MCP1630RD-DDBK1 - Microchip Technology

MCP1630

+12V In Dual Output

Buck Converter

Reference Design

Information contained in this publication regarding device

applications and the like is provided only fo r your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EXPRESS OR

IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELATED TO THE INFORMATION,

INCLUDING BUT NOT LIMITED TO ITS CONDITION,

QUALITY, PERFORMANCE, MERCHANTABILITY OR

FITNESS FOR PURPOSE. Microchip disclaims all liability

arising from this information and its use. Use of Microchip

devices in life support and/or safety applications is entirely at

the buyer’s risk, and the buyer agrees to defen d, indemnify and

hold harmless Microchip from any and all damages, claims,

suits, or expenses resulting from such use. No licenses are

conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron,

dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

PICSTART, rfPIC and SmartShunt are registered trademarks

of Microchip Technology Incorporated in the U.S.A. and other

countries.

FilterLab, Linear Active Thermistor, MXDEV, MXLAB,

SEEV AL, SmartSensor and The Embedded Control Solutions

Company are registered trademarks of Microchip Technology

Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard,

dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,

ECONOMONITOR, FanSense, In-Circuit Serial

Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB

Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM,

PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,

PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total

Endurance, UNI/O, WiperLock and ZENA are trademarks of

Microchip Te chnology Incorporated in the U. S.A. and other

countries.

SQTP is a service mark of Microchip T echnology Incorporated

in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

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

• 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

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Microchip received ISO/TS-16949:200 2 certif ication for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping

devices, Serial EEPROMs, microper ipher als, nonvol ati le memo ry and

analog product s. In addition, Microchip ’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

MCP1630 DUAL BUCK

REFERENCE DESIGN

Table of Contents

Preface ...........................................................................................................................1

Chapter 1. Product Overview

1.1 Introduction ..................................................................................................... 5

1.2 What IS the MCP1630 Dual Buck Reference Design? ..................................6

1.3 What the MCP1630 Dual Buck Reference Design kit includes ......................6

Chapter 2. Installation and Operations

2.1 Introduction ..................................................................................................... 7

2.2 Features .........................................................................................................7

2.3 Getting Started ...............................................................................................7

Appendix A. Schematic and Layouts

A.1 Introduction and Highlights ..........................................................................13

A.2 Board - Schematic - Sheet 1 ........................................................................ 14

A.3 Board - SchEmatic - Sheet 2 .......................................................................15

A.4 Board - Top Layer ........................................................................................ 16

A.5 Board - Mid-Layer 1 ..................................................................................... 17

A.6 Board - Mid-Layer 2 ..................................................................................... 18

A.7 Board - Bottom Layer ................................................................................... 19

Appendix B. Bill Of Materials (BOM)

Appendix C. Evaluation Board Firmware

C.1 Device Firmware .......................................................................................... 23

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

MCP1630 Dual Buck Reference Design

NOTES:

MCP1630 DUAL BUCK

REFERENCE DESIGN

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP1630 Dual Buck 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 descri bes how to use the MCP1630 Dua l Buck Reference Design as a

development tool. The manual layout is as follows:

•Chapter 1. “Product Overview” – Important information about the MCP1630

Dual Buck Reference Design.

•Chapter 2. “Installation and Operations” – Includes instructions on how to get

starte d with this reference design and a description of the reference design

operation.

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

diagrams for the MCP1630 Dual Buck Reference Design.

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

MCP1630 Dual Buck R efer ence Desig n.

•Appendix C. “Evaluation Board Firmware” - Provides information about the

application firmware and where the source code can be found.

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 on-line help.

Select the Help menu, and then Topics to open a list of available on-line help files.

MCP1630 Dual Buck Reference Design

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

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 “Save project before build”

Underlined, italic text with

right angle bracket A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-li n e op ti o ns -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filena me

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | } Choice of mutually exclusive

arguments; an OR selection errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user void main (void)

{ ...

}

Preface

RECOMMENDED READING

This reference gu id e de scr ibe s ho w to us e MCP1630 Dual Buck Refe re nc e De sign .

Other useful documents are listed below. The following Microchip documents are

available and re co mm e nd e d as supp le me n tal refere nce re sou r ces .

MCP1630 Data Sheet, “High-Speed, Microcontroller-Adaptable, Pulse Width

Modulator”, DS21896

MCP1630 NiMH Demo Bo ard Use r's Gu id e, DS5150 5

AN960 - “New Components and Design Methods Bring Intelligence to Battery

Charger Applications”, DS00960

MCP14628 Data Sheet, “2A Synchronous Buck Power MOSF ET Driver”, DS22083

MCP1703 Data Sheet, “250 mA, 16V, Low Quiescent Current LDO”, DS22049

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 – Da ta sheets and errata, application notes and sample

programs, design resources, user’s guides and hardware support documents,

latest software releases and archived software

•General Te chnical Support – Frequently Asked Questions (FAQs), technical

support reque s ts, online dis cus sio n groups, Microc hip 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 repr esentatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Of fice

• Field Application Engineer (FAE)

• Technical Support

Customers should conta ct their distributor, repr esent ative or field app lication eng ineer

(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 B (July 2008)

• Changed U2 and U7 to MCP14628;

• Changed U4 to MCP1703.

Revision A (February 2005)

• Inital Release of this Document.

MCP1630 Dual Buck Reference Design

NOTES:

MCP1630 DUAL BUCK

REFERENCE DESIGN

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP1630 Dual Buck Reference Design is used to evaluate the Microchip

MCP1630 analog, high-speed Pulse Width Modulator (PWM) used in a dual synchro-

nous, buck regulator , power-converter application. The evaluation board is a complete,

stand-alone, dual-output, dc-dc converter with +12V input, ad justable dual output at

20A per output .

This chapter also covers the following topics:

• What is the MCP1630 Dual Buck Reference Design?

• What the MCP1630 Dual Buck Reference Design kit includes.

FIGURE 1-1: Dual Buck Converter Block Diagram.

Synch

Gate

Drive

CS PWM

OSC

COMP

VREF

+VIN

VOUT1

Synch

Gate

Drive

CS PWM

OSC

COMP

VREF

VOUT2

PIC16F684

Active-Filter

MCP6231 SC-70

Active-Filter

MCP6231 SC-70

LBUCK

COUT1

COUT2

VOUT1

VOUT2

60T

Temp

Sense

Temp

Sense

Temperature sensor located

close to the power switches of

each channel

“Bit bang reference”

MCP1630

+VCC

–

MCP1630 Dual Buck Reference Design

1.2 WHAT IS THE MCP1630 DUAL BUCK REFERENCE DESIGN?

The MCP1630 Dual Buck Reference Design is a complete, stand-alone, dual-output

power supply capable of 20A per output, powered from a +12V input source. This board

utilizes Microchip’s MCP1630 (high-speed PIC® MCU PWM MSOP8), MCP1703 (LDO

SOT-89), PIC16F684 (MCU Flash TSSOP14 ), MCP6231U (Op Amp SC-70) , TC6501

(Temperature Switch SOT23A-5) and MCP14628 (synchron ous MOSFET driver

SOIC8). The input voltage range for the reference design is +9.0V to +13.5V. Both

adjustable regulated outputs are capable of 20A.

Input terminals are provided to apply an intput voltage to the power supply. Output

terminals are also provided as a way to connect the 20A outputs to a load.

1.3 WHAT THE MCP1630 DUAL BUCK REFERENCE DESIGN KIT INCLUDES

This MCP1630 Dual Buck Reference Design Kit includes:

• The MCP1630 Dual Buck Reference Design (102-00035)

• Analog and Interface Product Demonstra tion Boards CD-ROM (DS21912)

- MCP1630 Dual Buck Reference Design (DS51531)

- MCP1630 Data Sheet (DS21896)

MCP1630 DUAL BUCK

REFERENCE DESIGN

Chapter 2. Installation and Operations

2.1 INTRODUCTION

The MCP1630 Dual Buck Reference Desi gn demonstrates Microchip’s MCP1630

high-speed PWM, used in an adjustable, dual-output, buck regulator application.

The MCP1630 is a high-speed, microcontroller-adaptable, PWM that, when used in

conjunction with a microcontroller, will control the power system duty cycle to provide

output voltage regulation. The PIC16F684 mi crocontroller can be used to regulate

output voltage or current, switching frequency and setting maximum duty cycle.

The MCP1630 generates duty cycle, provides fast overcurrent protection and utilizes

variable external inputs. External signals include the input oscillator and the reference

voltage. The power train signals include the current sense and the feedback voltage.

The output signal is a square-wave pu lse. The power train used for the MCP16 30 Dual

Buck Reference Design is a dual synchronous buck regulator.

2.2 FEATURES

The MCP1630 Dual Buck Reference Design has the following features:

• Input Voltage Range: +9.0V to +13.5V

• Adjustable Output Voltage Capable of Calibration

• Sequencing or Tracking Outputs

• Outputs are180° out of phase, each capable of 20A

• Independent Overcurrent Protection

• Independent Overtemperature Protection

• Input Overvoltage and Undervoltage Lockout (UVLO)

• Power Good Indication (LED) with Adjustable Delay

• Switching Frequency Dithering

2.3 GETTING STARTED

The MCP1630 Dual Buck Reference Design is fully assembled and tested over its

range of input voltage, output voltage and output current. This board requires the use

of an external input voltage source (+9.0V to +13.5V) and external load (electronic or

resistive).

Note: It is recommended that a minimum 300 linear feet per minute of airflow

blown directly across the boar d to cool the power dissipating components

when operating above 10A loads.

MCP1630 Dual Buck Reference Design

2.3.1 Power Input and Output Connections

Powering the MCP1630 Dual Buck Reference Design.

1. Apply the input volt age to the connector (J3) provided. Connect the positive side

of the input source (+) to the test point (J3-1). Connect the negative (or return

side (-)) of the input source to the GND terminal (J3-2). J3 is the center two

position terminal block located on the lef t side of the board. A 14-gauge wire size

is recommend ed for eva lua tin g th e bo ar d at 20A pe r ou tp u t. The po we r su pp ly

input voltage must be in the specified operating range for the board to operate.

An undervoltage lockout circuit prevents the converter from r unning when the

input voltage is too low.

2. An on/of f push-button switch (SW3) is used to turn the converter output s on and

off. During normal power-up, the outputs are turned on by pressing SW3 once.

To turn the outputs off, press SW3 again.

3. In the event of a fault, (input volt age out-of-range, output volt age out-of-range or

power train overtemperature), both VOUT1 and VOUT2 will shut down, indicated

by the D1 power good LED flashing. To restart, the input voltage must be brought

to 0V and raised back to the specified inpu t voltage range of the converter prior

to pressing the on/off button. A solid D1 power good LED indicates that the

regulator outputs are operating properly at their programmed values.

Applying the load to the MCP1630 Dual Buck Reference Design.

1. To apply a load to VOUT1 of the MCP1630 Dual Buck Refe re n ce Desig n,

the positive side of the VO1 load (+) should be connected to the terminal +VO1

(J2-2). The ne g at i ve sid e of the V O1 load should be connected to the terminal

GND (J2-1).

2. To apply a load to VOUT2 of the MCP1630 Dual Buck Refe re n ce Desig n,

the positive side of the VO2 load (+) should be connected to the terminal +VO2

(J4-2). The ne g at i ve sid e of the V O2 load should be connected to the terminal

GND (J4-1).

3. Outputs VO1 and VO2 are independen t of each other and are loaded sep arately.

Both outputs have independent over curren t protection, overtemperature and

short-circuit protection.

2.3.2 Power Present and Power Good Indication

1. The MCP1630 Dual Buck Reference Design has two status LED’s. One LED

(D3) is used to determine if input voltage is present.

2. The second LED (D1) is used for fault and po wer good indication. During normal

operation, if both regulator outputs are within regulation, D1 is illuminated to

provide indication that power is good. If either output is out of regulation, D1 will

blink, providing indication that one or both of the outputs are not in regulation.

Note: The maximum rated load is 20A per output. When loadin g the board over

10A, airflow is necessary to prevent the overtemperature protection

circuitry from automatically turing off the power train that has the

overtemperature condition.

Installation and Operations

2.3.3 Programming

1. The MCP1630 Dual Buck Reference Design can be programmed to calibrate

VOUT1, VOUT2, output sequ encin g or tr acking an d switching frequ ency di ther ing

on or off.

2. To enter the programming mode, apply input voltage within the specified

operating range (9V to 13.5V). Press and hold the M (SW1) button. While still

holding the M button, press and release the on/off (SW3) button. The flashing

rate of LED D1 should increase, indicating Programming mode.

3. Once in Programming mode, the first variable to set is VOUT1. Press the select

S button to increase VOUT1. Keep pressing the S button to increase VOUT1 until

it wraps around to the minimum setting.

4. Press M once to select VOUT2. VOUT2 in increased by pressing the S button

similar to setting VOUT1.

5. Press M once to select between output sequencing or tracking. D1 flashing

indicates that sequencing is selected. Press M to change from sequencing to

tracking, or from tracking to sequencing.

6. Press M once to select between fre quency dithering on and fr equency dithering

off. D1 flashing indi cates that frequency dithering is selected.

7. By pressing and holding the M button, the selected settings will be programmed.

The next power-up cycle for the converter will return to the programmed settings.

FIGURE 2-1: Mode, Select and On/Off Switch Location.

Note: The range of VOUT1 is controlled by the value of fixed resistors R34, R35 and

R10. The range of VOUT1 is typically from 2.42V (minimum) to 3.39V

(maximum).

Note: The range of VOUT2 is controlled by the value of fixed resistors R14, R15 and

R42. The range of VOUT2 is typically from 1.22V (minimum) to 2.3V

(maximum).

BOARD

On/Off

Select

Mode

MCP1630 Dual Buck Reference Design

NOTES:

MCP1630 DUAL BUCK

REFERENCE DESIGN

Appendix A. Schematic and Layouts

A.1 INTRODUCTION AND HIGHLIGHTS

This appendix contains the following schematics and layouts for the MCP1630 Dual

Buck Reference Design:

• Board Schematic - Sheet 1

• Board Schematic - Sheet 2

• Board - Top Layer

• Board - Mid-Layer 1

• Board - Mid-Layer 2

• Board - Bottom Layer

MCP1630 Dual Buck Reference Design

A.2 BOARD SCHEMATIC - SHEET 1

Schematic and Layouts

A.3 BOARD SCHEMATIC - SHEET 2

MCP1630 Dual Buck Reference Design

A.4 BOARD - TOP LAYER

BOARD

Schematic and Layouts

A.5 BOARD - MID-LAYER 1

BOARD

MCP1630 Dual Buck Reference Design

A.6 BOARD - MID-LAYER 2

MIDLAYER2

BOARD

Schematic and Layouts

A.7 BOARD - BOTTOM LAYER

MCP1630 Dual Buck Reference Design

NOTES:

MCP1630 DUAL BUCK

REFERENCE DESIGN

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

9 C1, C9, C16,

C25, C26, C29,

C33, C36, C38

CAP 1.0UF 10V CERAMIC X5R 0603 Panasonic® - ECG ECJ-1VB1A105K

4 C2, C4, C20, C37 CAP 1500PF 50V CERAMIC NPO 0603 Panasonic - ECG ECJ-1VB1H152K

2 C3, C15 CAP 220UF 4V AO X7343 Kemet Electronics®A700X227M004ATE015

2 C5, C19 CAP 9.0PF 50V CERAMIC NPO 0603 Panasonic - ECG ECJ-1VC1H090D

10 C6, C7, C11,

C14, C17, C27,

C30, C31, C32,

C34

CAP .10UF 10V CERAMIC X7R 0603 Kemet Electronics C0603C104K8RACTU

2 C8, C18 CAP 4.7UF 10V CERAMIC X5R 0603 Panasonic - ECG ECJ-1VB0J475M

2 C10, C35 CAP .22UF 10V CERAMIC X5R 0603 Panasonic - ECG ECJ-1VB1A224K

2 C12, C13 CAP 22UF 16V CERAMIC X5R 1210 TDK Electronics

Corporation C3225X5R1C226M

2 C21, C22 CAP DNP0603

2 C23, C39 CAP 33PF 50V CERAMIC NPO 0603 Panasonic - ECG ECJ-1VC1H330J

2 C24, C40 CAP 1000PF 50V CERAMIC NPO 0603 Panasonic - ECG ECJ-1VC1H102J

1 C28 CAP CERAMIC 18PF 50V 0603 SMD Panasonic - ECG ECJ-1VC1H180J

2 D1, D3 LED 660NM SUPER RED DIFF 0603SMD Lumex® Opto/

Components Inc. SML-LX0603SRW-TR

1 D2 DIODE SCHOTTKY 25V 1.0A MINI-2P Panasonic - SSG MA2YD2300L

1 J1 CONN MOD JACK 6-6 R/A PCB 50AU AMP/Tyco

Electronics 555165-1

3 J2, J3, J4 CONN TERM BLOCK 2POS 5MM PCB Phoenix Contact®1715022

2 L1, L2 HIGH CURRENT SMT 1UH INDUCTORS Cooper Electronics HC1-1R1

2 Q1, Q4 N-CHANNEL MOSFET DPAK Fairchild®

Semiconductor FDD6676S

2 Q2, Q3 N-CHANNEL MOSFET DPAK Fairchild

Semiconductor FDD6670A

10 R1, R6, R12,

R17, R20, R23,

R27, R31, R43,

R52

RES 10.0 OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF10R0V

6 R2, R19, R22,

R25, R29, R50 RES DNP0603

2 R3, R24 RES 3.30 OHM 1/4W 1% 1206 SMD Yageo America 9C12063A3R30FGHFT

2 R4, R46 RES 1.00K OHM 1/16W 1% 0603 SMD Panasonic - ECG P1.00KHCT-ND

2 R5, R18 RES 221 OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2210V

4 R7, R9, R16, R21 RESISTOR 1.0 OHM 1/10W 5% 0603 Panasonic - ECG ERJ-3GEYJ1R0V

2 R8, R45 RES 14.7K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1472V

2 R10, R15 RES 24.9K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2492V

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 compone nts.

MCP1630 Dual Buck Reference Design

3 R11, R39, R44 RES 7.87K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF7871V

1 R13 RES 4.99K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4991V

1 R14 RES 22.1K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2212V

3 R26, R40, R51 RES 3.01K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF3011V

2 R28, R49 RES 30.1K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF3012V

1 R30 RES 4.75K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4751V

1 R32 RES 2.0K OHM 1/10W 5% 0603 SMD Panasonic - ECG E RJ-3GEYJ202V

3 R33, R36, R48 RES 100K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1003V

2 R34, R41 RES 15.0K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1502V

2 R35, R42 RES 10.0K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1002V

1 R37 RES 2.2 OHM 1/4W 1% 1206 SMD Panasonic - ECG E RJ-8RQF2R2V

1 R38 RES 332 OHM 1/16W 1% 0603 SMD Panasonic - ECG E RJ-3EKF3320V

1 R47 RES 2.21K OHM 1/16W 1% 0603 SMD Panasonic - ECG P2.21KHCT-ND

3 SW1, SW2, SW3 SWITCH TACT 6MM 260GF SMT E-Switch Inc. TL3301NF260QG

1 T1 SMD Current Sense Transformer Datatronics™ CT323-060

1 TP6 PC TEST POINT COMPACT SMT Keystone

Electronics 5016

2 U1, U8 High-Speed Analog PWM MSOP8 Microchip

Technology Inc. MCP1630-E/MS

2 U2, U7 2A Synchronous MOSFET Driver Microchip

Technology Inc. MCP14628-E/SN

2 U3, U6 5 Lead SC70 OP AMP Microchip

Technology Inc. MCP6231U

1 U4 250 mA Low Iq LDO Regul ator Microchip

Technology Inc. MCP1703-5002E/MB

1U5 IC PIC

® MCU FLASH 2KX14 14TSSOP Microchip

Technology Inc. PIC16F684-I/ST

2 U9, U10 MCP6501 TEMPERA TURE SWITCH 75°C Microchip

Technology Inc. TC6501P075VCTTR

TABLE B-1: BILL OF MATERIALS (BOM) (CONTINUED)

Qty Reference Description Manufacturer Part Number

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.

MCP1630 DUAL BUCK

REFERENCE DESIGN

Appendix C. Evaluation Board Firmware

C.1 DEVICE FIRMWARE

For the late st version of the MCP1630 Du al Buck Reference Design firm ware, visit the

Microchip web site at www.microchip.com.

FIGURE C-1: Firmware Flowcharge - Page 1.

Power-Up

Initialize:

Ports, Clocks, A/D,

PWM, IIC and

Interrupts

Yes

Detected? No

Mode

Pressed?

Start Converter

Using programmed

settings

LED Flashing

Turn VOUT1 On

Mode

Pressed?

Set

Pressed?

Set up VOUT2

Select

Sequencing

Select Frequency

Dithering On or

Off

Setup

Complete No

Increment

PWM

Yes

Fault

Detected

Yes

Shutdown Converter

Flash LED

Off

Detected No

End

Yes

VIN ok?

or Tracking

AMERICAS

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://support.microchip.com

Web Address:

www.microchip.com

Atlanta

Duluth, GA

Tel: 678-957-9614

Fax: 678-957-1455

Boston

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

Detroit

Farmington Hills, MI

Tel: 248- 538-2250

Fax: 248-538-2260

Kokomo

Kokomo, IN

Tel: 765- 864-8360

Fax: 765-864-8387

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

Santa Clara

Santa Clara, CA

Tel: 408- 961-6444

Fax: 408-961-6445

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor

Tower 6, The Gateway

Harbour City, Kowloon

Hong Kong

Tel: 852-2401-1200

Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511

Fax: 86-28-8665-7889

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

China - Qingdao

Tel: 86- 532-8502-7355

Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86- 755-8203-2660

Fax: 86-755-8203-1760

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

China - Xiamen

Tel: 86-592-2388138

Fax: 86-592-2388130

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

China - Zhuhai

Tel: 86-756-3210040

Fax: 86-756-3210049

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-4182-8400

Fax: 91-80-4182-8422

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

Korea - Seoul

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

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

WORLDWIDE SALES AND SERVICE

01/02/08

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Microchip:

MCP1630RD-DDBK1