MAXLINEAR XR77103-A1R0 Universal PMIC 3 Output Buck Regulator User Manual

MAXLINEAR XR77103-A1R0 Universal PMIC 3 Output Buck Regulator User Manual

Revision History

Document No.

| Release Date|

Change Description

---|---|---
010-A1R0UMR00| March 10, 2022| Updated:

• “Quick Set Up – Factory Settings” section.
• “Simplified Block Diagram, XR77103-A1R0 EVB” figure.
• “Jumper J8 Pull Up Options for the PGOOD Pin” table.
• “XR77103EVB-A1R0 Schematic” figure.
• “XR77103EVB-A1R0 Bill of Materials” table.

Removed:

• “VOUT Programming” section.

1A| 4/26/16| Initial release of document.

Introduction

The XR77103-A1R0 evaluation board provides a platform to evaluate the features and performance of the XR77103-A1R0 Universal PMIC 3 Output Buck Regulator. The XR77103-A1R0 output voltages are set via an external resistor divider down to 0.8V with a 4.5V to 14V input voltage range, and it is packaged in a 4mm x 4mm TQFN.

Quick EVB Set Up and Start Up

Factory Settings

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

• VIN = 5.5V to 14V, optimized for a 12V input rail.
• Maximum IOUT per channel is 2A.
• 1MHz 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.
   
   Figure 1: Connecting and Monitoring VIN and VOUT

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 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.
   

4. Turn on the 12V power supply and check VOUT. The EVB powers up and regulates the enabled outputs at 3.3V (Ch1), 1.8V (Ch2) and 2.5V (Ch3) (factory default settings). PGOOD is asserted active high once sequencing is done, outputs are in regulation, and 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”.

Table 1: Jumper Connections for VIN, VOUT and PGND

1. Factory default: jumpers installed.

Figure 2: Top View of XR77103-A1R0, REV2.0

Reference Documentation

For additional information, refer to the XR77103-A1R0 data sheet, including a full list of IC features, pinout, pin descriptions, typical performance characteristics, and external component calculations.

This manual provides the EVB schematics (“XR77103EVBA1R0 Schematic”), the PCB layout (“XR77103EVB-A1R0 PCB Layers”) and the bill of materials (“XR77103EVB- A1R0 Bill of Materials” ) that you can use on your board design. For more information about the schematics, go to www.maxlinear.com/XR77103-A1R0.

Ordering Information

Table 2: Evaluation Board Ordering Part Number

Evaluation Board

| Board Description
---|---
XR77103EVB-A1R0|

XR77103-A1R0 evaluation board.

Note: For the most up-to-date information, go to www.maxlinear.com/XR77103-A1R0.

Evaluation Board Overview

The XR77103-A1R0 EVB block diagram is shown in Figure 3.

Figure 3: Simplified Block Diagram, XR77103-A1R0 EVB

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

Test Point

| Function
---|---
TP1|

LX3

TP2

| PGOOD
TP3|

COMP3

TP4

| COMP1
TP5|

COMP2

TP6

| LX1
TP7|

LX7

TP8

|

VIN

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

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-A1R0 data sheet.

Table 4: Factory Settings

Jumper

| Factory Setting|

Description

---|---|---
EN Pin
J3| Jumper 1-2| EN pin is tied to VCC and channels are enabled at power up.
PGOOD Pin
J8| Jumper 1-2| PGOOD is pulled up to VCC.
5V Operation
J11| No jumper| LDO output is not tied to VIN.
VIN Connection to Individual Channels
J14, J20, J24| Jumpers installed| VIN is connected to VIN1, VIN2, and VIN3.
SYNC Pin
J15| No jumper| SYNC is not tied to GND on the board.

Jumper J3

Table 5: Jumper J3 Options for the EN Pin

Jumper Options

|

Description

---|---
Jumper 1-2 (default)| The EN (enable) pin is tied to VCC and channels are enabled at power up.
Jumper 2-3| The EN (enable) pin is tied to GND, permanently disabling the channels.
No jumper| The jumper is open, allowing EN to be controlled external to the board.

Jumper J8

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

Jumper Options

|

Description

---|---
Jumper 1-2 (default)| PGOOD is pulled up to the VCC pin.
No jumper| PGOOD is not pulled up by this jumper.

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 respectively. Factory 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 not 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.

XR77103EVB-A1R0 Schematic

MAXLINEAR XR77103-A1R0 Universal PMIC 3 Output Buck Regulator User Manual

XR77103EVB-A1R0 PCB Layers

Figure 5: Silkscreen Top

Figure 6: Assembly Top/Layer 1

Figure 7: Layer 2

Figure 8: Layer 3

_
Figure 9: Assembly Bottom_

XR77103EVB-A1R0 Bill of Materials

Table 8: XR77103EVB-A1R0 Bill of Materials

Item| Qty| Reference Designator| Component| Manufacturer/ Part Number| Package Size
---|---|---|---|---|---
1| 1| PCB| XR77103 Evaluation Board| MaxLinear|
2| 4| C3, C27, C29, C31| CAP CER 22uF 16V X5R 1206 10%| Murata GRM31CR61C226KE15K| 1206
3| 3| C5, C21, C22| CAP CER 47nF 50V X7R 10%| Murata GRM188R71H473KA61D| 0603
4| 5| C6, C7, C10, C13, C18| CAP CER 4.7uF 25V X7R 10%| Murata GRM21BR71E475KA73L| 0805
5| 4| C8, C11, C16, C17| CAP CER 1nF 50V X7R 10%| Murata GRM188R71H102KA01D| 0603
6| 1| C12| CAP CER 1uF, 10V, X7R, 10%| Murata GRM188R71A105KA61D| 0603
7| 6| R4, R6, R13, R14, R27, R28| Resistor 0Ω,1/10W, SMD| Panasonic
ERJ-3GEY0R00V| 0603
8| 4| R7, R8, R11, R12| Resistor 10.0kΩ, 1/10W, 1%, SMD| Panasonic
ERJ-3EFK1002V| 0603
9| 1| F1| Fuse Board Mount 3.5A, 63VDC| Vishay MFU1206FF03500P100| 1206
10| 20| J1, J4, J5, J6, J7, J10, J12, J13, J16, J18, J21, J23, J25, J29, J31, J33, J35, J36, J38, J39| Header 1-pin| Wurth Elektronik 61300111121| 2.54mm
11| 2| J3, J8| Header 3-pin| Wurth Elektronik 61300311121| 2.54mm
12| 5| J11, J14, J15, J20, J24| Jumper 2-pin| Wurth Elektronik 61300211121| 2.54mm
13| 2| L1, L3| Inductor 3.3µH, 6A, 30mΩ, SMD| Vishay IHLP2525CZER3R3M01| 6.86 x 6.47mm
14| 1| L2| Inductor 1.5µH, 9A, 15mΩ, SMD| Vishay IHLP2525CZER1R5M01| 6.47 x 6.47mm
15| 1| U1| Universal PMIC 3 Output Buck Regulator| MaxLinear XR77103ELBTR- A1R0| 4mm x 4mm

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References

• XR76108 - MaxLinear
• XR76117 - MaxLinear
• Home - MaxLinear
• XR77103 - MaxLinear
• XR77103-A0R5 - MaxLinear
• XR77103-A1R0 - MaxLinear

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