DC1778B-A: 1.8V @ 20A, 6.5 ~ 24V in, Buck


Demonstration circuit 1778B-A is a single-output, synchronous buck converter featuring the LTC3883EUH, a single-output current mode controller with digital power management and input current sense capability. It senses output inductor current across a sense resistor.

The board can be populated with the LTC3883EUH-1, which allows the user to provide bias power to the IC from an external power supply to save on-board LDO power loss.

The output voltage of the board can be programmed from 0.5V to 5V, with output current up to 20A. The factory default setting for the output is 1.8V.

The DC1778B-A powers up to default settings and produces power based on configuration resistors, or NVM, without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter aspects of the LTC3883. To fully explore the extensive digital power management features of the part, download the LTpowerPlay® GUI software 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.


Manufacturer Linear Technology/Analog Devices
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number DC1778B-A-ND
Eval Board Supplier Linear Technology/Analog Devices
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1.8 V
Current Out 20 A
Voltage In 6.5 ~ 24 V
Efficiency @ Conditions >90%, 12V in, 1.8V @ 9 ~ 20 A
>89%, 12V in, 1.5V @ 8 ~ 20 A
>88%, 12V in, 1.2V @ 8 ~20 A
>86%, 12V in, 1.0V @ 9 ~ 20 A
Voltage Out Range 0.5 ~ 5 V
Features Current Limit (Adj. or Fixed)
I²C Interface
Memory Available On-Board
PMBus Interface
Power Good Output
Shutdown, Enable, Standby
Soft Start
Temperature Compensation
Under Voltage Protection, Brown-Out
Switching Frequency 425 kHz
Standby Current [Typical] - Not Given
Quiescent Current [Typical] 20 mA
Component Count + Extras 92 + 42
Internal Switch No
Design Author Linear Technology
Application / Target Market Auxiliary Power Supply
Standby Current [Maximum] - Not Given
Quiescent Current [Maximum] 30 mA
Main I.C. Base Part LTC3883
Date Created By Author 2012-05
Date Added To Library 2016-12

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