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DESCRIPTION
Demonstration circuit 2824A-A is a single output buck
converter with 4.5V to 20V input voltage range featuring
the
LTC
7131-1, a 25A monolithic synchronous step-
®
down converter with a PMBus interface. The output volt-
age is adjustable from 0.4V to 4V and the converter can
supply up to 25A of load current.
The DC2824A-A powers up to default settings and pro-
duces power based on configuration resistors without the
need for any serial bus communication, which allows easy
evaluation of the DC/DC converter.
To fully explore the extensive power system manage-
ment features of the part, download the GUI software
LTpowerPlay
onto your PC and use ADI's USB-to-PMBus
®
dongle
DC1613A
to connect to the board.
BOARD PHOTO
25A Monolithic Synchronous DC/DC Step-
Down Converter with PMBus Interface
DEMO MANUAL
LTpowerPlay allows users to monitor fault status and
real-time telemetry of input and output voltages, input
and output current, and internal IC die temperature.
Programmable parameters include device address, out-
put voltage, on/off control, and fault response to output
overvoltage and output overcurrent.
The LTC7131-1 data sheet gives a complete description
of this part, its operation and application information and
must be read in conjunction with this quick start guide
for DC2824A-A.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
DC2824A-A
LTC7131-1
available.
Rev. 0
1
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Table of Contents
Related Manuals for Linear ADI Power LTC7131-1
Summary of Contents for Linear ADI Power LTC7131-1
- Page 1 DEMO MANUAL DC2824A-A LTC7131-1 25A Monolithic Synchronous DC/DC Step- Down Converter with PMBus Interface DESCRIPTION Demonstration circuit 2824A-A is a single output buck LTpowerPlay allows users to monitor fault status and converter with 4.5V to 20V input voltage range featuring real-time telemetry of input and output voltages, input 7131-1, a 25A monolithic synchronous step- and output current, and internal IC die temperature.
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Page 2: Performance Summary
DEMO MANUAL DC2824A-A PERFORMANCE SUMMARY Specifications are at T = 25°C PARAMETER CONDITIONS UNITS Input Voltage Range Output Voltage, V = 4.5V to 20V, I = 0A to 25A Maximum Output Current, I = 4.5V to 20V, V = 0.4V to 4V Typical Efficiency =12V, V = 1V, I... -
Page 3: Test Setup Diagram
DEMO MANUAL DC2824A-A TEST SETUP DIAGRAM Figure 2. Proper Measurement Equipment Setup Rev. 0... -
Page 4: Test Results
DEMO MANUAL DC2824A-A TEST RESULTS 0.65V 1.2V 0.8V 1.8V 3.3V OUTPUT LOAD CURRENT (A) dc2824a-a F01 Figure 3. Efficiency vs load Current with V = 12V, f = 480kHz 5mV/DIV 5mV/DIV dc2824a-a G04b 2µs/DIV dc2824a-a G04a 2µs/DIV = 12V, I = 25A, f = 480kHz = 12V, I = 25A, f... -
Page 5: Thermal Image
DEMO MANUAL DC2824A-A THERMAL IMAGE DC2824A-A operating at 12V configured for a 1V 25A An example thermal image shows the temperature distri- (25W) output load. No heat sink or forced airflow is used bution on DC2824A-A. The test is done in still air at room for the measurements. - Page 6 DEMO MANUAL DC2824A-A LTpowerPlay FOR LTC7131-1 QUICK START PROCEDURE The following procedure describes how to use LTpowerPlay b. After LTC7131-1 is detected, the LTpowerPlay to monitor and change the settings of LTC7131-1. main interface appears as shown in Figure 7, and a message box like below also shows for a Download and install the LTPowerPlay GUI.
- Page 7 DEMO MANUAL DC2824A-A LTpowerPlay FOR LTC7131-1 QUICK START PROCEDURE c. The LTC7131-1 supports telemetry read-back e. Here is an example of margining the output volt- within the LTpowerPlay which allows read-back age high. First, enter the desired margin-high of input/output voltages and currents as well as percentage (25%) in the MFR_VOUT_MARGIN_ the device temperature, as shown below.
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Page 8: Parts List
DEMO MANUAL DC2824A-A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit CAP ., 47pF, C0G, 50V, 5%, 0603 VISHAY, VJ0603A470JXAAC CAP ., 4700pF, X7R, 50V, 10%, 0603 AVX, 06035C472KAT2A CAP ., 0.01µF, X7R, 25V, 10%, 0603 AVX, 06033C103KAT2A CAP ., 47pF, X7R, 50V, 10%, 0603 AVX, 06035C470KAT2A C5, C9... - Page 9 DEMO MANUAL DC2824A-A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER IC, 25A MONOLITHIC SYNCHRONOUS DC/DC STEP-DOWN ANALOG DEVICES, LTC7131IY-1#PBF CONVERTER WITH PMBus INTERFACE, BGA IC, MEMORY, EEPROM, 2Kb (256×8), TSSOP-8, 400kHz MICROCHIP , 24LC025-I/ST Additional Demo Board Circuit Components C6, C43 CAP ., OPTION, 0603 C8, COUT2,...
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Page 10: Schematic Diagram
DEMO MANUAL DC2824A-A SCHEMATIC DIAGRAM Rev. 0... - Page 11 DEMO MANUAL DC2824A-A SCHEMATIC DIAGRAM Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice.
- Page 12 DEMO MANUAL DC2824A-A 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.