MaxLinear MxL7218 User manual
MxL7218 18A Dual Phase EVB User Manual Revision History
10/5/20 020UMR02 ii
Revision History
Document No. Release Date Change Description
020UMR02 10/5/20 Initial release.
MxL7218 18A Dual Phase EVB User Manual Table of Contents
10/5/20 020UMR02 iii
Table of Contents
Introduction......................................................................................................................................................... 1
Quick EVB Set Up and Start Up....................................................................................................................................1
Factory Settings ...................................................................................................................................................1
Quick Start Up ......................................................................................................................................................1
Reference Documentation ................................................................................................................................. 4
Ordering Information.......................................................................................................................................... 4
Evaluation Board Overview ............................................................................................................................... 5
Configuration and I/O Interfaces ....................................................................................................................... 6
MODE............................................................................................................................................................................6
RUN1, RUN2.................................................................................................................................................................6
TRACK1 SEL, TRACK2 SEL ........................................................................................................................................6
PHASMD .......................................................................................................................................................................6
EXTVCC........................................................................................................................................................................6
TEMP ............................................................................................................................................................................6
PGOOD1, PGOOD2......................................................................................................................................................6
SW1, SW2.....................................................................................................................................................................6
Set-Up Options.................................................................................................................................................... 7
Jumper J44 MODE........................................................................................................................................................7
Jumpers J30 RUN1 and J29 RUN2...............................................................................................................................7
Jumper J26 TRACK1 SEL.............................................................................................................................................7
Jumper J25 TRACK2 SEL.............................................................................................................................................8
Jumper J45 PHASMD ...................................................................................................................................................8
Test Interfaces..................................................................................................................................................... 9
Load Transient Circuit ...................................................................................................................................................9
MxL7218 EVB Mode Selection....................................................................................................................................10
Performance...................................................................................................................................................... 12
Efficiency .....................................................................................................................................................................12
Load Transient Response ...........................................................................................................................................13
Ripple ..........................................................................................................................................................................14
Thermal .......................................................................................................................................................................15
MxL7218EVB Schematic .................................................................................................................................. 16
MxL7218EVB PCB Layers ................................................................................................................................ 19
MxL7218EVB Bill of Materials.......................................................................................................................... 21
MxL7218 18A Dual Phase EVB User Manual List of Figures
10/5/20 020UMR02 iv
List of Figures
Figure 1: Monitoring VIN and VOUT.........................................................................................................................................2
Figure 2: Top View of MxL7218 18A Dual Phase BGA EVB..................................................................................................3
Figure 3: Block Diagram MxL7218 Two Channel EVB...........................................................................................................5
Figure 4: Load Transient Circuit .............................................................................................................................................9
Figure 5: Mode 1 Block Diagram ..........................................................................................................................................11
Figure 6: Mode 2 Block Diagram ..........................................................................................................................................11
Figure 7: Mode 3 Block Diagram ..........................................................................................................................................11
Figure 8: Mode 4 Block Diagram ..........................................................................................................................................11
Figure 9: Mode 5 Block Diagram ..........................................................................................................................................11
Figure 10: Mode 6 Block Diagram ........................................................................................................................................11
Figure 11: Channel 1 Measured Efficiency (VOUT = 1.5V, fSW = 500kHz, Ch 2 Disabled)...................................................12
Figure 12: Channel 2 Measured Efficiency (VOUT = 1.0V, fSW = 500kHz, Ch 1 Disabled)...................................................12
Figure 13: Channel 1 Load Transient Response (VOUT = 1.5V, VIN = 12V).........................................................................13
Figure 14: Channel 2 Load Transient Response (VOUT = 1.0V, VIN = 12V).........................................................................13
Figure 15: Channel 1 Output Voltage Ripple (VIN = 12V, VOUT = 1.5V, Load = 18A, 500kHz) ............................................14
Figure 16: Channel 2 Output Voltage Ripple (VIN = 12V, VOUT = 1V, Load = 18A, 500kHz) ...............................................14
Figure 17: Thermal Image, No Airflow..................................................................................................................................15
Figure 18: EVB Schematic ...................................................................................................................................................16
Figure 19: EVB Schematic, Continued .................................................................................................................................17
Figure 20: EVB Schematic, Continued .................................................................................................................................18
Figure 21: EVB PCB BGA Silkscreen Top ...........................................................................................................................19
Figure 22: EVB PCB BGA Layer 1 .......................................................................................................................................19
Figure 23: EVB PCB BGA Layer 2 .......................................................................................................................................19
Figure 24: EVB PCB BGA Layer 3 .......................................................................................................................................19
Figure 25: EVB PCB BGA Layer 4 .......................................................................................................................................20
Figure 26: EVB PCB BGA Layer 5 .......................................................................................................................................20
Figure 27: EVB PCB BGA Layer 6 .......................................................................................................................................20
Figure 28: EVB PCB BGA Silkscreen Bottom ......................................................................................................................20
MxL7218 18A Dual Phase EVB User Manual List of Tables
10/5/20 020UMR02 v
List of Tables
Table 1: Evaluation Board Ordering Part Number..................................................................................................................4
Table 2: Factory Settings........................................................................................................................................................7
Table 3: J44 Options ..............................................................................................................................................................7
Table 4: J30, J29 Options.......................................................................................................................................................7
Table 5: J26 Options ..............................................................................................................................................................7
Table 6: J25 Options ..............................................................................................................................................................8
Table 7: J45 Options ..............................................................................................................................................................8
Table 8: Board Stuffing for Operation Mode Selection .........................................................................................................10
Table 9: EVB BGA Bill of Materials ......................................................................................................................................21
MxL7218 18A Dual Phase EVB User Manual Introduction
10/5/20 020UMR02 1
Introduction
The MxL7218 evaluation board provides a platform to evaluate the features and performance of the MxL7218. The
MxL7218 is a dual 18A Power Module optimized for powering Telecom, Networking and Industrial equipment. This EVB
board supports 3 options: MxL7225, MxL7225-1, and MxL7218. This manual covers the 18A Dual Phase BGA Evaluation
Board for the MxL7218 Power Module.
Quick EVB Set Up and Start Up
Factory Settings
In addition to utilizing the 4.5V to 15V input voltage range and dual 18A maximum load current rating capabilities of the
MxL7218 Power Module, the Evaluation Board has been set up with the factory default configurations shown below for
quick set up and operation. Do not exceed the EVB maximum load current rating.
The factory default configuration (Table 2) for the MxL7218 Evaluation Board is:
■VOUT1 = 1.5V ±1.5%
■VOUT2 = 1.0V ±1.5%
■500kHz Switching Frequency
■CCM mode. For other modes, see Jumper J44 MODE.
■Run is enabled for both channels. See Jumpers J30
RUN1 and J29 RUN2.
■Soft-start is selected for both channels. See Jumper
J26 TRACK1 SEL and Jumper J25 TRACK2 SEL.
■CLKOUT phase is 90 degrees, see Jumper J45
PHASMD.
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. Connect a turned-off power supply that is within a VIN
specification of 4.5V to 15V, (12V typical) 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 channel 1 output, connect an electronic load
initially set to 0A, that will be no more than the above
maximum IOUT (18A ), to VOUT1 and GND with short /
thick leads. Use test pins VOUT1 (J52) and
VOUT1_GND (J60) to monitor VOUT1 and GND
respectively. See locations in Figure 1.
4. For the channel 2 output, connect an electronic load
initially set to 0A, that will be no more than the above
maximum IOUT (18A ), to VOUT2 and GND with short,
thick leads. Use test pins VOUT2 (J53) and
VOUT2_GND (J61) to monitor VOUT2 and GND
respectively. See locations in Figure 1.
5. Turn on the power supply and check VOUT of both
channels. The EVB will power up and (factory default)
regulate the channel 1 output at 1.5V ±1.5% (1.4775V
to 1.5225V) and channel 2 output at 1.0V ±1.5%
(0.985V to 1.015V). Output ripple should bemeasured
across the output capacitors for each channel: C8 for
VOUT1 and C22 for VOUT2. The test points J52 and
J53 can be used to monitor the VOUT1 and VOUT2
outputs, respectively.
6. 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. For Single Rail
Dual Phase 36A Operation and to vary VOUT see MxL7218
EVB Mode Selection.
MxL7218 18A Dual Phase EVB User Manual Quick EVB Set Up and Start Up
10/5/20 020UMR02 2
Figure 1: Monitoring VIN and VOUT
A
-+VIN
V
+
-
V
+-
Load Load
AA
+
-+-
V
+-
MxL7218 18A Dual Phase EVB User Manual Quick EVB Set Up and Start Up
10/5/20 020UMR02 3
Figure 2: Top View of MxL7218 18A Dual Phase BGA EVB
MxL7218 18A Dual Phase EVB User Manual Reference Documentation
10/5/20 020UMR02 4
Reference Documentation
Please refer to the MxL7218 Data Sheet for additional information about the MxL7218, including efficiency curves for this
configuration with VIN = 12V. The datasheet also 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 EVB schematics, PCB layout and 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
Power Module Evaluation Board Description
MxL7218-ABA-T MxL7218-EVK-1 MxL7218 BGA Evaluation Board, Single Device, Dual Output
MxL7218 18A Dual Phase EVB User Manual Evaluation Board Overview
10/5/20 020UMR02 5
Evaluation Board Overview
The block diagram shown in Figure 3 illustrates the connection points for the VIN, VOUT1, VOUT2, TRACK, MODE_PLL
and RUN pins.
Figure 3: Block Diagram MxL7218 Two Channel EVB
VOUT1
VOUT2
PHASMD
RUN2
TRACK2
MODE
RUN1
TRACK1
VIN
TRACK1
SELECT
JUMPER
(J26)
RUN1
SELECT
JUMPER
(J30)
MODE
SELECT
JUMPER
(J44)
TRACK2
SELECT
JUMPER
(J25)
RUN2
SELECT
JUMPER
(J29)
PHASMD
SELECT
JUMPER
(J45)
OUTPUT
CONFIG
OPTION
DIFF
SENSE
OPTION
J6
VOUT1
CONNECTOR
J16
VOUT2
CONNECTOR
J58
IOSTEP
CONNECTOR
J16
VOUT2
CONNECTOR
J6
VOUT1
CONNECTOR
VIN
CONNECTOR
J9
MxL7218
VOUT1 VOUT2
TRANSIENT LOAD
CIRCUIT
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