MPS EVKT-MP8860 User manual

User Guide
MP8860 Evaluation Kit (EVKT-MP8860)

USER GUIDE –MP8860 EVALUATION KIT (EVKT-MP8860)
MP8860 Evaluation Kit User Guide rev 1.0 MonolithicPower.com 1
4/4/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
Table of Contents
Overview...................................................................................................................................................2
Introduction...............................................................................................................................................2
Kit Contents ..............................................................................................................................................2
Features and Benefits...............................................................................................................................3
Kit Specifications ......................................................................................................................................3
Section 1. Hardware Specifications..........................................................................................................4
1.1 Personal Computer Requirements..................................................................................................4
1.2 EV8860-Q-00A Specifications.........................................................................................................4
1.3 EVKT-USBI2C-02 Specifications ....................................................................................................4
Section 2. Software Requirements ...........................................................................................................5
2.1 Software Installation Procedure ......................................................................................................5
Section 3. Evaluation Kit Test Set-Up.......................................................................................................6
3.1 Hardware Set-Up.............................................................................................................................6
3.2 Powering up the EVB......................................................................................................................6
3.3 Software Set-Up..............................................................................................................................6
3.4 Troubleshooting Tips.......................................................................................................................9
Section 4. Ordering Information..............................................................................................................11

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Overview
Introduction
The EVKT-MP8860 is an evaluation kit for the MP8860, a synchronous, 4-switch, integrated, buck-
boost converter capable of regulating the output voltage from a wide 2.8V to 22V input voltage range
with high efficiency. The MP8860 provides flexible system configurations via the I2C. This kit allows for
quick evaluation of the MP8860, supporting a wide range of designs.
Kit Contents
EVKT-MP8860 kit contents: (Items listed below can be ordered separately, GUI installation file and
supplemental documents can be downloaded from the MPS website)
#
Part Number
Item
Quantity
1
EV8860-Q-00A
MP8860GQ-0000 evaluation board
1
2
EVKT-USBI2C-02
Includes one USB to I2C communication interface device, one USB
male A to B cable, one 3-pin ribbon cable
1
Figure 1: EVKT-MP8860 Evaluation Kit Set-Up
Input
Power
Supply
Input
Output
Load
USB
Cable
Ribbon
Cable
Evaluation
Board
GUI
USB to I2C communication
interface EVKT-USBI2C-02

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Features and Benefits
The MP8860 is highly customizable. Users can configure the MP8860 via the MPS I2C GUI.
All changes made in I2C mode will NOT be retained once the EVB is powered down.
Adjustable features are outlined below.
I2C
Output voltage setting
PG delay enable
Output current limit
Part enable
OCP and OVP mode
Discharge enable
Mode
Frequency
Line drop compensation
Soft-start time
Read status and ID
Interrupt
Mask
Kit Specifications
Features
Specification
Operating input voltage
2.8V - 22V
Operating systems supported
Windows 7 or later
System requirements
Minimum 22.2 MB free
GUI software
5 register controls: Interrupt, Vout, current, control, mask
EVB size (L x W)
6.35cm x 6.35cm

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Section 1. Hardware Specifications
1.1 Personal Computer Requirements
The following must be minimally met to use the EVKT-MP8860.
Operating system of Windows 7 or later
Net Framework 4.0
PC with a minimum of one available USB port
At least 22.2 MB of free space
1.2 EV8860-Q-00A Specifications
The EV8860-Q-00A is an evaluation board for the MP8860GQ-0000. For more information, please refer
to the EV8860-Q-00A datasheet.
Figure 2: EV8860-Q-00A Evaluation Board
1.3 EVKT-USBI2C-02 Specifications
The EVKT-USBI2C-02 refers to the USB to I2C communication interface device, which connects the
EVB, the PC, and its supporting accessories. It provides I2C and PMBus capabilities. Together with
MPS Virtual Bench Pro and GUI tools, it provides a quick and easy way to evaluate the performance of
MPS digital products. For more details, refer to the EVKT-USBI2C-02 datasheet.
Figure 3: EVKT-USBI2C-02 Communication Interface Device
Feature
Specification
Operating input voltage
2.8V - 22V
EVB size (L x W)
6.35cm x 6.35cm

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Section 2. Software Requirements
2.1 Software Installation Procedure
Programming occurs through the MPS I2C GUI. Follow the instructions below to install the software.
1. Double click the .exe file to open the set-up guide (see Figure 4).
2. Follow the prompts in the set-up guide.
3. Wait for status screen to verify that installation is complete (see Figure 5).
Figure 4: MPS I2C GUI Set-Up Guide
Figure 5: Driver Set-Up Success

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Section 3. Evaluation Kit Test Set-Up
3.1 Hardware Set-Up
The hardware must be properly configured prior to use. Follow the instructions below to set up the EVB.
1. Locate the proper wires to connect the EVB to the EVKT-USBI2C-02 communication interface
device.
2. Connect SCL, SDA, and GND (see Figure 6). If needed, refer to the datasheet for further
clarification.
3. Use the USB cable to connect the EVKT-USBI2C-02 communication interface device to the PC and
follow the instructions below to set up the EVB.
Figure 6: EVB to MPS I2C Communication Interface Device Wire Connection
3.2 Powering up the EVB
1. Connect the positive and negative terminals of the load to the VOUT and GND pins, respectively.
2. Preset the power supply output between 2.8V and 22V, and then turn off the power supply.
3. Connect the positive and negative terminals of the power supply output to the VIN and GND pins,
respectively.
4. Turn the power supply on. The board will start up automatically with the default settings.
3.3 Software Set-Up
After connecting the hardware according to the steps above, follow the steps below to use the GUI
software.
1. Start the software. It will check the EVB connection automatically.
If the connection is successful, the address will be listed in the “Slave Address” (see Figure 7).

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Figure 7: Appearance of Address Showing Successful Connection
If not, one of two warnings will appear at the bottom:
1) “No Slave Found. Please Check the Connection!” This means that the evaluation board is
not connected (see Figure 8).
2) “Device is not available. Please check the Connection!” This means that the USB I2C
communication interface device is not connected (see Figure 9).
Figure 8: Warning Indicates Unsuccessful Connection –Evaluation Board Not Connected
No Slave Found. Please check the connection!

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Figure 9: Warning Indicates Unsuccessful Connection –USBI2C Communication Interface Device is Not
Connected
2. If the connection is successful, proceed to Step 3. Otherwise, check the connections between the
EVB, communication interface device, and PC. Re-plug the USB into the computer and restart the
GUI.
3. Select MP8860 from under Part Numbers. The Register Control menu will appear on the left side.
The I2C register values will be read automatically and displayed on the right (see Figure 10).
Figure 10: Values from I2C Shown in Table
Device is not available. Please check the connection!

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4. Find the item you want to change and select the desired value from the drop-down menu.
5. Click the “Read All” button to update values. The changed information of the item will appear on the
right side (see Figure 11).
Figure 11: Refer to Datasheet to Translate 0’s and 1’s
All changes made via the I2C will be restored to default values once the EVB is powered down.
3.4 Troubleshooting Tips
EVKT-USBI2C-02 Driver Problem
Note: USBI2C-02 and USBI2C-01 drivers are not compatible. USBI2C-02 uses USBXpress and
USBI2C uses Cyusb3. USBI2C-02 is the recommended device for the MPS PMBus and I2C.
EVKT-USBI2C-01
In case that the USBI2C-01 driver is not properly
installed, manual installation is required. Follow the
steps below.
1. Open the Device Manager and select Update Driver
Software (see Figure 12).
2. Click “Browse my computer for driver software”.
3. Find the driver and install.
Figure 12: Updating the Driver Software

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EVKT-USBI2C-02
In the case that the USBI2C-02 driver is not properly
installed, manual installation is required. Follow the
steps below.
Note: Check the driver version. Find “USBXpress”
Device in the Device Manager under USB
controllers.
Right click and view properties. Check to make sure
the driver version matches the newest version (see
Figure 13).
1. Install the correct USBXpress “.exe” file. Choose
either 32 bit or 64 bit operating system.
32-bit: USBXpressInstaller_x86.exe
64-bit: USBXpressInstaller_x64.exe
2. Connect the EVKT-USBI2C-02 communication
interface device to the PC with the USB cable.
No Supply
The MP8860’s input pin has an under-voltage lockout (UVLO) detection circuit. If the input voltage
(VIN) is lower than the UVLO falling threshold, the MP8860’s functions are disabled.
Shutdown Event
Three events can shut down the chip: EN low, VIN low, and thermal shutdown. During shutdown, the
signaling path is blocked to avoid any fault triggering. Then VCOMP and the internal supply rail are pulled
down. The floating driver is not subject to this shutdown command.
Thermal Recovery
When the silicon die temperature exceeds 150°C, the entire chip shuts down. When the temperature
falls below its lower threshold (typically 130°C), the chip is enabled.
OCP and OVP Mode
When OCP or OVP are triggered, the MP8860 enters hiccup mode or latch-off mode. In hiccup mode,
the MP8860 stops switching and recovers automatically with 12.5% duty cycles. In latch-off mode, the
MP8860 stops switching until the IC restarts (VIN, EN, or EN bit toggle). For MP8860GQ-0000, the
default mode is hiccup mode.
Figure 13: Updating the Driver Software

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Section 4. Ordering Information
The components of the evaluation kit can be purchased separately depending on user needs.
Part Number
Description
EVKT-MP8860
Complete evaluation kit
Contents of EVKT-MP8860
EV8860-Q-00A
MP8860GQ-0000 evaluation board
EVKT-USBI2C-02
Includes one USB to I2C communication interface device, one USB
male A to B cable, one 3-in ribbon cable
Order directly from MonolithicPower.com or our distributors.