MaxLinear MxL7704 Series User manual

MxL7704
Evaluation Board Manual
• www.maxlinear .com

Revision History
Revision Release Date Change Description
1A 2/28/18 Initial Release
MxL7704 EVB Manual Revision History
2/28/18 Rev 1A ii

Table of Contents
MxL7704 EVB Manual Table of Contents
2/28/18 iii
Introduction.................................................................................................................................1
Ordering Information..................................................................................................................1
Evaluation Board Overview.......................................................................................................2
System Set-Up .................................................................................................................................. 2
Powering Up the Evaluation Board................................................................................................. 3
Monitoring or Testing VOUT .......................................................................................................................................... 3
Typical Output Transient Response................................................................................................ 4
Pin Conguration .......................................................................................................................8
MxL7704-A-EVB Schematic.......................................................................................................9
MxL7704-X-EVB Schematic .....................................................................................................10
MxL7704 EVB PCB Layers....................................................................................................... 11
MxL7704 EVB Bill of Materials ................................................................................................17

List of Tables
MxL7704 EVB Manual List of Tables
iv2/28/18
Table 1: Evaluation Board Ordering Part Numbers ...................................................................... 1
Table 2: Factory Settings.............................................................................................................. 2
Table 3: MxL7704-A-EVB Bill of Materials.................................................................................. 13
Table 4: MxL7704-X-EVB Bill of Materials.................................................................................. 14

List of Figures
MxL7704 EVB Manual List of Figures
v2/28/18
Figure 1: Top View of MxL7704-A EVB ........................................................................................ 1
Figure 2: Top View of MxL7704-X EVB ........................................................................................ 1
Figure 3: Block Diagram MxL7704 EVB....................................................................................... 2
Figure 4: VIN Connection.............................................................................................................. 3
Figure 5: 3.3V Output Transient Response on Channel 1............................................................ 4
Figure 6: 1.8V Output Transient Response on Channel 2............................................................ 5
Figure 7: 1.35V Output Transient Response on Channel 3.......................................................... 5
Figure 8: MxL7704-AQB 1.2V Output Transient Response on Channel 4 ................................... 6
Figure 9: MxL7704-XQB 0.85V Output Transient Response on Channel 4 ................................. 6
Figure 10: MxL7704-AQB Power-Up Sequencing........................................................................ 7
Figure 11: MxL7704-AQB Power-Down Sequencing ................................................................... 7
Figure 12: MxL7704-XQB Power-Up Sequencing........................................................................ 7
Figure 13: MxL7704-XQB Power-Down Sequencing ................................................................... 7
Figure 14: Pin Conguration.........................................................................................................8
Figure 15: MxL7704-A-EVB Schematic........................................................................................ 9
Figure 16: MxL7704-X-EVB Schematic...................................................................................... 10
Figure 17: EVB PCB, Top View .................................................................................................. 11
Figure 18: EVB PCB Layer 2, Ground Plane..............................................................................12
Figure 19: EVB PCB Layer 3, Signal Plane................................................................................13
Figure 20: EVB PCB, Layer 4 Signal Plane................................................................................14
Figure 21: EVB PCB, Layer 5 Ground Planes............................................................................ 15
Figure 22: EVB PCB, Bottom View.............................................................................................16

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Introduction / Ordering Information
Introduction
The MxL7704 evaluation board provides a platform to evaluate the features and performance of the
MxL7704. The MxL7704 is a five output Universal PMIC optimized for powering low power FPGAs, DSPs,
and microprocessors from 5V inputs.
The MxL7704 power module and evaluation board come in two configurations which are summarized in
Table 1.
Please refer to the MxL7704 datasheet for additional information about the MxL7704.
Ordering Information
Table 1: Evaluation Board Ordering Part Numbers(1)
PMIC Evaluation Board Channel Output Voltage (V) Switching Frequency (MHz)
MxL7704-AQB-T MxL7704-A-EVB
VOUT1 3.3
1.5
VOUT2 1.8
VOUT3 1.35
VOUT4 1.2
MxL7704-XQB-T MxL7704-X-EVB
VOUT1 3.3
1
VOUT2 1.8
VOUT3 1.35
VOUT4 0.85
NOTE:
1. Refer to www.exar.com/MxL7704 for most up-to-date Ordering Information
Figure 1: Top View of MxL7704-A-EVB Figure 2: Top View of MxL7704-X-EVB

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Evaluation Board Overview
The block diagram shown in Figure 3 illustrates the connection points.
Figure 3: Block Diagram MxL7704 EVB
I2C
MxL7704
PGOOD
VOUT_LDO
SEQ EN
VOUT2
VOUT3 VOUT1
GLOBAL EN
ADC IN
VOUT4
VIN
System Set-Up
Jumpers are factory installed per Table 2 to configure the EVB for operation. Jumper and testing options
are described in the next sections. Refer to the product data sheet for additional information.
Table 2: Factory Settings
Jumper Factory Setting Description
Digi_Pwr to P5V J6, Jumper 1-2 Enables all pull-up resistors.
Overview / Set-Up

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Set Up
Powering Up the Evaluation Board
■Connect P2 (VIN+) and P3 (VIN-) to a 5V power supply. See Note A.
■Turn on the power supply. The EVB will power up and regulate the outputs as follows:
Channel 1: 3.3V
Channel 2: 1.8V
Channel 3: 1.35V
Channel 4: 1.2V (MXL7704-A-EVB) or 0.85V (MXL7704-X-EVB)
LDO: 3.3V
Monitoring or Testing VOUT
■The outputs may be left open or connected to an external load. A low impedance connection will
provide the best load regulation.
Figure 4: VIN Connection
Note A
Note A

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Figure 5: 3.3V Output Transient Response on Channel 1
Typical Output Transient Response
The following waveforms were captured on the MXL7704-A-EVB and MXL7704-X-EVB.
200µs / DIV
VIN = 5V, VOUT = 3.3V at 1A/µs Load Step
f = 1kHz
LOUT = 2.2µH
COUT = 22µF, 6.3V X5R Ceramic
COUT = 2 x 10µF, 6.3V X5R Ceramic
VOUT
80mV / DIV
IOUT
0.5A / DIV
Typical Transient Response

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Figure 7: 1.35V Output Transient Response on Channel 3
Figure 6: 1.8V Output Transient Response on Channel 2
200µs / DIV
VIN = 5V, VOUT = 1.8V at 1A/µs Load Step
f = 1kHz
LOUT = 1µH
COUT = 2 x 22µF, 6.3V X5R Ceramic
COUT = 10µF, 6.3V X5R Ceramic
VOUT
30mV / DIV
IOUT
0.5A / DIV
200µs / DIV
VIN = 5V, VOUT = 1.35V at 1A/µs Load Step
f = 1kHz
LOUT = 0.47µH
COUT = 2 x 22µF, 6.3V X5R Ceramic
VOUT
20mV / DIV
IOUT
0.5A / DIV
Typical Transient Response