DC1989B-C: 1V @ 100A, 4.5 ~ 17 Vin, Buck


Demonstration circuit 1989B-C is a high efficiency, high density, µModule regulator with 4.5V to 17V input range. The output voltage is adjustable from 0.5V to 4V, and it can supply 100A maximum load current. The demo board has four LTM®4676A µModule regulators. The LTM4676A is a dual 13A or single 26A step-down regulator with PMBus power system management. Please see LTM4676A data sheet for more detailed information.

DC1989B-C powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay™ onto your PC and use LTC's I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.

The software can be downloaded from:


For more details and instructions of LTpowerPlay, please refer to "LT power Play GUI for LTM4676A Quick Start Guide".

Design files for this circuit board are available at http://www.linear.com/demo/DC1989B-C


Manufacturer Analog Devices Inc.
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number DC1989B-C-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1 V
Current Out 100 A
Voltage In 4.5 ~ 17 V
Efficiency @ Conditions >82%, 12V in, 1V @ 12 ~ 100 A
>80%, 5V in, 1V @ 10 ~ 100 A
Voltage Out Range 0.5 ~ 4 V
Features Current Limit (Adj. or Fixed)
I²C Interface
Light Load Mode
Over Voltage Protection
PMBus Interface
Shutdown, Enable, Standby
SMBus Interface
Under Voltage Protection, Brown-Out
Switching Frequency 350 kHz
Standby Current [Typical] 50 µA
Quiescent Current [Typical] 40 mA
Component Count + Extras 143 + 137
Internal Switch No
Design Author Linear Technology
Application / Target Market Power: Auxiliary Power Supply
Power: Industrial Power
Standby Current [Maximum] - Not Given
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part LTM4676A
Date Created By Author 2016-03
Date Added To Library 2018-03

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