MCP19035
600 kHz High-Voltage
Synchronous Buck Controller
Reference Design
User’s Guide
2014 Microchip Technology Inc.
DS50002228A
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DS50002228A-page 2
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2014 Microchip Technology Inc.
Object of Declaration: MCP19035 600 kHz High-Voltage Synchronous Buck Controller
Reference Design User’s Guide
2014 Microchip Technology Inc.
DS50002228A-page 3
MCP19035 600 kHz HIGH-VOLTAGE
SYNCHRONOUS BUCK CONTROLLER
REFERENCE DESIGN USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 5
Introduction............................................................................................................ 5
Document Layout .................................................................................................. 5
Conventions Used in this Guide ............................................................................ 6
Recommended Reading........................................................................................ 7
The Microchip Web Site ........................................................................................ 7
Customer Support ................................................................................................. 7
Document Revision History ................................................................................... 7
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 8
1.2 MCP19035 Short Overview ............................................................................ 8
1.3 What Is the MCP19035 600 kHz High-Voltage Synchronous Buck
Controller Reference Design? .................................................................. 9
1.4 What the MCP19035 600 kHz High-Voltage Synchronous Buck
Controller Reference Design Kit Contains ................................................ 9
Chapter 2. Installation and Operation
2.1 Introduction ................................................................................................... 10
2.2 Getting Started ............................................................................................. 10
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 13
A.2 Board – Schematic ....................................................................................... 14
A.3 Board – Top Silk .......................................................................................... 15
A.4 Board – Top Silk And Copper ...................................................................... 16
A.5 Board – Bottom Copper ............................................................................... 17
A.6 Board – Bottom Copper and Silk ................................................................. 18
Appendix B. Bill of Materials (BOM)
Appendix C. Typical Performance Data, Curves and Waveforms
C.1 Introduction .................................................................................................. 20
Worldwide Sales and Service .................................................................................... 24
DS50002228A-page 4
2014 Microchip Technology Inc.
MCP19035 600 kHz HIGH-VOLTAGE
SYNCHRONOUS BUCK CONTROLLER
REFERENCE DESIGN 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
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design.
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 MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design 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 MCP19035
600 kHz High-Voltage Synchronous Buck Controller Reference Design.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with the MCP19035 600 kHz High-Voltage Synchronous Buck Controller
Reference Design and a description of the user’s guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP19035 600 kHz High-Voltage Synchronous Buck Controller
Reference Design.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference
Design.
• Appendix C. “Typical Performance Data, Curves and Waveforms” – Lists the
typical performance data, curves and waveforms.
2014 Microchip Technology Inc.
DS50002228A-page 5
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design 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
DS50002228A-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)
{ ...
}
2014 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use the MCP19035 600 kHz High-Voltage
Synchronous Buck Controller Reference Design. Other useful documents are listed
below. The following Microchip documents are available and recommended as
supplemental reference resources.
• MCP19035 Data Sheet – “High-Speed Synchronous Buck Controller”
(DS22326)
• AN1452 – “Using the MCP19035 Synchronous Buck Converter Design Tool”
(DS01452)
• MCP19035 Excel-based Design Analyzer
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 (July 2014)
• Initial Release of this Document.
2014 Microchip Technology Inc.
DS50002228A-page 7
MCP19035 600 kHz HIGH-VOLTAGE
SYNCHRONOUS BUCK CONTROLLER
REFERENCE DESIGN USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP19035 600 kHz High-Voltage
Synchronous Buck Controller Reference Design and covers the following topics:
• MCP19035 Short Overview
• What Is the MCP19035 600 kHz High-Voltage Synchronous Buck Controller
Reference Design?
• What the MCP19035 600 kHz High-Voltage Synchronous Buck Controller
Reference Design Kit Contains
1.2
MCP19035 SHORT OVERVIEW
The MCP19035 is a highly-featured, highly-integrated, synchronous buck controller in
a space-saving 10-pin DFN 3x3 package that operates from input voltage sources up
to 30V. Integrated features include high and low-side MOSFET drivers, fixed-frequency
voltage mode control, internal oscillator and reference voltage generator, overcurrent
protection circuit for both sides, Power Good circuit and overtemperature protection.
A minimal number of external components are necessary to develop a complete,
high-performance Synchronous Buck Converter power supply.
The MCP19035 Synchronous Buck Controller is intended to be used for applications
requiring medium to high-output currents (up to 20A) and input voltages up to 30V.
Typical applications includes:
•
•
•
•
•
•
Medium currents Point-of-Load converters
FPGA/DSP power supplies
USB power ports
Digital Set-Top boxes
Industrial 24V rail converters
High-power LED drivers
The internal linear voltage regulator (LDO) allows low current loads (i.e., PIC®
microcontrollers) to be powered directly from the controller without any additional
components.
DS50002228A-page 8
2014 Microchip Technology Inc.
Product Overview
+VIN
CIN
ON
MCP19035
SHDN
OFF
BOOT
CBOOT
VIN
Q1
HDRV
L
PWRGD
C2
PHASE
COMP
LDRV
FB
+VCC
+VOUT
Q2
COUT
CVCC
C3
R4
R1
C1
R3
R2
FIGURE 1-1:
1.3
MCP19035 – Typical Application.
WHAT IS THE MCP19035 600 kHz HIGH-VOLTAGE SYNCHRONOUS BUCK
CONTROLLER REFERENCE DESIGN?
The MCP19035 600 kHz Synchronous Buck Converter Controller is a compact, highly
efficient, step-down voltage converter that will convert the input voltage rail (typically
24V) to 5V regulated output voltage. The maximum output current for this step-down
converter is 5A. The board demonstrates the capabilities of the MCP19035 600 kHz
Synchronous Buck Converter Controller in a typical high-voltage input step-down application. Test points for various signals are provided for measuring different parameters
of the converter. The reference design can be modified to support output voltages from
3.3V to 5V by changing a single resistor.
1.4
WHAT THE MCP19035 600 kHz HIGH-VOLTAGE SYNCHRONOUS BUCK
CONTROLLER REFERENCE DESIGN KIT CONTAINS
The MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design
kit includes:
• MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference
Design (ARD00514)
• Important Information Sheet
2014 Microchip Technology Inc.
DS50002228A-page 9
MCP19035 600 kHz HIGH-VOLTAGE
SYNCHRONOUS BUCK CONTROLLER
REFERENCE DESIGN USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design
was developed to provide a compact, low-cost and highly efficient step-down conversion for low to medium output currents.
2.1.1
MCP19035 600 kHz High-Voltage Synchronous Buck Controller
Reference Design Features
The MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design
has the following key features:
• Input Voltage Range: 8V to 26V
• Output Voltage: 5V (can be adjusted by changing one resistor between 3.3V and
5V)
• Maximum output current: 5A
• 93% typical efficiency at 5V/5A output and 24V input
• 600 kHz fixed switching frequency
• Overcurrent protection for high and low-side MOSFETs
• Power Good (PGOOD) output for monitoring the output voltage quality
• Shutdown input for placing the converter in low-power Standby mode
• Undervoltage Lockout (UVLO) with 4.5V and 3.9V typical thresholds
2.2
GETTING STARTED
The MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design
is fully assembled and tested to evaluate and demonstrate the MCP19035 capabilities.
2.2.1
•
•
•
•
•
•
DS50002228A-page 10
Instruments and Tools Required
Adjustable DC power supply with 0V-30V/5ADC range output capability
Electronic load with at least 5A current capability and load stepping capability
Digital oscilloscope with a minimum bandwidth of 50 MHz
Digital voltmeter/ammeter
Optionally, a network analyzer/Bode plot analyzer for loop analysis
Wires for connections; these wires must sustain high currents (5A for the
connection between adjustable DC power supply and board, 5A for the
connection between board and the electronic load)
2014 Microchip Technology Inc.
Installation and Operation
2.2.2
Setup Procedure
To power up the MCP19035 600 kHz High-Voltage Synchronous Buck Controller
Reference Design, the following steps must be completed:
1. Connect the electronic load to J2 connector of the reference design; the
“positive” (+) and “negative” (-) connector pins are marked on the board silkscreen.
2. Connect the adjustable DC power supply to J1 connector of the reference
design; the “positive” (+) and “negative” (-) connector pins are marked on the
board silkscreen.
3. The DC voltage supplied by the adjustable DC power supply must be 24V.
2.2.3
Board Testing
The typical testing setup is depicted in Figure 2-1. Table 2-1 shows all the available test
points on the board.
The user can connect various instruments at the listed test points to evaluate the
parameters of the converter. The typical performance data, curves and waveforms are
presented in Appendix C. “Typical Performance Data, Curves and Waveforms”.
FIGURE 2-1:
TABLE 2-1:
Typical Test Setup.
TEST POINTS DESCRIPTION
Test Point
Label
TP2, TP4, TP6, TP8, TP10,
TP11, TP12
GND
Power GND
TP7
VIN
Input voltage
TP1
PGOOD
TP9
TP3, TP5
2014 Microchip Technology Inc.
VOUT
CH A, CH B
Description
Power Good output
Output voltage
Signal injection points for loop measurement
DS50002228A-page 11
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design User’s Guide
2.2.4
Adjusting the Output Voltage
The output voltage can be modified by changing the value of R12 from the feedback
divider. The output voltage is set according to Equation 2-1.
EQUATION 2-1:
EQUATION OUTPUT VOLTAGE
R10 + R12
V OUT = V REF -------------------------R12
Where:
VREF = 0.6V
R10 = 20 kΩ
Do not modify the value of the R10 resistor (20 kΩ) because this will affect the loop
compensation of the system.
Some parameters like efficiency, the overcurrent protection thresholds and the input
and output voltage ripples can be affected by the modification of the output voltage. Do
not exceed 6V for the output voltage or permanent damage of the board can occur.
Table 2-2 shows the standard values of R12 resistor for some usual output voltages.
TABLE 2-2:
DS50002228A-page 12
OUTPUT VOLTAGE VERSUS R12 VALUE
VOUT(V)
R12(kΩ)
3.3
4.42
5
2.74
2014 Microchip Technology Inc.
MCP19035 600 kHz HIGH-VOLTAGE
SYNCHRONOUS BUCK CONTROLLER
REFERENCE DESIGN USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP19035 600
kHz High Voltage Synchronous Buck Controller Reference Design:
•
•
•
•
•
Board – Schematic
Board – Top Silk
Board – Top Silk And Copper
Board – Bottom Copper
Board – Bottom Copper and Silk
2014 Microchip Technology Inc.
DS50002228A-page 13
1
BOARD – SCHEMATIC
J1
2 1
DS50002228A-page 14
A.2
PGND
ED120/2DS
GND
GND
1
1
TP11
TP12
1
TP7
VIN
PGND
C1
10uF
R2
PGND PGND
R3
0
D1
100k
3.9k
5.6nF
3
4
C5
Term Block 2Pin 2.54mm
5
47pF
COMP
MCP19035
3.3
0.33uF
100k
PGND
PGND
PGND
R9
49.9
1
2014 Microchip Technology Inc.
2k7
R13
C8
750
680pF
GND
TP2
1
GND
1
1
TP3
TP5
CH A
GND
SGND
SGND
TP4
1
CH B
SGND
SGND
TP6
1
SGND
47uF
C10
47uF
ED120/2DS
GND
PGND
R10 20k
R12
C4
TP8
5.1k
PGOOD
J2
C7
R8
TP1
VOUT
G2
4.7uF
PGOOD
TP9
L1
4.7uH/7A
6
VCC
Q3
2N7002-7-F
5.1k
C3
R6
PGOOD
R7
R5
SGND
PGND
Schematic and Layouts
1uF
7
LOWDR
PWRGD
D2/S1
8
BOOT
VIN
C6
9
PHASE
1
C2
10
HIGHDR
FB
A/S2
2 1
R4
SHDN
GND
2
11
1
Si4816BDY
G1
U1
J3
10uF
1
5.1k
C9
1 2
R1
PGND
Schematic and Layouts
A.3
BOARD – TOP SILK
2014 Microchip Technology Inc.
DS50002228A-page 15
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design User’s Guide
A.4
BOARD – TOP SILK AND COPPER
DS50002228A-page 16
2014 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM COPPER
2014 Microchip Technology Inc.
DS50002228A-page 17
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design User’s Guide
A.6
BOARD – BOTTOM COPPER AND SILK
DS50002228A-page 18
2014 Microchip Technology Inc.
MCP19035 600 kHz HIGH-VOLTAGE
SYNCHRONOUS BUCK CONTROLLER
REFERENCE DESIGN USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1:
BILL OF MATERIALS (BOM)
Qty. Reference
Description
Manufacturer
Part Number
2
C1, C9
Cap. ceramic 10 UF 35V 20% X7R 1210
1
C2
Cap. ceramic 5600 PF 25V 5% NP0 0603 TDK Corporation
Taiyo Yuden Co., Ltd. GMK325AB7106MM-T
C1608C0G1E562J080AA
1
C3
Cap. ceramic 0.33 UF 16V 10% X7R
0603
GRM188R71C334KA01D
2
C4, C10
Cap. ceramic 47 UF 10V 20% X7R 1210
Taiyo Yuden Co., Ltd. LMK325B7476MM-TR
1
C5
Cap. ceramic 47 PF 50V 5% NP0 0603
AVX Corporation
C1608C0G1H470J080AA
1
C6
Cap. ceramic 1 UF 35V 10% X7R 0805
TDK Corporation
CGA4J3X7R1V105K
1
C7
Cap. ceramic 4.7 UF 35V 10% X7R 0805 TDK Corporation
1
C8
Cap. ceramic 680 PF 50V 5% NP0 0603
TDK Corporation
C1608C0G1H681J080AA
2
J1, J2
Terminal Block 5.08 MM vert. 2 POS
On-Shore
Technology, Inc.
ED120/2DS
Murata Americas
C2012X7R1V475K125AC
1
J3
Conn. header vert. 100" gold
TE Connectivity, Ltd.
5-146868-1
1
L1
Inductor power 4.7 UH 8.5A SMD
Wurth® Electronik
Group
74477004
0
PCB
MCP19035 600 kHz High-Voltage
Synchronous Buck Controller Reference
Design Printed Circuit Board
–
104-00514
1
Q1
Dual N-Channel 30-V (D-S) MOSFET
with Schottky Diode
Vishay
SI4816BDY-T1-E3
1
Q3
MOSFET N-Channel 60V 115 MA
SOT-23-3
Diodes® Incorporated 2N7002-7-F
3
R1, R7, R8
Res. 5.1k Ohm 1/10W 1% 0603 SMD
Panasonic® – ECG
ERJ-3EKF5101V
2
R2, R6
Res. 100k Ohm 1/10W 1% 0603 SMD
Panasonic – ECG
ERJ-3EKF1003V
1
R3
Res. 0 Ohm 1/10W 0603 SMD
Panasonic – ECG
ERJ-3GEY0R00V
1
R4
Res. 3.9K Ohm 1/10W 5% 0603 SMD
Panasonic – ECG
ERJ-3GEYJ392V
1
R5
Res. 3.3 Ohm 1/10W 1% 0603
Panasonic – ECG
ERJ-3RQF3R3V
1
R9
Res. 49.9 Ohm .25W 1% 0603 SMD
Vishay/Dale
CRCW060349R9FKEAHP
1
R10
Res. 20k Ohm 1/10W 1% 0603 SMD
Panasonic – ECG
ERJ-3EKF2002V
1
R12
Res. 2.70K Ohm 1/10W 1% 0603 SMD
Panasonic – ECG
ERJ-3EKF2701V
1
R13
Res. 750 Ohm 1/10W 1% 0603 SMD
Vishay/Dale
CRCW0603750RFKEA
12
TP1 - TP12
PC test point compact SMT
Keystone Electronics
Corp.
5016
1
U1
High-Speed Synchronous Buck
Controller
Microchip Technology
MCP19035-BAAAE/MF
Inc.
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.
2014 Microchip Technology Inc.
DS50002228A-page 19
MCP19035 600 kHz HIGH-VOLTAGE
SYNCHRONOUS BUCK CONTROLLER
REFERENCE DESIGN USER’S GUIDE
Appendix C. Typical Performance Data, Curves and Waveforms
C.1
INTRODUCTION
This chapter shows some of the typical performance parameters and curves of the
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design.
TABLE C-1:
CONVERTER PARAMETERS
Parameter
Value
Input Voltage Range (V)
Comments
8 - 26
Output Voltage (V)
5
±2.5% Tolerance
Maximum Output Current (A)
5
Steady state output current
Output Voltage Ripple (mV)
< 50
VIN = 24V, IOUT = 4A
Input Voltage Ripple (mV)
< 200
VIN = 24V, IOUT = 4A
< 200
Step Load 1A to 4A
Output Voltage Overshoot during Step Load (mV)
Switching Frequency (kHz)
550 - 650
Typical 600 kHz
100
90
Efficiency (%)
80
VIN = 24V
70
VIN = 18V
60
VIN = 12V
50
40
30
20
10
0
FIGURE C-1:
DS50002228A-page 20
0
1000
2000 3000
IOUT (mA)
4000
5000
6000
Efficiency.
2014 Microchip Technology Inc.
VOUT (V)
Typical Performance Data, Curves and Waveforms
5.1
5.09
5.08
5.07
5.06
5.05
5.04
5.03
5.02
5.01
5
Vout
0
2000
4000
6000
IOUT (mA)
FIGURE C-2:
Load Regulation (VIN = 24V).
FIGURE C-3:
BW = 20 MHz).
Output Voltage Ripple/Noise (VIN = 24V, IOUT = 4A,
2014 Microchip Technology Inc.
DS50002228A-page 21
MCP19035 600 kHz High-Voltage Synchronous Buck Controller Reference Design User’s Guide
DS50002228A-page 22
FIGURE C-4:
BW = 20 MHz).
Input Voltage Ripple/Noise (VIN = 24V, IOUT = 4A,
FIGURE C-5:
Step Load (VIN = 24V).
2014 Microchip Technology Inc.
Typical Performance Data, Curves and Waveforms
FIGURE C-6:
2014 Microchip Technology Inc.
Bode Plots (VIN = 24V, VOUT = 5V; IOUT = 5A).
DS50002228A-page 23
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