Microchip MCP19035 User Manual

MCP19035

Power Module 8A

Reference Design

User’s Guide

 2019 Microchip Technology Inc. DS50002840A

Note the following details of the code protection feature on Microchip devices:

YSTEM

CERTIFIE DBYDNV

== ISO/TS16949==

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
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Information contained in this publication regarding device
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and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
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®

MCUs and dsPIC® DSCs, KEELOQ

®

code hopping

QUALITYMANAGEMENTS

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All other trademarks mentioned herein are property of their
respective companies.

© 2019, Microchip Technology Incorporated, All Rights Reserved.

ISBN: 918-1-5224-4099-4

DS50002840A-page 2  2019 Microchip Technology Inc.

MCP19035 POWER MODULE

8A REFERENCE DESIGN

USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 4

Introduction............................................................................................................ 4

Document Layout .................................................................................................. 4

Conventions Used in this Guide ............................................................................ 5

Recommended Reading........................................................................................ 6

The Microchip WebSite ......................................................................................... 6

Customer Support ................................................................................................. 6

Document Revision History ................................................................................... 6

Chapter 1. Product Overview

1.1 Introduction ..................................................................................................... 7

1.2 MCP19035 Overview ..................................................................................... 7

1.3 What is the MCP19035 Power Module 8A Reference Design? ..................... 8

1.4 What the MCP19035 Power Module 8A Reference Design Kit Contains ...... 8

Chapter 2. Installation and Operation

2.1 Introduction ..................................................................................................... 9

2.2 Getting Started ............................................................................................... 9

Appendix A. Schematic and Layouts

A.1 Introduction .................................................................................................. 12

A.2 Board – Schematic ....................................................................................... 13

A.3 Board – Top Silk .......................................................................................... 14

A.4 Board – Top Copper and Silk ....................................................................... 14

A.5 Board – Top Copper .................................................................................... 14

A.6 Board – Bottom Copper ............................................................................... 15

A.7 Board – Bottom Copper and Silk ................................................................. 15

A.8 Board – Bottom Silk ..................................................................................... 15

Appendix B. Bill of Materials (BOM)

Appendix C. Reference Design Waveforms

C.1 Typical Performance Data, Curves and Waveforms .................................... 17

Worldwide Sales and Service .................................................................................... 20

 2019 Microchip Technology Inc. DS50002840A-page 3

MCP19035 POWER MODULE

8A 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 website
(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
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 Power Module 8A Reference Design. Items discussed in this chapter
include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip WebSite

• Customer Support

• Document Revision History

®

IDE online help.

DOCUMENT LAYOUT

This document describes how to use the MCP19035 Power Module 8A 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

Power Module 8A Reference Design.

• Chapter 2. “Installation and Operation” – Includes instructions on installing and

starting the MCP19035 Power Module 8A Reference Design.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout

diagrams for the MCP19035 Power Module 8A Reference Design.

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the

MCP19035 Power Module 8A Reference Design.

• Appendix C. “Reference Design Waveforms” – Lists the typical performance

data, curves and waveforms.

 2019 Microchip Technology Inc. DS50002840A-page 4

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB

Initial caps A window the Output window

Quotes A field name in a window or

Underlined, italic text with
right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text 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 repeated text var_name [,

Preface

®

IDE User’s Guide

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

A dialog the Settings dialog

A menu selection select Enable Programmer

“Save project before build”

dialog

A menu path File>Save

A tab Click the Power tab

4‘b0010, 2‘hF1
where N is the total number of
digits, R is the radix 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’

any valid filename

[options]

Choice of mutually exclusive
arguments; an OR selection

Represents code supplied by
user

errorlevel {0|1}

var_name...]

void main (void)

{ ...

}

 2019 Microchip Technology Inc. DS50002840A-page 5

RECOMMENDED READING

This user’s guide describes how to use the MCP19035 Power Module 8A 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”
(DS20002326)

• MCP19035 User’s Guide – “MCP19035 600 kHz High-Voltage Synchronous
Buck Controller Reference Design User’s Guide” (DS50002228)

• MCP19035 Design Analyzer v1.0

THE MICROCHIP WEBSITE

Microchip provides online support via our website at www.microchip.com. This website
is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the website 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 website at:

http://www.microchip.com/support.

DOCUMENT REVISION HISTORY

Revision A (January 2019)

• Initial release of this document

 2019 Microchip Technology Inc. DS50002840A-page 6

Chapter 1. Product Overview

C

IN

C

OUT

MCP19035

HDRV

LDRV

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BOOT

+VCC

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BOOT

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IN

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OFF

1.1 INTRODUCTION

This chapter provides an overview of the MCP19035 Power Module 8A Reference
Design and covers the following topics:

• MCP19035 Overview

• What is the MCP19035 Power Module 8A Reference Design?

• What the MCP19035 Power Module 8A Reference Design Kit Contains

1.2 MCP19035 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 (PG) 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 include: medium currents Point-of-Load converters, FPGA/DSP
power supplies, USB power ports, digital Set-Top boxes, industrial 24V rails converters,
high-power LED drivers.

The internal high-current linear voltage regulator (LDO) allows low-current loads (ex.

®

PIC

microcontrollers) to be powered directly from this controller without any additional

components.

MCP19035 POWER MODULE

8A REFERENCE DESIGN

USER’S GUIDE

FIGURE 1-1: Typical Application.

 2019 Microchip Technology Inc. DS50002840A-page 7

1.3 WHAT IS THE MCP19035 POWER MODULE 8A REFERENCE DESIGN?

The MCP19035 Power Module 8A Reference Design is a compact, highly efficient,
step-down voltage circuit that will convert the input voltage rail (typically 12V) to 5V reg­ulated output voltage. The maximum output current for this step-down converter is 8A.
The board demonstrates the capabilities of the MCP19035 600 kHz Synchronous Buck
Converter Controller in a typical high-voltage input step-down application. The
MCP19035 Power Module 8A Reference Design can be modified to support output
voltages from 3.3V to 5.5V by changing a single resistor.

1.4 WHAT THE MCP19035 POWER MODULE 8A REFERENCE DESIGN KIT CONTAINS

The MCP19035 Power Module 8A Reference Design includes the following items:

• MCP19035 Power Module 8A Reference Design (ADM00987)

• Important Information Sheet

 2019 Microchip Technology Inc. DS50002840A-page 8

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The MCP19035 Power Module 8A Reference Design was developed to provide a
compact, low-cost and highly efficient step-down conversion for low to medium output
currents.

The key features of this board include:

• Input Voltage Range: 6V to 18V

• Output Voltage: 5V (can be adjusted by changing one resistor between 3.3V and
5V)

• Maximum Output Current: 8A

• 95% Typical Efficiency at 5V/8A Output and 12V Input

• 600 kHz Fixed Switching Frequency

• Over-Current Protection for High and Low-Side MOSFETs

• Shutdown Input for Placing the Converter in Low-Power Standby Mode

• Under Voltage Lockout (UVLO) with 4.5V and 3.9V (typical) Thresholds

MCP19035 POWER MODULE

8A REFERENCE DESIGN

USER’S GUIDE

2.2 GETTING STARTED

The MCP19035 Power Module 8A Reference Design is fully assembled and tested to
evaluate and demonstrate the MCP19035 capabilities.

2.2.1 Necessary Instruments and Tools

• Adjustable DC Power Supply with 0V-30V/5ADC range output capability

• Electronic Load with at least 8A current capability and load stepping capability

• Digital Oscilloscope with a minimum bandwidth of 50 MHz

• Digital Voltmeter/Ammeter

• Wires for connections; these wires must sustain high currents, 8A for the connec­tion between adjustable DC Power Supply and board, 8A for the connection
between board and the Electronic Load

2.2.2 Setup Procedure

To power-up the MCP19035 Power Module 8A Reference Design, the following steps
must be completed:

1. Connect the Electronic Load to the J1 connector of the reference design; the

positive (+) and negative (-) connector pins are the 2, 3 and 4 pins, for positive,
respectively 5, 6,10 pins, for negative, off the J1 connector.

2. Connect the Adjustable DC Power Supply to the J1 connector of the reference

design; the positive (+) and negative (-) connector pins are the 7 and 8 pins, for
positive, respectively 5, 6,10 pins, for negative, off the J1 connector.

3. The DC voltage supplied by the Adjustable DC Power Supply must be 12V.

 2019 Microchip Technology Inc. DS50002840A-page 9

Installation and Operation

2.2.3 Board Testing

The typical application is shown in Figure 2-1 and the 3D view of the board with the J1
connector pins numbered is shown in Figure 2-2. For more details, see Appendix
A. “Schematic and Layouts”.

The user can connect various instruments at the listed pins of the J1 connector to eval­uate the parameters of the converter. The typical performance data, curves and wave­forms are presented in Section C.1 “Typical Performance Data, Curves and

Waveforms”.

The user also has two ways to connect the R4 to the circuit. First is to mount the resistor
on the silk footprint on the board, and the second is to connect the R4 to the pins.

FIGURE 2-1: Schematic.

FIGURE 2-2: 3D View of the Board.

 2019 Microchip Technology Inc. DS50002840A-page 10

Installation and Operation

R

4

R3V

REF



V

OUTVREF

–

------------------------------- -=

Where:

V

REF

= 0.6V

R

3

= 20 kΩ

2.2.4 Adjusting the Output Voltage

The output voltage can be modified by changing the value of R4 from the feedback
divider. The output voltage is set according to Equation 2-1.

EQUATION 2-1:

Do not modify the value of the R3 resistor (20 kΩ), as this will affect the loop compen­sation of the system.

Some parameters, such as the 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.

Ta bl e 2 -1 shows the standard values of the R4 resistor for a few usual output voltages.

TABLE 2-1: OUTPUT VOLTAGE VS. R4 VALUE

V

OUT

3.3 4.42 4.3

5 2.74 2.7

R4 (kΩ)

calculated

R4 (kΩ)

E24 standard

2.2.5 Testing Procedure

In the testing procedure, measurements are made on a testing board to help get better
results, as the parameters are at 12V voltage on input and 8A current on output.

 2019 Microchip Technology Inc. DS50002840A-page 11

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP19035 Power
Module 8A Reference Design - ADM00995:

• Board – Schematic

• Board – Top Silk

• Board – Top Copper and Silk

• Board – Top Copper

• Board – Bottom Copper

• Board – Bottom Copper and Silk

• Board – Bottom Silk

MCP19035 POWER MODULE

8A REFERENCE DESIGN

USER’S GUIDE

 2019 Microchip Technology Inc. DS50002840A-page 12

DS50002840A-page 13  2019 Microchip Technology Inc.

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A.2 BOARD – SCHEMATIC

MCP19035 Power Module 8A Reference Design User’s Guide

A.3 BOARD – TOP SILK

A.4 BOARD – TOP COPPER AND SILK

Schematic and Layouts

A.5 BOARD – TOP COPPER

 2019 Microchip Technology Inc. DS50002840A-page 14

A.6 BOARD – BOTTOM COPPER

A.7 BOARD – BOTTOM COPPER AND SILK

Schematic and Layouts

A.8 BOARD – BOTTOM SILK

 2019 Microchip Technology Inc. DS50002840A-page 15

MCP19035 POWER MODULE

8A 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, C2 Capacitor Ceramic, 4.7 µF, 35V, 10%, X7R,

SMD, 0805

1 C3 Capacitor Ceramic, 5600 pF, 50V, 10%, X7R,

SMD, 0402

1 C4 Capacitor Ceramic, 0.33 µF, 16V, 10%, X7R,

SMD, 0603

1 C5 Capacitor Ceramic, 47 pF, 50V, 5%, NP0,

SMD, 0402

2 C6, C9 Capacitor Ceramic, 1 µF, 25V, 10%, X7R,

SMD, 0603, AEC-Q200

2 C7, C8 Capacitor Ceramic, 22 µF, 10V, 10%, X7R,

SMD, 1206, AEC-Q200

1 C10 Capacitor Ceramic, 680 pF, 50V, 10%, X7R,

SMD, 0402

1 J1 Connector Header-2, Male, 2x5, Gold, TH, RASamtec, Inc. TMM-105-01-L-D-RA

TDK Corporation C2012X7R1V475K125AE

Samsung Electro­Mechanics America, Inc

Murata Electronics® GRM188R71C334KA01D

Murata Electronics® GRM1555C1H470JA01D

Samsung Electro­Mechanics America, Inc.

Taiyo Yuden Co., Ltd. LMJ316BB7226KLHT

Wurth Elektronik 885012205060

CL05B562KB5NNNC

CL10B105KA8VPNC

1 L1 Inductor 2.2 µH, 17.8A, 20%, SMD,

L7.5W7.2D7

1 PCB1 Printed Circuit Board Microchip Technology

2 Q1, Q2 Microchip Analog MOSFET N-CH, 25V, 60A,

MCP87055T-U/LC PDFN-8

2 R1, R6 Resistor, TKF, 100k, 1%, 1/10W, SMD, 0402 Panasonic

1 R2 Resistor, TKF, 2.7k, 1%, 1/10W, SMD, 0402 Panasonic

1 R3 Resistor, TKF, 20k, 5%, 1/10W, SMD, 0402 Panasonic® - ECG ERJ-2GEJ203X

0 R4 Do Not Populate – Resistor, TKF, 2.7k, 1%,

1/10W, SMD, 0402

1 R5 Resistor, TKF, 750R, 1/10W, 1%, SMD, 0402 Panasonic® - ECG ERJ-2RKF7500X

1 U1 Microchip Analog PWM Controller, 600 kHz,

MCP19035-BAABE/MF DFN-10

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.

Coilcraft XAL7070-222MEC

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MCP87055T-U/LC

MCP19035-BAABE/MF

 2019 Microchip Technology Inc. DS50002840A-page 16

MCP19035 POWER MODULE

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8A REFERENCE DESIGN

USER’S GUIDE

Appendix C. Reference Design Waveforms

C.1 TYPICAL PERFORMANCE DATA, CURVES AND WAVEFORMS

This chapter shows some of the typical performance parameters and curves of the
MCP19035 Power Module 8A Reference Design.

TABLE C-1: CONVERTER PARAMETERS

Parameter Value Comments

Input Voltage Range (V) 6 - 18

Output Voltage (V) 5 ±1.5% Tolerance

Maximum Output Current (A) 8 Steady state output current

Output Voltage Ripple (mV) < 25 V

Input Voltage Ripple (mV) < 300 VIN = 12V, I

Output Voltage Overshoot during
Step Load (mV)

Switching Frequency (kHz) 550 - 650 Typical 600 kHz

< 200 Step Load 0A to 8A

= 12V, I

IN

OUT

OUT

= 8A

= 8A

FIGURE C-1: Efficiency vs. I

OUT

(A).

 2019 Microchip Technology Inc. DS50002840A-page 17

MCP19035 Power Module 8A Reference Design User’s Guide









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9

287

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,

287

$

FIGURE C-2: Load Regulation (VIN=12V).

FIGURE C-3: Output Voltage Ripple/Noise (V

BW = 20MHz).

 2019 Microchip Technology Inc. DS50002840A-page 18

=12V, I

IN

OUT

=8A,

MCP19035 Power Module 8A Reference Design User’s Guide

FIGURE C-4: Input Voltage Ripple/Noise (VIN=12V, I

FIGURE C-5: Step Load (VIN=12V, I

= 0A to 8A).

OUT

= 8A, BW = 20MHz).

OUT

 2019 Microchip Technology Inc. DS50002840A-page 19

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 2019 Microchip Technology Inc. DS50002840A-page 20

08/15/18