Maxlinear Xr77103-moca Universal Pmic 3 Output Buck Regulator User Manual

ENVISIONING • EMPOWERING • EXCELLING
XR77103-MoCA Universal PMIC 3 Output Buck Regulator
EVB User Manual

Revision History

Introduction

The XR77103-MoCA PMIC is designed to power MaxLinear’s MoCA 2.0 MxL370x and MoCA 2.5 MxL371x along with a single port Ethernet PHY such as the GPY241 device. It features three high-efficiency synchronous buck regulators with integrated power switches and a sequencing engine to provide the 0.9V, 1.8V, and 3.3V rails of the MoCA SoC. The 0.9V core rail can supply the 3A peaks demanded by the SoC and is compatible with the SoC DVS control.
The XR77103-MoCA can operate with 5V, 9V, and 12V powered systems with minimal required external components. The XR77103-MoCA is also packaged in a 4x4mm QGN which provides the smallest size solution possible.

Quick EVB Set Up and Start-Up

Factory Settings

The evaluation board has been set up with the following factory default configuration for quick setup and operation:

• VIN = 5.5V to 14V, optimized for a 12V input rail.
• The maximum IOUT per channel is 2A.
• Hz Switching frequency.
• Two channels may be paralleled for output currents up to 5A peak and 4A steady-state (however additional hardware modification is required for parallel operation).
• Low power spectral density (PSM) mode operation enabled.

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. For more information, see “System Set-Up” on page 5 for more.
2. Connect a turned-off power supply that is within the above VIN specification (from 5.5V to 14V, 12V typical) to VIN+ and VIN- with short and thick leads. Use test pins EXT. VIN (J39) and AGND (J7) to connect and monitor VIN+ and VIN- respectively. See locations in Figure 1 on page 2.
3. Initially set to 0A, connect electronic loads to each desired channel that will be no more than the maximum IOUT (2A) to VOUTx and PGNDx (where x = the channel number) with short and thick leads. Use test pins in Table 1 on page 1 to connect and monitor VOUTx and PGNDx respectively. See locations in Figure 1 on page 2. For all channels with the electronic load connected, ensure that the respective VIN jumper is installed per Table 1 on page 1.
4. Turn on the 12V power supply and check VOUT. The EVB powers up and regulate the enabled outputs at 0.9V (Ch1), 1.8V (Ch2) and 3.3V (Ch3) (factory default settings). PGOOD is asserted active high once sequencing is done, outputs are in regulation, and the reset timer expires.
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. For more information about monitoring, see “I/O and Test Points” on page 4.

Table 1: Jumper Connections for VIN, VOUT and PGND

1. Factory default: jumpers installed.

Figure 1: Connecting and Monitoring VIN and VOUT

Figure 2: Top View of XR77103-MoCA

Reference Documentation

For additional information, refer to the XR77103-MoCA datasheet, including a full list of IC features, pinout, pin descriptions, typical performance characteristics, and external component calculations.
This manual provides the EVB schematics (“XR77103MoCA Schematic” on page 7 ), the PCB layout (“XR77103MoCA Schematic” on page 7 ), and the bill of materials (“XR77103-MoCA Bill of Materials” on page 10 ) that you can use on your board design. For more information about the schematics, go to www.maxlinear.com/XR77103-MoCA.

Ordering Information

Table 2: Evaluation Board Ordering Part Number

Note: For the most up-to-date information, go to www.maxlinear.com/XR77103-MoCA.

Evaluation Board Overview

The XR77103-MoCA block diagram is shown in Figure 3.

Figure 3: Simplified Block Diagram, XR77103-MoCA

I/O and Test Points

VIN, LX, and PGOOD Test Points

Test points are available for VIN (TP8), the LX switching nodes (TP6 for LX1, TP7 for LX2, and TP1 for LX3), the compensation pins (TP4 for COMP1, TP5 for COMP2, TP3 for COMP3), and PGOOD (TP2) for monitoring.

Table 3: Test Points

The PGOOD output can be used externally. For more information about PGOOD options, see “Jumper J8” on page 5.

System Set-Up

Table 4 lists a summary of the jumpers and factory settings to configure the EVB for operation. For additional information, refer to the XR77103-MoCA data sheet (206DS).

Table 4: Factory Settings

 Jumper J3

Table 5: Jumper J3 Options for the EN Pin

Jumper J8

Table 6: Jumper J8 Pull Up Options for the PGOOD Pin

Jumper J11

For operation from a 5V rail, it is required that the LDO output is connected to VIN, which can be accomplished by populating J11. This enhances the operation of the drivers for VIN < 5V.
Important: Remove J11 for operation at higher VIN. The board also has Zener diode placeholders which can be installed to protect the IC if higher VIN is accidentally applied.

Table 7: Jumper J11 and Operation from a 5V Rail

Jumpers J14, J20 and J24

Jumpers J14, J20, and J24 are available to connect or disconnect VIN from VIN1, VIN2, and VIN3 respectivelyFactory default is VIN is connected to VIN1, VIN2, and VIN3.

Jumper J15

Jumper J15 is available to ground SYNC. Factory default is that the SYNC pin is grounded on the board. When not grounded, the SYNC pin may be connected and synchronized to an external clock in applications where EMI control is critical.

XR77103-MoCA Schematic

Figure 4: XR77103-MoCA Schematic

XR77103-MoCA PCB Layers

Figure 5: Silkscreen Top	Figure 6: Assembly Top/Layer 1
Figure 7: Layer 2	Figure 8: Layer 3
Figure 9: Assembly Bottom

XR77103-MoCA Bill of Materials

Table 8: XR77103MoCA Bill of Materials

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References

• MxL7213 - MaxLinear
• XR76108 - MaxLinear
• XR76117 - MaxLinear
• XR76203 - MaxLinear
• XR77103-MoCA - MaxLinear
• XR77103 - MaxLinear
• XR77103-A0R5 - MaxLinear
• XR77103-MoCA - MaxLinear