MCP16301
High Voltage Buck-Boost
Demo Board
User’s Guide
© 2012 Microchip Technology Inc.
DS52020A
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DS52020A-page 2
© 2012 Microchip Technology Inc.
MCP16301 HIGH VOLTAGE
BUCK-BOOST DEMO BOARD
USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 3
Introduction............................................................................................................ 3
Document Layout .................................................................................................. 3
Conventions Used in this Guide ............................................................................ 4
Recommended Reading........................................................................................ 5
The Microchip Web Site ........................................................................................ 5
Customer Support ................................................................................................. 5
Document Revision History ................................................................................... 5
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 7
1.2 MCP16301 Short Overview ............................................................................ 7
1.3 What is the MCP16301 High Voltage Buck-Boost Demo Board? .................. 8
1.4 MCP16301 High Voltage Buck-Boost Demo Board Kit Contents ................... 8
Chapter 1. Installation and Operation
1.1 Introduction ..................................................................................................... 9
1.2 Getting Started ............................................................................................. 10
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 13
A.2 Board – Schematic ....................................................................................... 14
A.3 Board – Top Layer ....................................................................................... 15
A.4 Board – Top Copper ................................................................................... 15
A.5 Board – Bottom Copper ............................................................................... 16
Appendix B. Bill of Materials
Worldwide Sales and Service .................................................................................... 18
© 2012 Microchip Technology Inc.
DS52020A-page 3
MCP16301 High Voltage Buck-Boost Demo Board User’s Guide
DS52020A-page 4
© 2012 Microchip Technology Inc.
MCP16301 HIGH VOLTAGE
BUCK-BOOST DEMO 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 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
MCP16301 High Voltage Buck-Boost Demo 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 MCP16301 High Voltage Buck-Boost Demo
Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP16301
High Voltage Buck-Boost Demo Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with the MCP16301 High Voltage Buck-Boost Demo Board and a
description of the user’s guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP16301 High Voltage Buck-Boost Demo Board.
• Appendix B. “Bill of Materials” – Lists the parts used to build the MCP16301
High Voltage Buck-Boost Demo Board.
© 2012 Microchip Technology Inc.
DS52020A-page 5
MCP16301 High Voltage Buck-Boost Demo 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
DS52020A-page 6
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)
{ ...
}
© 2012 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use the MCP16301 High Voltage Buck-Boost Demo
Board. Other useful documents are listed below. The following Microchip documents
are available and recommended as supplemental reference resources.
• MCP16301 Data Sheet – “High Voltage Input Integrated Switch Step-Down
Regulator” (DS25004)
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 (January 2012)
• Initial Release of this Document.
© 2012 Microchip Technology Inc.
DS52020A-page 7
MCP16301 High Voltage Buck-Boost Demo Board User’s Guide
NOTES:
DS52020A-page 8
© 2012 Microchip Technology Inc.
MCP16301 HIGH VOLTAGE
BUCK-BOOST DEMO BOARD
USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP16301 High Voltage Buck-Boost Demo
Board and covers the following topics:
• MCP16301 Short Overview
• What is the MCP16301 High Voltage Buck-Boost Demo Board?
• MCP16301 High Voltage Buck-Boost Demo Board Kit Contents
1.2
MCP16301 SHORT OVERVIEW
The MCP16301 is a highly integrated, high-efficiency, fixed frequency, step-down
DC-DC converter in a popular 6-pin SOT23 package that operates from input voltage
sources up to 30V. Integrated features include a high-side switch, fixed-frequency
peak-current mode control, internal compensation, peak current limit and over-temperature protection. Minimal external components are necessary to develop a complete
step-down DC-DC converter power supply.
High converter efficiency is achieved by integrating the current limited, low resistance,
high-speed N-Channel MOSFET and associated drive circuitry. High switching
frequency minimizes the size of external filtering components resulting in a small
solution size.
The MCP16301 can supply 600 mA of continuous current while regulating the output
voltage from 2.0V to 15V. An integrated high performance, peak-current mode
architecture keeps the output voltage tightly regulated, even during input voltage steps
and output current transient conditions that are common in power systems.
With the addition of a MOSFET driver, an external N-channel MOSFET and a second
Schottky diode, the MCP16301 can function properly as a buck-boost converter.
The capabilities of this buck-boost converter are an input voltage range of 5V to 30V,
an output voltage range of 2V to 30V and an output current dependent upon VIN. The
typical maximum output current for a 12V output can be seen in Figure 2-1: “Typical
Maximum Output Current vs. Input Voltage”.
© 2012 Microchip Technology Inc.
DS52020A-page 9
MCP16301 High Voltage Buck-Boost Demo Board User’s Guide
1N4148
VIN
5V to 30V
CBOOST
100 nF
47 μH
BOOST
VIN
7.5V
Zener
40V
Schottky
Diode
VOUT
12V
SW
EN
MCP16301
40V
Schottky
Diode
2.21 k
2.21 k
10 µF
FIGURE 1-1:
1.3
GND
VFB
MCP1402
MOSFET
Driver
140 k
GND
IN OUT
VIN
2x10 μF
10 k
Typical MCP16301 Buck-Boost Application.
WHAT IS THE MCP16301 HIGH VOLTAGE BUCK-BOOST DEMO BOARD?
The MCP16301 High Voltage Buck-Boost Demo Board is designed to operate from a
5V to 30V input and regulate the output to 12V. Test points for input power and load are
provided to demonstrate the capability of the demo board over the entire range. The
MCP16301 High Voltage Buck-Boost Demo Board was designed using small
surface-mount components to show application size for a high voltage buck-boost
design.
1.4
MCP16301 HIGH VOLTAGE BUCK-BOOST DEMO BOARD KIT CONTENTS
This MCP16301 High Voltage Buck-Boost Demo Board kit includes the following items:
• MCP16301 High Voltage Buck-Boost Demo Board, 102-00399
• Important Information Sheet
DS52020A-page 10
© 2012 Microchip Technology Inc.
MCP16301 HIGH VOLTAGE
BUCK-BOOST DEMO BOARD
USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
2.1.1
MCP16301 Features
The MCP16301 device has been developed to provide high input voltage applications
with a precise regulated rail while operating at high efficiency.
The key features of the MCP16301 include:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Up to 96% Typical Efficiency
Input Voltage Range: 4.0V to 30V
Output Voltage Range: 2.0V to 15V
2% Output Voltage Accuracy
Integrated N-Channel Switch: 460 mΩ
500 kHz Fixed Frequency
Adjustable Output Voltage
Low Device Shutdown Current
Peak Current Mode Control
Internal Compensation
Stable with Ceramic Capacitors
Internal Soft-Start
Cycle-by-Cycle Peak Current Limit
Under Voltage Lockout (UVLO): 3.5V
Overtemperature Protection
Available Package: SOT23-6
A high performance peak-current mode control system is used to deliver fast response
to sudden line and load changes.
2.1.1.1
MCP16301 HIGH VOLTAGE BUCK-BOOST DEMO BOARD FEATURES
The MCP16301 High Voltage Buck-Boost Demo Board is developed to demonstrate
how the MCP16301 device operates as a Buck-Boost topology over a wide input
voltage and load range. Test points are provided for input and output, allowing the
demo board to be connected directly to a system.
The MCP1402 Tiny 500 mA, High-Speed Power MOSFET Driver is utilized to drive the
external N-Channel MOSFET allowing the MCP16301 to buck and boost. The
maximum output current of the MCP16301 High Voltage Buck-Boost Demo Board is
dependent upon input voltage and inductance. The MCP16301 will regulate the output
to 12V until the peak current in the inductor reaches the maximum-rated value.
Figure 2-1 shows the typical maximum output current vs. input voltage for an output
voltage of 12V.
A copper via connected to the EN input can be used to turn the MCP16301 on and off.
Turning the device on (EN>1.4V) when the undervoltage lockout threshold is met
(VIN>3.5V), will enable the device.
© 2012 Microchip Technology Inc.
DS52020A-page 11
MCP16301 High Voltage Buck-Boost Demo Board User’s Guide
800
Maxim
mumOutputCurrent(mA)
700
600
VOUT =12V
500
400
300
200
100
0
5
7
9
11
13
15
17
19
21
23
25
27
29
InputVoltage(V)
FIGURE 2-1:
2.2
Typical Maximum Output Current vs. Input Voltage
GETTING STARTED
The MCP16301 High Voltage Buck-Boost Demo Board is fully assembled and tested
to evaluate and demonstrate the MCP16301 operation in a buck-boost topology.
2.2.1
Power Input and Output Connection
2.2.1.1
POWERING THE MCP16301 HIGH VOLTAGE BUCK-BOOST DEMO
BOARD
The MCP16301 High Voltage Buck-Boost Demo Board is fully assembled, tested and
ready to begin evaluation. Apply positive input voltage to the VIN terminal and its return
to the GND terminal. The maximum input voltage should not exceed 30V. An electronic
load or resistive load can be used for evaluation or the intended system load can be
connected. Electronic loads attempt to sink current at 0V during startup, a resistive load
or constant resistance is recommended for startup evaluation. Connect the positive
voltage terminal of the load to the VOUT terminal on the demo board and connect the
negative or return side of the load to the GND terminal.
2.2.1.2
BOARD TESTING
To test the board, follow the next steps:
1. Apply input voltage.
2. An internal pull up resistor is connected from VIN to the EN input of the
MCP16301, once the input voltage is greater than 3.5V the device will begin to
switch. Apply greater than 5V to the input for proper operation, a minimum load
is required to regulate the output to 12V. Detailed information is provided in the
MCP16301 data sheet (DS25004) for minimum load requirements for light load
conditions.
3. The measured output voltage should be 12V typical, 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.
DS52020A-page 12
© 2012 Microchip Technology Inc.
Installation and Operation
2.2.1.3
HOW THE MCP16301 HIGH SIDE DRIVE BOOST CIRCUIT OPERATES
The MCP16301 integrates a low resistance N-Channel MOSFET. A high side or
floating supply is needed to drive the gate of the N-Channel MOSFET above the input
voltage to turn it on. The demo board uses the output voltage and a 7.5V zener diode
to charge the boost cap while the inductor current flows, clamping the SW node to a
diode drop below ground. Prior to startup, there is no inductor current, so an internal
precharge circuit charges the boost cap up to a minimum threshold. Once charged, the
N-Channel can be turned on, ramping current into the inductor.
The worst case operating conditions, for charging the boost capacitor, occur at
minimum VIN and no load. At minimum VIN (5V), there is not enough head room to
precharge the boost cap to a satisfactory value. At no load, the converter is operating
at a minimum or very low duty cycle, putting a small amount of current into the inductor.
When the switch turns off, the inductor current decays very quickly, resulting in a short
time to recharge the boost capacitor.
© 2012 Microchip Technology Inc.
DS52020A-page 13
MCP16301 High Voltage Buck-Boost Demo Board User’s Guide
NOTES:
DS52020A-page 14
© 2012 Microchip Technology Inc.
MCP16301 HIGH VOLTAGE
BUCK-BOOST DEMO BOARD
USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP16301 High
Voltage Buck-Boost Demo Board:
•
•
•
•
Board – Schematic
Board – Top Layer
Board – Top Copper Layer
Board – Bottom Copper Layer
© 2012 Microchip Technology Inc.
DS52020A-page 15
MCP16301 High Voltage Buck-Boost Demo Board User’s Guide
BOARD – SCHEMATIC
DS52020A-page 16
2
1
1
3
2
2
1
A.2
© 2012 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP LAYER
A.4
BOARD – TOP COPPER
© 2012 Microchip Technology Inc.
DS52020A-page 17
MCP16301 High Voltage Buck-Boost Demo Board User’s Guide
A.5
BOARD – BOTTOM COPPER
DS52020A-page 18
© 2012 Microchip Technology Inc.
MCP16301 HIGH VOLTAGE
BUCK-BOOST DEMO BOARD
USER’S GUIDE
Appendix B. Bill of Materials
TABLE B-1:
BILL OF MATERIALS (BOM)
Qty Reference
4
Description
Manufacturer
Part Number
BUMPON SQUARE .40X.10 BLACK
3M
SJ5007-0-ND
Microchip Technology Inc. 104-00399
1
–
RoHS Compliant Bare PCB, MCP16301
Buck-Boost
2
C1; C2
CAP 4.7uF 50V CERAMIC X7R 1210 10% Taiyo Yuden Co., Ltd.
587-2673-2-ND
2
C3;C4
CAP CER 10uF 16V X5R 0805
TDK Corporation
445-4115-1-ND
1
C5
CAP 0.1uF 16V CERAMIC X7R 0603 10% AVX Corporation
478-1239-1-ND
1
C6
Not Installed. Do not populate.
–
–
1
D1; D2
DIODE SCHOTTKY 40V 1A SMA
Diodes Incorporated®
B140-FDICT-ND
1
D3
DIODE SWITCH 75V 200MW SOD-323
Diodes Incorporated
1N4448WS-FDICT-ND
1
D4
DIODE ZENER 7.5V 200MW SOD323
Diodes Incorporated
BZT52C7V5S-FDICT-ND
1
L1
MSS1038 47uH Shielded Power Inductor
Coilcraft
MSS1038-473ML
1
R1
RES 100K OHM 1/10W 1% 0603 SMD
Panasonic-ECG®
P100KHCT-ND
1
R2
RES 140K OHM 1/10W 1% 0603 SMD
Panasonic-ECG
P140KHCT-ND
1
R3
RES 10.0K OHM 1/10W 1% 0603 SMD
Panasonic-ECG
P10.0KHCT-ND
2
R4; R5
RES 2.21K OHM 1/4W 1% 1206 SMD
Panasonic-ECG
P2.21KFCT-ND
4
TP1;TP2;
TP3;TP4
PC TEST POINT TIN SMD
Harwin PLC.
952-1478-1-ND
1
U1
MCP16301 High Voltage Input Buck Converter SOT23
Microchip Technology Inc. MCP16301T-I/CHY
1
U2
MCP1402 Tiny 500 mA, High-Speed
Power MOSFET Driver
Microchip Technology Inc. MCP1402T-E/OT
1
U3
MOSFET N-CH 30V 2.7A SSOT3
Fairchild Semiconductor®
Note 1:
FDN359BNCT-ND
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.
© 2012 Microchip Technology Inc.
DS52020A-page 19
Worldwide Sales and Service
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://www.microchip.com/
support
Web Address:
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Fax: 86-28-8665-7889
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Fax: 86-23-8980-9500
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Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Hangzhou
Tel: 86-571-2819-3187
Fax: 86-571-2819-3189
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-330-9305
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
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 - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
DS52020A-page 20
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
11/29/11
© 2012 Microchip Technology Inc.