DC2105A-B: 1.8, 3.3, 5V @ 500mA, 4 ~ 65V in


Demonstration circuit 2105A is a 500mA output DC/DC power supply. There are two versions: DC2105A-A is a board featuring LTC®3630A, with 4V to 76V input range; DC2105A-B is a board featuring LTC3630, with 4V to 65V input range. The LTC3630A/LTC3630 operates in a high efficiency Burst Mode® operation and includes internal high and low side switches. The board provides jumper selected output voltages of 1.8V, 3.3V, 5V and an option for additional voltages. LTC3630A/LTC3630 has internal soft-start and a provision for increasing soft-start time.

Included on the board is an ON/OFF jumper that can also be configured as a precision undervoltage lockout. Additional PC pads are included for programming current limit to optimize efficiency and for reducing output voltage ripple and reducing component size. A terminal (FBO) is available to allow multiple boards to be paralleled for increasing output current.

Output voltage between 800mV and VIN can be programmed using optional resistors, although higher voltage output capacitors will be required.

The LTC3630A/LTC3630 data sheet gives a complete description of the operation and application information. The data sheet must be read in conjunction with this demo manual.


Manufacturer Analog Devices Inc.
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number DC2105A-B-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 1.8 V
3.3 V
5 V
Current Out 500 mA
Voltage In 4 ~ 65 V
Efficiency @ Conditions >88%, 12V in, 5V @ 0.8 ~ 300 mA
>82%, 36V in, 5V @ 4 ~ 500 mA
>80%, 12V in, 1.8V @ 1.5 ~ 300 mA
>75%, 65V in, 5V @ 02 ~ 500 mA
>75%, 36V in, 1.8V @ 8 ~ 500 mA
>72%, 65V in, 1.8V @ 70 ~ 500 mA
Voltage Out Range 0.8 ~ Vin
Features Current Limit (Adj. or Fixed)
Shutdown, Enable, Standby
Soft Start
Under Voltage Protection, Brown-Out
Switching Frequency - Not Given
Standby Current [Typical] 5 µA
Quiescent Current [Typical] 12 µA
Component Count + Extras 12 + 12
Internal Switch Yes
Design Author Linear Technology
Application / Target Market Automotive
Portable Devices
Power: Industrial Power
Standby Current [Maximum] 10 µA
Quiescent Current [Maximum] 20 µA
Main I.C. Base Part LTC3630
Date Created By Author 2013-04
Date Added To Library 2015-07

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