ANALOG DEVICES EVAL-LTC4286 Power Management Development Boards and Kits User Guide

ANALOG DEVICES EVAL-LTC4286 Power Management Development Boards and Kits

FEATURES

• Fully functional evaluation kit board for the LTC4286
• Populated with 54 V, 36 A, 1 mF design
• 40 V undervoltage and 60 V overvoltage settings
• Flexible N channel MOSFET footprint suits different packages
• Supports up to 12 parallel sense resistors and six parallel MOS-FETs
• LED indicated status outputs
• Wide input voltage range: 8.5 V to 80 V
• 100 V absolute maximum
• MOSFET temperature measurement capability
• I2C/PMBus communication

EVALUATION KIT CONTENTS

• EVAL-LTC4286-A1Z evaluation board

DOCUMENTS NEEDED

• LTC4286 datasheet

ADDITIONAL HARDWARE NEEDED

• USB-to-PMBus controller for use with LTpowerPlay, DC1613A (not included, must be ordered separately)

GENERAL DESCRIPTION

The EVAL-LTC4286-A1Z is a fully featured evaluation board for the LTC4286. The board layout provides a clear example of all the peripheral components and the hot-swap power path. The layout also maximizes the ability of the board to dissipate heat for some of the key components on the power path, allowing the evaluation of high-current hot-swap setups.

• Twelve sense resistor footprints and six (three on the bottom side) multipackage metal-oxide-semiconductor field-effect transistor (MOSFET) footprints provide great flexibility and allow a wide range of application setups.
• Multiple test points allow easy access to all critical points and pins. Seven light-emitting diodes (LEDs) provide direct visual indication of board status, such as supply input, output, SDA, SCL, ALERT, power good, and fault.
• The board supports PMBus communication, allowing the user to communicate with the LTC4286.
• The board is fully compatible with the LTpowerPlay® evaluation software, which can be downloaded from the LTpowerPlay page.
• A USB-to-I2C controller (DC1613A) is required to use the evaluation software.
• The standard evaluation kit is prepopulated and tested with a 54 V, 36 A hot-swap design capable of working with a 1 mF output capacitor.
• The full specifications of the LTC4286 are available in the LTC4286 data sheet available from Analog Devices, Inc., and must be consulted with this user guide when using the EVAL-LTC4286-A1Z evaluation board.

EVAL-LTC4286-A1Z EVALUATION BOARD LAYOUT

QUICK START GUIDE

The EVAL-LTC4286-A1Z evaluation board is easy to setup to evaluate the performance of the LTC4286. See Figure 2 for the proper measurement equipment setup and refer to the following procedures.

WARNING AND MEASUREMENT TECHNIQUES

• The EVAL-LTC4286-A1Z is capable of operation in excess of 40 A. At this current and power level, there is a danger of serious personal injury and equipment damage if proper techniques are not used. All cabling between the power supply and the load must be capable of handling the current levels used, including the GND connection to the EVAL-LTC4286-A1Z.
• Additionally, the high currents and fast transients can cause unexpected voltage drops in cables connecting the test equipment to the EVAL-LTC4286-A1Z due to parasitic resistance and inductance. The cable drops may cause ground loops for the current through various cables and scope probes. This causes unexplained ringing, distorted oscilloscope waveforms, voltage and current spikes, and signals appearing to be below ground.
• A common sneak path for current is the third wire ground used on power cords of test equipment in use. Using ground lifting connectors at the wall outlet do not necessarily alleviate these effects since most equipment has line bypassing capacitors between the mains voltage and local chassis ground. Isolating test equipment using line isolation transformers with low primary to secondary capacitance is recommended. Probe ground leads may intercept induced fields from the high current paths and should be minimized or avoided.
• Another method to remove these artifacts is the use of a differential scope probe connected between the signal to be observed and a ground connection located close to the point of measurement.
• A very large, low-effective series resistance (ESR) capacitor from INPUT to GND can reduce supply droop and ground bounce during testing.
• Also be careful not to allow an open ground from the power supply or load to cause a return current through the grounds of the various devices connected to the demo board. This can present a fire hazard or cause damage to the test equipment.

The EVAL-LTC4286-A1Z is set up to operate in a 54 V system at current levels up to 36 A. The board is designed to work at 36 A in a normal laboratory environment with natural convection. Suppose the current limit is increased or the board is operated in a high-temperature environment. In that case, additional airflow is needed to keep it within safe thermal operating limits for continuous operation. If additional current is required without sufficient airflow, multiple MOS-FETs must be connected in parallel with the existing MOSFETs to lower their I2R losses.

EVAL-LTC4286-A1Z SETUP
To set up and start using the evaluation board, take the following steps:

1. On a Windows PC, download and install the LTpowerPlay application from https://www.analog.com/en/design-center/ltpow-er-play.html.
2. Connect the evaluation board (EVAL-LTC4286-A1Z) to the PC through the 12-way connector, J2, and the USB-to-I2C controller (DC1613A).
3. Connect a power supply to the evaluation board using thick wires (10 AWG or 62 mm) suitable for the current levels to be observed.
4. To confirm that the boards are configured correctly, set the output of the power supply to 54 V with less than 1 A current limit and with no load capacitance. If the boards are configured correctly, the green LED (labeled PG#) on the evaluation board illuminates.
5. Move the EN jumper, JP5, to the lower position. The green LED (labelled PG#) turns off and then turns back on again when JP5 is moved back to the upper position.
6. If a fault event occurs (for example, a short circuit during opera-tion), the red LED (labeled FLT#) illuminates. This fault can be cleared by toggling the ENABLE pin after the fault condition has been removed.
7. Disable the hot-swap using the Hot-Swap Control section in the Basic Operation tab of the software graphical user interface (GUI). Disabling the hot swap turns off the green LED (labeled PG#) on the evaluation board.

CONTROL WITH LTpowerPlay
LTpowerPlay is a convenient PC GUI that gives complete access to the registers of the LTC4286 and many other Analog Devices’ power system management devices. It can be used to configure and debug the application. LTpowerPlay communicates using the I2C bus in the demo system (covered in this user guide) or in a real-world product environment. It provides unprecedented control over the Analog Devices chips on the I2C bus. Use it during board bring up to tune and optimize the power system parameters and during system debugging to view critical system information and troubleshoot board design or manufacturing issues. LTpowerPlay includes extensive help and documentation under the Help menu. Online help includes quick-start videos and tutorials, and detailed technical documentation from the Analog Device website.
Launch the LTpowerPlay GUI on the PC. The software identifies the DC1613A controller. Click the Detect Chips button.

LTpowerPlay searches the PMBus for all supported devices. After establishing communication with the LTC4286, the GUI displays the main window shown in Figure 4.

SETUP
The value of the current-sense resistor must be set RS (SENSE) in LTpowerPlay. Click the Setup button. Locate the setting for RS (SENSE). Enter the value of the current-sense resistor. For the EVAL-LTC4286-A1Z, enter 0.500 as shown in Figure 5. It is necessary to set the value of RS each time LTpowerPlay is launched. The value of RS is used in the calculation of current and power.

To update the register’s contents, click or type to change the required registers, then in the top toolbar, click the PC to RAM button. LTpowerPlay writes changes to the updated registers.

Note that to program the registers in the LTC4286, turn off the pass MOSFET.
Most of the registers have immediate control over their respective chip functions. Changing them while the MOSFET is on has unpredictable and adverse effects. LTpowerPlay implements limits to writing some registers, based upon the device state, and pops up warnings when necessary. In the LTpowerPlay main window (see Figure 4), there is the Telemetry pane window (see Figure 7) that displays read-only information contained in the status registers of the selected part. The GUI periodically polls the I2C bus and updates the telemetry contents in real-time, along with a user-friendly interpretation of the bits.

MOSFETS
The EVAL-LTC4286-A1Z uses a custom MOSFET footprint as shown in Figure 8 to accommodate a variety of common MOSFET packages, including D2PAK, DPAK, LFPAK, and other 8-lead SOIC variants.

SENSE RESISTORS
For optimum current sensing accuracy with standard 2512 sense resistors, the footprint shown in Figure 9 is preferred. This footprint may not be optimized to all resistors, and results may vary depending on resistor composition and size. The centre pads are used as the Kelvin connection to sense the voltage at the resistor. Some resistors provide more accurate results if sensed at the inner edge of the resistor (labelled A as shown in Figure 9). Consult and follow the guidance provided by the resistor manufac-turer. The board can be configured with up to 12 current-sense resistors. The Kelvin connections are combined using a resistive network made with 0402 resistors.

If replacing the current-sense resistors, it is the responsibility of the user to ensure that the layout dimensions and structure of the footprint comply with individual SMT manufacturing requirements. Failure to do this may result inaccurate telemetry.

BOARD SPECIFICATIONS
Table 1. Board Specifications

Parameter Typical Value

EVALUATION BOARD HARDWARE

CONNECTOR AND LED FUNCTIONS
Table 2. Power Input and Signal Connections

Nomenclature                                         Connector Description

DC590B or DC2026C (Optional)| J1| I2C

Table 3. Default Jumper Configuration

Jumper Name Description                                 Default

JP3, JP4

JP5

| ADR0 and ADR1

EN

| 3 to 4 (Address 7h40)

1 to 2 (enabled)

---|---|---

Table 4. Test Points, Turrets

Nomenclature Description

INTVCC

UV

| Internal INTVCC pin

UV input pin

OV| OV input pin
TIMER| Current-limit TMR pin
GATE1| GATE1 pin
SCL| I2C clock
SDA| I2C data
GPIO1| Power good, PG#1
GPIO2| Fault, FLT#1
GPIO3| Temp sensor (Q18)1
GPIO4| IOUT_OC_STATUS1
GPIO5| Reserved
GPIO6| Reserved
GPIO7| Reserved
GPIO8| OP1_STATUS, overpower1

1. With the default EVAL-LTC4286-A1Z settings.

Table 5. Other Test Points

Nomenclature Description

INTVCC DVCC

SENSE+1

| LTC4286

LTC4286 internal logic supply Positive current-limit input

---|---
SENSE−1| Negative current-limit input
ADC+| Positive sense input to the ADC
ADC−| Negative sense input to the ADC

Table 6. LED Indicators

Nomenclature Designation Description

1. With the default EVAL-LTC4286-A1Z settings.
2. The ALERT LED is driven by the IOUT_OC_STATUS OUTPUT in the default configuration, which can be changed by writing to the registers.

EVALUATION BOARD SCHEMATICS AND ARTWORK

ORDERING INFORMATION

BILL OF MATERIALS
Table 7. Bill of Materials

Reference Designator Description Manufacturer                  Part Number 1

06033C104MAT2A
C18| Capacitor, 100 μF, aluminum electrolytic, 100 V| Nichicon| URZ2A101MHD1TO
C22| Capacitor, 0.022 µF, X7R, 50 V, 5%, 0603| AVX| 06035C223JAT2A
C23| Capacitor, 68 nF, X7R, 100 V, 10%, 0805| Kemet| C0805C683K1RECAUTO
C25| Capacitor, 0.1 µF, X5R, 100 V, 20%, 1206| Taiyo Yuden| HMK316BJ104ML-T
C34| Capacitor, option, 1206| Not applicable| Not applicable
C35, C39| Capacitors, option, 0603| Not applicable| Not applicable
C37, C38| Capacitors, option, 0805| Not applicable| Not applicable
D3, D6, D7, D16, D17| LEDs, green, water-clear, 0805| Wurth Elektronik| 150080GS75000
D9, D18| LEDs, red, water-clear, 0805| Wurth Elektronik| 150080RS75000
D10, D11, D15| Diodes, TVS, ESD suppressor, 64 V, 1500 W,| Littelfuse| SMCJ64A
| DO-214AB| |
D20| Diode, switching, 200 V, 200 mA, SOD-123| Micro Commercial Co.| BAV21W-TP
D21| Diode, Schottky, 100 V, 5 A, POWERDI5, AEC-| Diodes Inc.| PDS5100H-13
| Q101| |
E1, E2, E3| Connectors, TERM., shank, red cube, M6, 25| Wurth Elektronik| 7461098
| pin, press-fit, THT, brass, TIN| |
E4, E5, E8, E11, E13, E14, E15, E18, E19, E20,| Test points, turret, 0.064″ MTG. hole, PCB| Mill-max| 2308-4-00-80-00-00-07-0
E22, E24, E25, E26, E27, E28, E29, E33, E34,| 0.125″ THK| |
E35, E36, E39, E40| | |
E30, E31, E32| Connectors, banana jack, female, through-hole,| Keystone| 575-4
| noninsulated, swage, 0.218″| |
E38| Lug, ring, 1/4″ stud, crimp, 4 AWG, 1.30″L,| Panduit| S4-14R-E
| noninsulated| |
J1| Connector, header, shrouded, plug, male, 2 × 7,| Molex| 87831-1420
| 2 mm, vertical, straight, through-hole, KEYED| |
J2| Connector, header, shrouded, male, 2 × 6, 2| Amphenol| 98414-G06-12ULF
| mm, vertical, straight, through-hole| |
JP3, JP4| Connectors, header, male,1 4, 2 mm, vertical,| Samtec| TMM-104-02-L-S
| straight, through-hole| |
JP5| Connector, header, male, 1 × 3, 2 mm, vertical,| Samtec| TMM-103-02-L-S
| straight, through-hole, 10 µ” Au| |
LB1| Label specification, demo board serial number| Brady| THT-96-717-10
MP1, MP2, MP3, MP4| Standoff, nylon, snap-ons, 0.25″ (6.4 mm)| Keystone| 8831
PCB1| PCB, EVAL-LTC4286-A1Z| Analog Devices| 600-EVAL-LTC4286-A1Z
| | approved supplier|
Q1, Q2, Q3| Transistors, MOSFET, N channel, 60 V, 300| Vishay| 2N7002K-T1-GE3
| mA, SOT-23-3 (TO-236)| |
Q18| Transistor, NPN, 40 V, 200 mA, SOT23-3, AEC-| Diodes Inc.| MMBT3904-7-F
| Q101| |
Q25| Transistors, MOSFET, N channel, 40 V, 425 A,| Nexperia| PSMN2R3-100SSE
| LFPAK88| |
R4, R17, R193, R194| Resistors, 40.2 kΩ, 1%, 1/4 W, 1206| Stackpole Electronics,| RMCF1206FT40K2
| | Inc.|
R10, R11, R21| Resistors, 3.01 kΩ, 1%, 1/10 W, 0603| Vishay| CRCW06033K01FKEA
R12, R13, R14, R22| Resistors, 5.11 kΩ, 1%, 1/10 W, 0603| Panasonic| ERJ3EKF5111V
R15, R16, R152, R158, R185, R254, R255| Resistors, 0 Ω, 1/10 W, 0603, AEC-Q200| Vishay| CRCW06030000Z0EA
R33, R34, R36, R37, R38, R39, R42, R43, R60,| Resistors, option, 0402| Not applicable| Not applicable
R61, R63, R64, R170, R171, R172, R173, R206,| | |
R207, R209, R210, R211, R212, R215, R216,| | |
---|---|---|---
R217, R218, R220, R221, R222, R223, R225,| | |
R226, R227, R228, R230, R231, R232, R233,| | |
R236, R237| | |
R50, R53, R55, R58| Resistors, 1 Ω, 1%, 1/16 W, 0402, AEC-Q200| Vishay| CRCW04021R00FKED
R51, R54, R56, R59| Resistors, 10 Ω, 1%, 1/16 W, 0402| Yageo| RC0402FR-0710RL
R73, R241, R259| Resistors, 10 Ω, 5%, 1/10 W, 0603, AEC-Q200| Panasonic| ERJ3GEYJ100V
R154, R155, R251, R252, R257, R258, R260,| Resistors, option, 0603| Not applicable| Not applicable
R261, R264, R265, R266| | |
R179, R180| Resistors, 0.001 Ω, 1%, 2 W, 2512, AEC-Q200| Yageo| PA2512FKF7W0R001E
| current sense| |
R183| Resistor, 130 kΩ, 1%, 1/4 W, 1206, AEC-Q200| Panasonic Electronic| ERJ- 8ENF1303V
| | Components|
R184| Resistor, 12.1 kΩ, 1%, 1/10 W, 0603, AEC-| Panasonic| ERJ3EKF1212V
| Q200| |
R186| Resistor, 2.67 kΩ, 1%, 1/10 W, 0603, AEC-| Panasonic| ERJ3EKF1212V
| Q200| |
R187| Resistor, 4.02 kΩ, 1%, 1/10 W, 0603, AEC-| Panasonic| ERJ3EKF4021V
| Q200| |
R188| Resistor, 93.1 kΩ, 1%, 1/4 W, 1206, AEC-Q200| NIC| NRC12F9312TRF
R191| Resistor, 121 kΩ, 1%, 1/4 W, 1206| Yageo| RC1206FR-07121KL
R192| Resistor, 402 kΩ, 1/4 W, 1206, AEC-Q200| Vishay| CRCW1206402KFKEA
R195| Resistor, 221 Ω, 1%, 1/4 W, 1206, AEC-Q200| Vishay| CRCW1206221RFKEA
R208, R214, R219, R224, R229, R235| Resistors, option, 2512| Not applicable| Not applicable
R253| Resistor, 14.7 kΩ, 1%, 1/10 W, 0603, AEC-| Panasonic| ERJ3EKF1472V
| Q200| |
R256| Resistor, 88.7 kΩ, 1%, 1/10 W, 0603| Yageo| RC0603FR-0788K7L
R262, R263| Resistor, option, 1206| Not applicable| Not applicable
U1| IC, power controller, QFN-40| Analog Devices| LTC4286AUK#PBF
U2| IC, memory, EEPROM, 2 Kb (256 × 8),| Microchip| 24LC025-I/ST
| TSSOP-8, 400 kHz| |
Z1, Z2| Diodes, Zener, 5.1 V, 500 mW, SOD-123, AEC-| On Semiconductor| MMSZ5231BT1G
| Q101| |

NOTES
I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high-energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions

By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants.

The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. The customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time.

LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND CONCERNING IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00).

EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed by the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

©2023 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887-2356, U.S.A.

References

• Linduino DC2026C Evaluation Board | Analog Devices
• DC590B Evaluation Board | Analog Devices

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