MaxLinear MxL7218-EVK-2 Manuale utente
Quad MxL7218 140A Multiphase EVK User Manual Revision History
12/7/20 026UMR00 ii
Revision History
Document No. Release Date Change Description
026UMR00 12/7/20 Initial Preliminary Release
Quad MxL7218 140A Multiphase EVK User Manual Table of Contents
12/7/20 026UMR00 iii
Table of Contents
Introduction......................................................................................................................................................... 1
Quick EVK Set Up and Start Up....................................................................................................................................1
Factory Settings ...................................................................................................................................................1
Quick Start Up ......................................................................................................................................................1
Reference Documentation ................................................................................................................................. 3
Ordering Information.......................................................................................................................................... 3
Evaluation Board Overview ............................................................................................................................... 4
Configuration and I/O Interfaces ....................................................................................................................... 5
EXT_CLK, Jumper JP1 .................................................................................................................................................5
RUN, Jumper JP2 .........................................................................................................................................................5
TRACK_CONTROL.......................................................................................................................................................5
PGOOD .........................................................................................................................................................................5
EXTVCC........................................................................................................................................................................5
EXT PULSE...................................................................................................................................................................5
Set-Up Options.................................................................................................................................................... 6
Jumper JP1 CLK ...........................................................................................................................................................6
Jumper JP2 RUN ..........................................................................................................................................................6
Jumpers JP4 - JP8 VOUT SELECT ..............................................................................................................................6
Test Interfaces..................................................................................................................................................... 7
Load Transient Circuit ...................................................................................................................................................7
Performance........................................................................................................................................................ 8
Efficiency .......................................................................................................................................................................8
Load Transient Response .............................................................................................................................................8
Output Ripple ................................................................................................................................................................9
Thermal .........................................................................................................................................................................9
Quad MxL7218 EVK Schematic....................................................................................................................... 10
Quad MxL7218 EVK PCB Layers..................................................................................................................... 14
Quad MxL7218 EVK Bill of Materials .............................................................................................................. 18
Quad MxL7218 140A Multiphase EVK User Manual List of Figures
12/7/20 026UMR00 iv
List of Figures
Figure 1: Monitoring VIN and VOUT.........................................................................................................................................2
Figure 2: Top View of MxL7218 140A Multiphase EVK..........................................................................................................3
Figure 3: Quad MxL7218 140A Multiphase EVK Block Diagram ...........................................................................................4
Figure 4: Load Transient Circuit .............................................................................................................................................7
Figure 5: Measured Efficiency (VIN = 12V) .............................................................................................................................8
Figure 6: Load Transient Response, VIN = 12V, VOUT = 1V, 0A to 35A Load Step, fSW = 400kHz .......................................8
Figure 7: Measured Output Voltage Ripple (VIN = 12V, VOUT = 1V, Load = 140A, fSW = 400kHz)........................................9
Figure 8: Thermal Capture (VIN = 12V, VOUT = 1V, Load = 140A, fSW = 400kHz, 400LFM)..................................................9
Figure 9: EVK Schematic .....................................................................................................................................................10
Figure 10: EVK Schematic, Continued .................................................................................................................................11
Figure 11: EVK Schematic, Continued .................................................................................................................................12
Figure 12: EVK Schematic, Continued .................................................................................................................................13
Figure 13: EVK PCB Silkscreen Top ....................................................................................................................................14
Figure 14: EVK PCB Layer 1................................................................................................................................................14
Figure 15: EVK PCB Layer 2................................................................................................................................................15
Figure 16: EVK PCB Layer 3................................................................................................................................................15
Figure 17: EVK PCB Layer 4................................................................................................................................................16
Figure 18: EVK PCB Layer 5................................................................................................................................................16
Figure 19: EVK PCB Layer 6................................................................................................................................................17
Figure 20: EVK PCB Silkscreen Bottom...............................................................................................................................17
Quad MxL7218 140A Multiphase EVK User Manual List of Tables
12/7/20 026UMR00 v
List of Tables
Table 1: Evaluation Board Ordering Part Number ................................................................................................ 3
Table 2: Factory Settings...................................................................................................................................... 6
Table 3: JP1 Options ............................................................................................................................................ 6
Table 4: JP2 Options ............................................................................................................................................ 6
Table 5: JP4 - JP8 Options................................................................................................................................... 6
Table 6: EVK Bill of Materials ............................................................................................................................. 18
Quad MxL7218 140A Multiphase EVK User Manual Introduction
12/7/20 026UMR00 1
Introduction
The Quad MxL7218 140A Multiphase Evaluation Board provides a platform to evaluate the features and performance of
four MxL7218 Power Modules connected in parallel to supply up to a 140A load. Each MxL7218 is a dual 18A Power
Module which are optimized for powering Telecom, Networking and Industrial equipment. This manual covers both the BGA
and LGA evaluation boards versions of this 140A multiphase application.
Quick EVK Set Up and Start Up
Factory Settings
In addition to utilizing the 4.5V to 15V input voltage range of the MxL7218’s and the 140A maximum load current rating
capabilities of using the four MxL7218 Power Modules together, the evaluation board has been set up with the factory
default configurations shown below for quick set up and operation. Do not exceed the EVK maximum load current
rating.
The factory default configuration (Table 2) for the Quad MxL7218 Evaluation Board is:
■VIN = 4.5V to 15V
■VOUT = 1.0V ±1.5%. For other VOUT see Jumpers JP4 -
JP8 VOUT SELECT.
■IOUT = 0A to 140A
■400kHz switching frequency
■Run is enabled for both channels of all 4 of the
MxL7218’s (all 8 channels). See RUN, Jumper JP2.
■Continuous current mode using internal clock. To use
an external clock, see EXT_CLK, Jumper JP1
■One pin output voltage ramp up and down tracking
programmability
■A 6.5ms soft-start is selected for all channels
■Sensing diode biasing at 100µA for internal
temperature sense
Quick Start Up
To quickly see the regulator in operation:
1. Use the factory settings and default configuration. If
other settings or components are desired, apply them
before the next steps and see Set-Up Options for more.
2. With a power supply turned off and within a VIN
specification of 4.5V to 15V (12V typical), connect it to
VIN and GND with short, thick leads. Use test pins
VIN+ and VIN- to monitor VIN and GND respectively.
See locations in Figure 1.
3. For the output, connect a meter and electronic load
initially set to 0A, that will be no more than the above
maximum IOUT (140A ), to VOUT and GND with short /
thick leads capable of this current. See setup and
locations in Figure 1.
4. Turn on the power supply and check VOUT. Check to
make sure that JP2 is on the ON position. The EVK will
power up and (factory default) regulate the output at 1V
±1.5% (0.985V to 1.015V).
5. Set or vary the load (do not exceed the maximum IOUT)
and check VOUT and other desired performance levels
such as regulation and efficiency.
See Configuration and I/O Interfaces and Load Transient
Circuit for more on testing and monitoring.
Quad MxL7218 140A Multiphase EVK User Manual Quick EVK Set Up and Start Up
12/7/20 026UMR00 2
Figure 1: Monitoring VIN and VOUT
VOUT
A
Load V
+-
V
+-
A+-
VIN
Quad MxL7218 140A Multiphase EVK User Manual Reference Documentation
12/7/20 026UMR00 3
Figure 2: Top View of MxL7218 140A Multiphase EVK
Reference Documentation
Please refer to the MxL7218 Data Sheet for additional information about the MxL7218. The datasheet includes a full list of
IC features, pinout, pin descriptions, typical performance characteristics and external component calculations. This manual
is meant to be used in conjunction with the datasheet.
This manual provides Quad MxL7218 EVK Schematic, Quad MxL7218 EVK PCB Layers and Quad MxL7218 EVK Bill of
Materials that can be utilized to assist in your board design. The schematics are also available on the MxL7218 product
page.
Ordering Information
1. Refer to www.maxlinear.com/MxL7218 for most up-to-date Ordering Information.
Table 1: Evaluation Board Ordering Part Number(1)
Power Module Evaluation Board Description
MxL7218-ABA-T MxL7218-EVK-2 Quad MxL7218 BGA Power Module Multiphase EVK
Quad MxL7218 140A Multiphase EVK User Manual Evaluation Board Overview
12/7/20 026UMR00 4
Evaluation Board Overview
The block diagram shown in Figure 3 illustrates the 7 MxL7218 channels connected in parallel with the 8th channel as the
master and the connection points for VIN, VOUT, and VOUT2. Also represented are the CLKOUT to MODE_PLLIN
connections between the 4 MxL7218 ICs.
VOUT and VOUT2 connected via R22, R23, R24 and R26
VFB of all 8 channels connected
RUN of all 8 channels connected and connected to JP2
TRACK of all 8 channels connected and connected to TRACK_CONTROL point on board
PGOOD of all 8 channels (with pullups) connected and connected to PGOOD point on board
Figure 3: Quad MxL7218 140A Multiphase EVK Block Diagram
A
A
V
V
+ -
+ -
+ -
VIN
Load VOUT
VIN
VOUT
VOUT2
MxL7218
MxL7218
MxL7218
MxL7218
0 - 140A
Quad MxL7218 140A Multiphase EVK User Manual Configuration and I/O Interfaces
12/7/20 026UMR00 5
Configuration and I/O Interfaces
EXT_CLK, Jumper JP1
Jumper J1 provides an option to connect and synchronize to an external clock or use an internal clock (default). See
EXT_CLK, Jumper JP1.
RUN, Jumper JP2
Jumper JP2 enables (ON) or disables (OFF) all 8 channels. See RUN, Jumper JP2.
TRACK_CONTROL
The board’s output voltage tracks the voltage on the TRACK_CONTROL test point when applied.
PGOOD
A PGOOD test point is provided for all 8 channels. PGOOD signals are tied to INTVCC through 10kΩ resistors.
EXTVCC
A connection point is provided to inject EXTVCC, if desired.
EXT PULSE
Used to test load transients. See Load Transient Circuit.
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