MCP19035
300 kHz Synchronous
Buck Controller
Evaluation Board
User’s Guide
2012 Microchip Technology Inc. DS52099A
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ISBN: 978-1-62076-662-0
EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
32
logo, rfPIC, SST, SST Logo, SuperFlash
QUALITY MANAGEMENT S
DS52099A-page 2 2012 Microchip Technology Inc.
Microchip received ISO/TS-16949:2009 certification for its worldwide
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and manufacture of development systems is ISO 9001:2000 certified.
®
MCUs and dsPIC® DSCs, KEELOQ
®
code hopping
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
Object of Declaration: MCP19035 300 kHz Syn chronous Buc k Contr oller Eva luati on Board
2012 Microchip Technology Inc. DS52099A-page 3
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
NOTES:
2012 Microchip Technology Inc. DS52099A-page 4
MCP19035 300 KHZ SYNCHRONOUS
BUCK CONTROLLER EVALUATION
BOARD USER’S GUIDE
Table of Contents
Preface ...........................................................................................................................7
Introduction............................................................................................................7
Document Layout .................................................................................................. 7
Conventions Used in this Guide............................................................................ 8
Recommended Reading.............................................................. .. ........................9
The Microchip Web Site........................................................................................ 9
Customer Support....................... ....................................................... ...................9
Document Revision History................................................................................... 9
Chapter 1. Product Overview
1.1 Introduction ...................................................................................................11
1.2 MCP19035 Short Overview ..........................................................................11
1.3 What Is the MCP19035 300 kHz Synchronous Buck Controller
Evaluation Bo a rd ? ......... ....................................................... .................. 12
1.4 What the MCP19035 300 kHz Synchronous Buck Control ler
Evaluation Bo a rd K it C o n ta in s ............. .. .......................................... ....... 12
Chapter 2. Installation and Operation
2.1 Introduction ...................................................................................................13
2.2 Getting Sta rted ............................................................................................. 13
2.2.1 Necessary Instruments and Tools .............................................................13
2.2.2 Setup Procedure .......................................................................................13
2.2.3 Board Testing ............................................................................................14
Appendix A. Schematic and Layouts
A.1 Introduction ..................................................................................................17
A.2 Board – Schematic ... .................................................................... ................ 18
A.3 Board – Top Silk and Pads ..........................................................................19
A.4 Board – Top Copper and Silk .......................................................................20
A.5 Board – Top Copper ....................................................................................21
A.6 Board – Mid La ye r 1 ....... ................ .............................................................. 22
A.7 Board – Mid La ye r 2 ....... ................ .............................................................. 23
A.8 Board – Bottom Copper and Pads ...............................................................24
A.9 Board – Bottom Copper, Silk and Pads .......................................................25
Appendix B. Bill of Materials
Appendix C. Typical Performance Data, Curves and Waveforms
C.1 Introduction ..................................................................................................29
Worldwide Sales and Service ....................................................................................36
2012 Microchip Technology Inc. DS52099A-page 5
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
DS52099A-page 6 2012 Microchip Technology Inc.
MCP19035 300 KHZ SYNCHRONOUS
BUCK CONTROLLER EVALUATION
BOARD USER’S GUIDE
Preface
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the p age 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
Select the Help menu, and then Topics to open a list of available online help files.
®
IDE online help.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board. Items discussed
in this chapter include:
• Document Layout
• Conventions Used in this Guide
• Recommended Reading
• The Microchip Web Site
• Customer Support
• Document Revision History
DOCUMENT LAYOUT
This document describes how to use the MCP19035 300 kHz Synchronous Buck
Controller Evaluation Board as a development tool to emulate and debug firmware on
a target board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Shows a brief description of the MCP19035
300 kHz Synchronous Buck Controller Evaluation Board
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with the MCP19035 300 kHz Synchronous Buck Controller Evaluation
Board
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP19035 300 kHz Synchronous Buck Controller Evaluation
Board
• Appendix B. “Bill of Materials” – Lists the parts used to build the MCP19035
300 kHz Synchronous Buck Controller Evaluation Board
• Appendix C. “Typical Performance Data, Curves and Waveforms” – Shows
the typical performance graphs
2012 Microchip Technology Inc. DS52099A-page 7
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following docum entat io n conven tion s:
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic chara c ters Referenced books MPLAB
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
Underlined, italic text with
right angle bracket
Bold characters A dialog button Click OK
N‘Rnnnn A number in verilog format,
Text in angle brac kets < > 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 r epeated text var_name [,
A menu path File>Save
A tab Click the Power tab
where N is the tota l number of
digits, R is th e radi x 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’
Choice of mut ually exclus ive
arguments; an OR selection
Represents code supplied by
user
“Save project before build”
4‘b0010, 2‘hF1
any valid filename
[options]
errorlevel {0|1}
var_name...]
void main (void)
{ ...
}
®
IDE User’s Guide
DS52099A-page 8 2012 Microchip Technology Inc.
RECOMMENDED READING
This user's guide describes how to use MCP19035 300 kHz Synchronous Buck
Controller Evaluation Board. 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 Desi gn T ool”
(DS01452)
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
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 web site at:
http://www.microchip.com/support
DOCUMENT REVISION HISTORY
Revision A (November 2012)
• Initial Release of this Document.
2012 Microchip Technology Inc. DS52099 A-page 9
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
NOTES:
DS52099A-page 10 2012 Microchip Technology Inc.
MCP19035 300 KHZ SYNCHRONOUS
BUCK CONTROLLER EVALUATION
Chapter 1. Product Overview
1.1 INTRODUCTION
This chapter provides an overview of the MCP19035 300 kHz Synchronous Buck
Controller Evaluation Board, and covers the following topics:
• Short Overview: MCP19035
• What Is the MCP19035 300 kHz Synchronous Buck Controller Evaluation Board?
• What the MCP19035 300 kHz Synchronous Buck Controller Evaluation Board Kit
Contains
1.2 SHORT OVERVIEW: MCP19035
The MCP19035 is a highly-featured, highly-integrated, Synchronous Buck Controller in
a space-saving 10-pin DFN 3 x 3 mm 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 on both the high- and low-side devices, 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 include:
• Medium current Point-of-Load converters
• FPGA/DSP power supplies
• Digital Set-Top boxes
• Industrial 24V rails converters
The internal linear voltage regulator (LDO) allows low current loads (for example, PIC
microcontrollers) to be powered directly from this controller without any additional
components.
BOARD USER’S GUIDE
2012 Microchip Technology Inc. DS52099A-page 11
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
C
IN
C
OUT
L
Q1
Q2
MCP19035
HDRV
LDRV
PHASE
BOOT
+V
CC
C
BOOT
C
VCC
+V
OUT
SHDN
V
IN
PWRGD
COMP
FB
R1
R3
C1
R2
C3
R4
C2
+V
IN
ON
OFF
GND
FIGURE 1-1: Typical Application.
1.3 WHAT IS THE MCP19035 300 KHZ SYNCHRONOUS BUCK CONTROLLER EVALUATION BOARD?
The MCP19035 300 kHz Synchronous Buck Controller Evaluation Board is a compact,
highly efficient, step-down voltage regulator that will convert the input voltage rail
(typically 12V) to 1.8V regulated output voltage. The maximum output current for this
step-down converter is 15A. The board demonstrates the capabilities of the MCP19035
300 kHz synchronous buck converter, as well as Microchip’s high-performance power
MOSFET transistors. Test points for various signals are provided for measuring
different parameters of the converter. The evaluation board can be modified to support
output voltages from 0.9V to 3.3V by changing a single resistor.
1.4 WHAT THE MCP19035 30 0 KHZ SYNCHRONOUS BUCK CONTROLLER EVALUATION BOARD KIT CONTAINS
The MCP19035 300 kHz Synchronous Buck Controller Evaluation Board kit includes:
• MCP19035 300 kHz Synchronous Buck Controller Evaluation Board (ADM00434)
• Important Information Sheet
DS52099A-page 12 2012 Microchip Technology Inc.
Chapter 2. Installation and Operation
2.1 INTRODUCTION
The MCP19035 300 kHz Synchronous Buck Controller Evaluation Board 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: 8V to 14V
• Output Voltage: 1.8V (can be adjusted by changing one resistor between 0.9V
and 3.3V)
• Maximum Output Current: 15A
• 91% typical efficiency at 1.8V/15A output and 12V input
• 300 kHz fixed switching frequency
• On-board High Performance Power MOSFET Transistors
• 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 a low-power Standby mode
• Under Voltage Lockout (UVLO) with 4.2V and 3.6V (typical) thresholds
MCP19035 300 KHZ SYNCHRONOUS
BUCK CONTROLLER EVALUATION
BOARD USER’S GUIDE
2.2 GETTING STARTED
The MCP19035 300 kHz Synchronous Buck Controller Evaluation Board is fully
assembled and tested to evaluate and demonstrate the MCP19035 capabilities.
2.2.1 Necessary Instruments and Tools
The list of required instruments and tools include:
• Adjustable DC power supply with 0V – 15V/5 A
• Electronic load with at least 25A 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: they must sustain high current, 5A for the connection
between adjustable DC power supply and board, 15A for the connection between
board and the electronic load
2.2.2 Setup Procedure
To power-up the MCP19035 300 kHz Synchronous Buck Controller Evaluation Board,
the following steps must be completed:
1. Connect the Electronic Load to J2 connector of the demo board; the positive (+)
and negative (-) connector pins are marked on the board silkscreen.
2. Connect the Adjustable DC Power Supply to J1 connector on the demo board;
the positive (+) and negative (-) connector pins are marked on the board silkscreen.
3. The DC voltage supplied by the Adjustable DC Power Supply should be 12V.
range output capability
DC
2012 Microchip Technology Inc. DS52099A-page 13
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
2.2.3 Board Testing
The typical test 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
shown in Appendix C. “Typical Performance Data, Curves and Waveforms”.
FIGURE 2-1: Typical Test Setup.
TABLE 2-1: TEST POINTS DESCRIPTION
Test Point Label Description
TP1, TP8, TP 12, TP15 GND Power GND
TP7, TP16, TP19 SGND Signal GND
TP2 V
TP3 SHDN Shutdown input pull-up resistor
TP4 SHDN Shutdown input
TP5 PGOOD Power Good output
TP6 EXTPGOOD External Pull-up for PGOOD signal
TP9 HIGHDR High-Side MOSFET drive signal
TP10 LOWDR Low-Side MOSFET drive signal
TP11 SW Main switch node
TP13 PREBIAS Pre-bias load point
TP14 V
TP17, TP18 CH A, CH B Signal Injection points f or loop measurement
DS52099A-page 14 2012 Microchip Technology Inc.
IN
OUT
Input voltage
Output Voltage
Installation and Operation
V
OUT
V
REF
R11 R12+
R12
-------------------------- -
=
Where:
V
REF
=0.6V
R11 = 20 k
2.2.3.1 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: OUTPUT VOLTAGE
Do not modify the value of the R11 resistor (20 k), as this will affect the system’s loop
compensation.
Some parameters, including efficiency, overcurrent protection thresholds, and input
and output voltage ripple, can be affected by the modification of the output voltage.
Table 2-2 shows the standard values of R12 resistor for some usual output voltages.
TABLE 2-2: OUTPUT VOLTAGE VERSUS R12 VALUE
V
(V) R12 (k)
OUT
0.9 40.2
130
1.2 20
1.5 13.3
1.8 10
28.45
2.25 7.32
2.5 6.34
3.3 4.42
2012 Microchip Technology Inc. DS52099A-page 15
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
NOTES:
DS52099A-page 16 2012 Microchip Technology Inc.
Appendix A. Schematic and Layouts
A.1 INTRODUCTION
This appendix contains the following schematics and layouts for the
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board:
• Board – Schematic
• Board – Top Silk and Pads
• Board – Top Copper and Silk
• Board – Top Copper
• Board – Mid Layer 1
• Board – Mid Layer 2
• Board – Bottom Copper and Pads
• Board – Bottom Copper, Silk and Pads
MCP19035 300 KHZ SYNCHRONOUS
BUCK CONTROLLER EVALUATION
BOARD USER’S GUIDE
2012 Microchip Technology Inc. DS52099A-page 17
SHDN
1
FB
2
COMP
3
VIN
4
PWRGD
5
VCC
6
LOWDR
7
BOOT
8
PHASE
9
HIGHDR
10
GND
11
U1
MCP19035
D
G
S
Q1
MCP87050
D
G
S
Q2
MCP87022
PGND
PGND
PGND
1
TP15
GND
1
TP14
VOUT
1
TP13
SGND
1
TP17
CH A
1
TP18
CH B
1
TP16
GND
1
T
P19
GND
SGND
SGND
PGOOD
PGND
1
TP2
VIN
PGND
1
TP3
SGND
1
TP4
PGOOD
1
TP5
PGOOD
1
TP6
EXTPGOOD
1
TP9
HIGHDR
1
TP11
SW
1
TP10
LOWDR
1
TP8
GND
PGND
5.1k
R1
100k
R2
5.1k
R8
5.1k
R9
10k
R14
49.9
R10
100k
R7
B0530WS
D1
100
R4
1
TP7
GND
SGND
SGND
PGND
0
NET_TIE_0.5 mm
NT1
1
TP1
GND
PGND
1
TP12
GND
PGND
22uF
C3
22uF
C1
1.5uH/19.5A
L1
10k
R12
750
R13
6.8nF
C4
68pF
C10
2
ED120/2DS
J1
2
ED120/2DS
J2
100uF
C6
100uF
C7
100uF
C8
1uF
C9
0
R3
20k
R11
1uF
C11
4.7uF
0805
C12
2N7002-7-F
Q3
10uF
C2
0.33uF
C5
820pF
C13
7.5k
R5
3.3
R6
1
1
DS52099A-page 18 2012 Microchip Technology Inc.
A.2 BOARD – SCHEMATIC
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
A.3 BOARD – TOP SILK AND PADS
Schematic and Layouts
2012 Microchip Technology Inc. DS52099A-page 19
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
A.4 BOARD – TOP COPPER AND SILK
DS52099A-page 20 2012 Microchip Technology Inc.
A.5 BOARD – TOP COPPER
Schematic and Layouts
2012 Microchip Technology Inc. DS52099A-page 21
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
A.6 BOARD – MID LAYER 1
DS52099A-page 22 2012 Microchip Technology Inc.
A.7 BOARD – MID LAYER 2
Schematic and Layouts
2012 Microchip Technology Inc. DS52099A-page 23
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
A.8 BOARD – BOTTOM COPPER AND PADS
DS52099A-page 24 2012 Microchip Technology Inc.
Schematic and Layouts
A.9 BOARD – BOTTOM COPPER, SILK AND PADS
2012 Microchip Technology Inc. DS52099A-page 25
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
NOTES:
DS52099A-page 26 2012 Microchip Technology Inc.
MCP19035 300 KHZ SYNCHRONOUS
BUCK CONTROLLER EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill of Mater ials
TABLE B-1: BILL OF MATERIALS (BOM)
Qty Reference Description Manufacturer Part Number
4 BUMP Bumpon Hemisphere .44X.20 White 3M SJ-5003 (WHITE)
2 C1, C3 Cap. Cer. 22 µF 25V 10% X7R 1210 Murata Electronics
1 C2 Cap. Cer. 10 µF 25V 10% X7R 121 TDK Corporation C3225X7R1E106K
1 C4 Cap. Cer. 6800 PF 50V 5% NP0 0603 KEMET
1 C5 Cap. Cer. 0.33 µF 16V 10% X7R 0603 Murata Electronics GRM188R71C334KA01D
3 C6, C7, C8 Cap. Cer. 100 µF 6.3V 20% X5R 1210 TDK Corporation C3225X5R0J107M
2 C9, C11 Cap. Cer. 1 µF 35V 10% X7R 0805 TDK Corporation CGA4J3X7R1V105K
1 C10 Cap. Cer. 68 PF 100V 5% NP0 0603 KEMET C0603C680J1GACTU
1 C12 Cap. Cer. 4.7 µF 25V X5R 0805 TDK Corporation C2012X5R1E475K
1 C13 Cap. Cer. 820 PF 50V 5% NP0 0603 KEMET C0603C821J5GACTU
1 D1 Dio de Sch ottk y 0.5A 30V SOD 323 Diodes
2 J1, J2 Terminal Block 5.08 MM vert. two pos. On-Shore
Technology, Inc.
1 L1 Inductor Power 1.5µH 19.5A SMD Wurth
Group
PCB Printed Circuit Bo ard - MCP190 35 300 k Hz
Synchronous Buck Controller Evaluation
Board
1 Q1 High Perfo rmance MOSFET Transistor Microchip
1 Q2 High Perfo rmance MOSFET Transistor Microchip
1 Q3 MOSFET N-Ch. 60V 115 MA SOT-23-3 Diodes Incorporated 2N7002-7-F
3 R1, R8, R9 Res. 5.1kOhm 1/10W 1% 0603 SMD Panasonic
2 R2, R7 Res. 100kOhm 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. 100 Ohm 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1000V
1 R5 Res. 7.50kOHMhm 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF7501V
1 R6 Res. 3.3 Ohm 1/10W 1% 0603 Panasonic - ECG ERJ-3RQF3R3V
1 R10 Res. 49.9 Ohm .25W 1% 0603 SMD Vishay/Dale CRCW060349R9FKEAHP
1 R11 Res. 20k Ohm 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2002V
2 R12, R14 Res. 10k Ohm 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1002V
1 R13 Res. 750 Ohm 1/10W 1% 0603 SMD Vishay/Dale CRCW0603750RFKEA
19 TP1 – TP19 Test Point PC Multi Purpose Black Keystone
1 U1 High Speed Synchro no us Buc k Contro ller Microchip
— 104-00434
Technology Inc.
Technology Inc.
Electronics Corp.
Technology Inc.
®
®
Incorporated B0530WS-7-F
®
Elektronik
®
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.
®
GRM32ER71E226KE15L
C0603C682J5GACTU
ED120/2DS
7443320150
MCP87050-U/MF
MCP87022-U/MF
- ECG ERJ-3EKF5101V
5011
MCP19035-AAABE/MF
2012 Microchip Technology Inc. DS52099A-page 27
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board User’s Guide
NOTES:
DS52099A-page 28 2012 Microchip Technology Inc.
MCP19035 300 KHZ SYNCHRONOUS
40
50
60
70
80
90
100
0 5000 10000 15000
Efficiency (%)
I
OUT
(mA)
V
IN
= 8V
V
IN
= 14V
V
IN
= 12V
BUCK CONTROLLER EVALUATION
BOARD USER’S GUIDE
Appendix C. Typical Performance Data, Curves and Waveforms
C.1 INTRODUCTION
This chapter shows some of the typical performace parameters and curves of the
MCP19035 300 kHz Synchronous Buck Controller Evaluation Board.
TABLE C-1: CONVERTER PARAMETERS
Parameter Value Comments
Input Voltage Range (V) 8 - 14
Output Voltage (V) 1.8 ±2.5% tolerance
Maximum Output Current (A) 15 Steady State output current
Output Voltage Ripple (mV) <30 VIN= 12V, I
Input Voltage Ripple (mV) <300 VIN= 12V, I
Output V oltage Overshoot during Step
Load (mV)
Switching Frequency (kHz) 250 – 3 50 Typical 300 kHz
<100 Step Load 0A to 5A
OUT
OUT
= 15A
= 15A
2012 Microchip Technology Inc. DS52099A-page 29
FIGURE C-1: Efficiency.
Typical Performance Data, Curves and Waveforms
1.79
1.791
1.792
1.793
1.794
1.795
1.796
1.797
1.798
1.799
1.8
0 5000 10000 15000
V
OUT
(V)
I
OUT
(mA)
V
OUT
FIGURE C-2: Load Regulation (VIN=12V).
FIGURE C-3: Output Voltage Ripple/Noise (V
2012 Microchip Technology Inc. DS52099A-page 30
=12V, I
IN
= 10A, BW = 20 MHz).
OUT
Typical Performance Data, Curves and Waveforms
FIGURE C-4: Input Voltage Ripple/Noise (VIN= 12V, I
= 10A, BW = 20 MHz).
OUT
FIGURE C-5: SW (TP11), LDRV (TP10) and HDRV (TP9) signals (V
= 12V, I
IN
OUT
= 10A,
BW = 300 MHz).
2012 Microchip Technology Inc. DS52099A-page 31
Typical Performance Data, Curves and Waveforms
FIGURE C-6: LDRV (TP10) and HDRV (TP9) signals (VIN= 12V, I
= 10A, BW = 300 MHz).
OUT
FIGURE C-7: Dead Times 1 (V
2012 Microchip Technology Inc. DS52099A-page 32
=12V, I
IN
= 1A, BW = 300 MHz).
OUT
Typical Performance Data, Curves and Waveforms
FIGURE C-8: Dead Times 2 (VIN=12V, I
= 1A, BW = 300 MHz).
OUT
FIGURE C-9: The Body Diode Conduction Time (V
2012 Microchip Technology Inc. DS52099A-page 33
=12V, I
IN
=10A, BW=300MHz).
OUT
Typical Performance Data, Curves and Waveforms
FIGURE C-10: Step Load 1 (VIN=12V).
FIGURE C-11: Step Load 2 (V
2012 Microchip Technology Inc. DS52099A-page 34
=12V).
IN
Typical Performance Data, Curves and Waveforms
FIGURE C-12: Power Good Signal (PGOOD).
FIGURE C-13: Soft Start.
2012 Microchip Technology Inc. DS52099A-page 35
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DS52099A-page 36 2012 Microchip Technology Inc.
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