELECTION BY SHUTDOWN OPTION
Part Number
True Output Disconnect
Input to output bypass
MCP1642B-ADJ
(or -18; 30; 33; 50)
X
—
MCP1642D-ADJ
(or -18; 30; 33; 50)
—
X
On the MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board,
the following options are used:
• MCP1642D-33 in DFN-8 package
• MCP1642B-ADJ in MSOP-8 package
The goal of the MCP1642B/D High-Current Synchronous Boost Converter Evaluation
Board is to demonstrate the high output current capabilities of the MCP1642B/D
devices.
2015 Microchip Technology Inc.
DS50002353A-page 11
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
L1
4.7 µH
VIN
0.9V - 1.8V
SW V
OUT
VIN
+
NC
CIN
10 µF
ON
OFF
FIGURE 1-1:
1.3
PG
EN
VOUT
3.3V @ 150 - 600 mA
536 kΩ
COUT
10 µF
VFB
309 kΩ
GND
Typical MCP1642B/D Boost Converter Single Cell Battery Input.
WHAT IS THE MCP1642B/D HIGH-CURRENT SYNCHRONOUS BOOST
CONVERTER EVALUATION BOARD?
The MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board is
used to evaluate and demonstrate Microchip’s MCP1642B/D products. The board can
be used to evaluate both package options (MSOP-8 and 2 x 3 mm DFN-8). The
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board was
developed to help engineers reduce the product design cycle time.
The output voltage for the applications using MCP1642B/D-ADJ can be set using the
external resistor divider.
The converter can be disabled by tying the Enable pin (EN) to ground (GND).
When disabled:
• MCP1642B disconnects the path from input to output for “true-disconnect”.
• MCP1642D connects the input to the output, using the internal P-Channel
MOSFET. During the bypass operation, the P-Channel current limit is disabled,
and the load current should be kept below 800 mA.
When enabled, the MCP1642B/D will regulate the output voltage.
1.4
CONTENTS OF THE MCP1642B/D HIGH-CURRENT SYNCHRONOUS BOOST
CONVERTER EVALUATION BOARD
The MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board
includes:
• MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board
(ADM00460)
• Information Sheet
DS50002353A-page 12
2015 Microchip Technology Inc.
MCP1642B/D HIGH-CURRENT
SYNCHRONOUS BOOST CONVERTER
EVALUATION BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1642B/D are compact, high-efficiency, fixed frequency, synchronous step-up
DC-DC converters. These products provide an easy-to-use power supply solution for
applications powered by either one-cell, two-cell or three-cell alkaline, NiCd, NiMH,
one-cell Li-Ion or Li-Polymer batteries.
The MCP1642B/D is capable of regulating the output voltage over a wide 1.8V to 5.5V
range and typically can deliver over 400 mA of load current at 3.3V output when
supplied from a single 1.5V cell. The regulated output voltage, VOUT, should be greater
than the input voltage, VIN.
The devices are available in MSOP-8 and 2 x 3 mm DFN-8 lead packages.
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board offers
both package types in two boost-converter applications for 3.3V and 5.0V output
voltage.
1400
1200
VOUT = 3.3V
IOUT (mA)
1000
VOUT = 5.0V
800
600
400
TA = 25°C
200
0
0.8
1.2
1.6
2
2.4
2.8
3.2
3.6
4
4.4
VIN (V)
Note:
Measurements were obtained using power supply.
FIGURE 2-1:
MCP1642B/D Maximum IOUT Vs. VIN with Maximum 10% Output Drop.
2015 Microchip Technology Inc.
DS50002353A-page 13
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
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 delivers good performance in a variety of applications. Energizer® Ultimate Lithium batteries are an 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.
2.1.2
MCP1642B/D High-Current Synchronous Boost Converter
Evaluation Board Features
The MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board has
the following features:
• Start-up voltage: 0.65V at VOUT = 3.3V and IOUT = 1mA, resistive load
• Input voltage range after start-up, VIN: 0.35V up to VOUT – 200-300 mV
recommended headroom
• Adjustable output voltage range: 1.8V to 5.5V, set by a resistor divider on board
(bottom application using MCP1642B-ADJ)
• Fixed 3.3V output voltage (using the fixed output voltage MCP1642D-33)
• Output current: typical 200 mA @ 3.3V Output, 1.2V Input or 800 mA @ 5.0V
Output, 3V Input
• Output Disconnect (MCP1642B)
• Input-Output Bypass (MCP1642D)
• PWM Operation
• PWM Switching Frequency = 1 MHz
• Enable state, Power Good, Switch test points on board
• Peak Input Current Limit of 1.8A
• Overtemperature protection (if the die temperature exceeds +150°C, +35°C
hysteresis)
DS50002353A-page 14
2015 Microchip Technology Inc.
Installation and Operation
L1
4.7 µH
VOUT
3.3V
VIN
1V - 3.0V
+
-
VIN
CIN
10 µF
JEN
EN
SELECT
MCP1642D-33
SW V
OUT
VFB
+
COUT
10 µF
NC
-
PG NC
GND
L1
4.7 µH
VOUT
5.0V
VIN
1 - 4.5V
+
-
VIN
CIN
10 µF
JEN
EN
SELECT
MCP1642B-ADJ
SW V
OUT
+
RT
976 kΩ
VFB
RB
RPG
5.1 kΩ
COUT
10 µF
-
309 kΩ
PG
GND
FIGURE 2-2:
MCP1642B/D Synchronous Boost Applications.
2015 Microchip Technology Inc.
DS50002353A-page 15
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
2.2
GETTING STARTED
The MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board is
fully assembled and tested to evaluate and demonstrate the MCP1642B/D Switching
Boost Regulators. For in-depth evaluation, this board requires the use of external lab
supplies and load.
2.2.1
Power Input and Output Connection
2.2.1.1
POWERING THE MCP1642B/D HIGH-CURRENT SYNCHRONOUS
BOOST CONVERTER EVALUATION BOARD
Soldered test points are available for input voltage connections. The maximum input
voltage should not exceed the output voltage. The output voltage will not remain in
regulation for input voltages that are greater than the output voltage.
The MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board has
two independent circuit applications, one using the MCP1642B-ADJ MSOP-8 package,
while the other one uses the MCP1642D-33 DFN-8 package.
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 converters
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
1. Connect the power supply/battery as shown in Figure 2-3. The positive terminal
must be connected to VIN and the negative terminal to GND.
2. The enable pin (EN) is by default connected to VIN and, in this situation the
converter is enabled and the output voltage can be measured on the VOUT and
GND terminals. To put the device in Shutdown mode, connect the EN pin to
GND, by putting the jumper on the first two pins of J9 and J10, respectively.
3. Connect system load to VOUT and GND terminals; maximum load varies with
input and output voltage. Connect the (+) side of the load to VOUT and the
negative (-) load to ground (GND).
4. Additional test points are available to visualize different signals (SW, PG, EN).
A-Meter
Resistive
(165Ω/1W)
A-Meter
+
V-Meter
V-Meter
1.5V Cell/
Power Supply
Enable/Disable
Devices
Power Good
Test Point
FIGURE 2-3:
DS50002353A-page 16
SW
Test Point
MCP1642 Evaluation Board Setup.
2015 Microchip Technology Inc.
Installation and Operation
2.2.1.3
ADJUSTABLE VOUT SETTING
The resistor divider RT and RB is used to set the converter output voltage. The output
voltage can be calculated using Equation 2-1.
EQUATION 2-1:
VOUT
R T = R B ------------- – 1
V FB
Where: VFB = 1.21V
2015 Microchip Technology Inc.
DS50002353A-page 17
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
NOTES:
DS50002353A-page 18
2015 Microchip Technology Inc.
MCP1642B/D HIGH-CURRENT
SYNCHRONOUS BOOST CONVERTER
EVALUATION BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP1642
High-Current Low Start-up Voltage Synchronous Boost Converter Evaluation Board:
•
•
•
•
•
Board – Schematic
Board – Top Silk and Pads
Board – Top Copper and Silk
Board – Top Copper
Board – Bottom Copper
2015 Microchip Technology Inc.
DS50002353A-page 19
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
A.2
BOARD – SCHEMATIC
SW1
L1
4.7uH
CIN1
10uF
10V
0805
1
EN
3
PG
J9
VOUT
VFB
J1
1
VIN
3.3V
4
2
COUT1
MCP1642B-33
MCP1642D-33
10uF
10V
0805
J3
1
1
J4
U1
7
SGND
6
5
PGND SW
8
VIN1
3 2 1
1
J2
GND
GND
GND
GND
SW2
L2
5V
J5
CIN2
J10
5V
VIN
1
EN
3
PG
R3
5.1k
PG
VOUT
VFB
4
2
MCP1642B-ADJ
RT
976k
1%
COUT2
10uF
10V
0805
RB
J7
309k
1%
1
J8
10uF
10V
0805
U2
1
8
VIN2
3 2 1
1
J6
7
SGND
6
5
PGND SW
1
4.7uH
GND2
DS50002353A-page 20
GND2
GND2
GND2
GND2
2015 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP SILK AND PADS
2015 Microchip Technology Inc.
DS50002353A-page 21
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
A.4
BOARD – TOP COPPER AND SILK
DS50002353A-page 22
2015 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – TOP COPPER
2015 Microchip Technology Inc.
DS50002353A-page 23
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
A.6
BOARD – BOTTOM COPPER
DS50002353A-page 24
2015 Microchip Technology Inc.
MCP1642B/D HIGH-CURRENT
SYNCHRONOUS BOOST CONVERTER
EVALUATION BOARD USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1:
Qty.
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
4
Bump
Bumpon CYLINDRICAL
44X.20 White
3M
SJ-5003
4
CIN1, CIN2,
COUT1, COUT2
CAP CER 10 μF 10V 10%
X7R 0805
TDK Corporation
C2012X7R1A106K125AC
8
J1, J2, J3, J4, J5, CON TP LOOP Tin SMD
J6, J7, J8
Harwin Plc.
S1751-46R
2
J9, J10
CONN HDR Male 100 1x3POS VERT
FCI
68000-103HLF
2
JP1, JP2
MECH HW JUMPER
2.54 mm 1x2 Handle Gold
TE Connectivity, Ltd.
881545-2
2
L1, L2
INDUCTOR 4.7 μH 2A 20%
SMD XFL4020
Coilcraft
XFL4020-472MEB
1
PCB
MCP1642D/B – Printed
Circuit Board
Microchip Technology Inc.
104-10026
1
R3
RES 5.1 kΩ 1/10W 1% 0603
SMD
Panasonic® – ECG
ERJ-3EKF5101V
1
RB
RES 309 kΩ 1/10W 1% 0603
SMD
Panasonic – ECG
ERJ-3EKF3093V
1
RT
RES 976 kΩ 1/10W 1% 0603
SMD
Panasonic – ECG
ERJ-3EKF9763V
1
U1
MCHP ANALOG SWITCHER Microchip Technology Inc.
Boost 3.3V MCP1642D-DFN
MCP1642D-33I/MC
1
U2
MCHP ANALOG SWITCHER Microchip Technology Inc.
Boost 5.0V MCP1642B-ADJ
MCP1642B-ADJI/MS
Note:
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.
2015 Microchip Technology Inc.
DS50002353A-page 25
MCP1642B/D High-Current Synchronous Boost Converter Evaluation Board User’s Guide
NOTES:
DS50002353A-page 26
2015 Microchip Technology Inc.
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2015 Microchip Technology Inc.
DS50002353A-page 27