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Maxim Integrated MAXIM001 MGT Quick start guide

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Quick Start Guide
MAXIM001 MGT Module
for Xilinx UltraScale KCU1250 and VCU1287 Evaluation Boards
AN6055: Quick Start Guide
Rev 1 1
MAXIM001 MGT Module
The MAXIM001 MGT Module is a proven application
circuit design that provides the MGTAVCCAUX,
MGTAVCC, and MGTAVTT rails for Xilinx’s Ultra-
Scale™ Virtex® FPGA multigigibit transceivers. It
contains the connectors that allow it to mate directly
to the Xilinx KCU1250 MGT characterization-
evaluation kit. This solution allows the user to
evaluate the MGT performance. The power supplies
are designed to meet the stringent power
requirements necessary to ensure high-quality, high-
speed communication over the MGT rails. The
MAXIM001 MGT module power supplies comprise
a MAX20751 DC-DC controller integrated circuit (IC)
and a VT1697SB smart slave.
UltraScale is a trademark and Virtex is a registered trademark of
Xilinx, Inc.
Features
Meets Xilinx MGT Power Requirements
< 10mV Output Voltage Ripple
MGTAVCC: 1.0V
MGTAVTT: 1.2V
MGTVCCAUX: 1.8V
8.5V to 16V Input Voltage
Supports High Power MGT Rails
20A Output Current Capability per Phase
No Heat Sink Required
Easy to Set Up and Use
No Configuration File Needed
Pin-Strap Configuration
PMBus Control and Telemetry
SMA Connectors for Low-Noise
Measurements
Connectors for Multiple-Rail Evaluation
PMBus Interface for Control and Monitoring
Quick Start Guide
MAXIM001 MGT Module
AN6055: Quick Start Guide
2 Rev 1
Input Voltage
The MAXIM001 is designed to operate with an input voltage between 8.5V and 16V.
Design Requirements
The main power supply requirement for powering MGT rails is a total output voltage ripple less than 10mV. All
three power rails meet the 10mV requirement with an all ceramic output voltage filter. The load transient
requirement of ±3% is achieved. The Xilinx MGT configuration and layout require the MGT Module output
capacitors to be placed on the MGT module rather than near the load on the Xilinx characterization board.
Although this MAXIM001 design meets all MGT rail power requirements, Maxim recommends placing the output
capacitors by the actual load in a customer production design. Doing this improves both output voltage ripple and
load transient response.
Output Voltages
Table 1 shows the preprogrammed output voltages. The output voltages are preset to match the MGT rail
requirements. Note that the 1.8V rail reports an output voltage of 1.5V through the PMBus even though the actual
output voltage is 1.8V. This is normal and is a result of an external voltage divider in the feedback path of this
voltage rail. The actual output voltage is 1.2x the voltage reported through the PMBus.
Table 1. Output Voltages
MGT RAIL
VOLTAGE (V)
CURRENT (A)
MGTAVCC
1.0
17
MGTAVTT
1.2
10
MGTAVCCAUX
1.8
4
SMBus Slave Address
Each voltage rail is preconfigured to allow the user to easily select one of two possible PMBus slave addresses.
The ICs power up at the default slave address without user intervention. The user can select the alternate slave
address by grounding the ALT address pin. Refer to the MAX20751 data sheet for more details on setting the IC’s
address. Table 2 shows the SMBus address settings. If changing the default addresses, ensure that each device
on the bus has a different address.
Table 2. SMBus Address Settings
MGT RAIL
DEFAULT
SMBus
ADDRESS
ALTERNATE
SMBus
ADDRESS
MGTAVCC
0x71
0x70
MGTAVTT
0x73
0x77
MGTAVCCAUX
0x72
0x76
PMBus Telemetry
The MGT Module reports VIN, VOUT, TEMP, IOUT, and POUT through the PMBus. The VOUT reporting
accuracy is 1%, the current reporting accuracy is ±4%
AN6055: Quick Start Guide
Rev 1 3
Hardware Connections
The MGT Module contains two connectors that make it compatible with the Xilinx Vertex board. The two boards
mate by simply aligning the connectors and gently pressing the boards together. Ensure that no power is
applied when mating the connectors.
Figure 1. Top View of MAXIM001 MGT Module with Three Single-Phase MAX20751s
Figure 2. Bottom View of MAXIM001 MGT Module
Quick Start Guide
MAXIM001 MGT Module
AN6055: Quick Start Guide
4 Rev 1
Measured MGT Module Performance
AN6055: Quick Start Guide
Rev 1 5
Quick Start Guide
MAXIM001 MGT Module
AN6055: Quick Start Guide
6 Rev 1
AN6055: Quick Start Guide
Rev 1 7
Quick Start Guide
MAXIM001 MGT Module
AN6055: Quick Start Guide
8 Rev 1
9 AN6055: Quick Start Guide
Rev 1
Ordering Information
PART
QTY
DESCRIPTION
MAXPOWERTOOL002#
1
PowerTool USB-
PMBus Interface
Revision History
REVISION
DESCRIPTION
PAGES CHANGED
0
Initial release
—
1
Added VCU1287
1
/