DC1905A: 1, 1.2, 3.3V @ 10A, 4.7 ~ 16V in, Buck


Demonstration circuit DC1905A features the LTM®4633EY, a high efficiency, triple 10A step-down power μModule® regulator. The input voltage range is from 4.7V to 16V with common input source, or 2.375V to 16V with an external bias supply. The output voltage range is 0.8V to 1.8V for Channel 1 and Channel 2, 0.8V to 5.5V for Channel 3. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions.

The DC1905A offers access to the TRACK/SS pins allowing the user to program output tracking or soft-start period. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP4) selects pulse-skipping mode for noise sensitive applications or Burst-Mode® operation in less noise sensitive applications. Channel 1 and 2 can be connected in parallel for a single 20A output solution with optional jumper resistors.

The LTM4633 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC1905A.


Manufacturer Analog Devices Inc.
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Part Number DC1905A-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 3 Non-Isolated
Voltage Out: Highest Current First 1V, 1.2V, 3.3V
Current Out 10A per Channel
Voltage In 4.7 ~ 16 V
Efficiency @ Conditions >93%, 5V in, 3.3V @ 1.2 ~ 10 A
>88%, 16V in, 3.3 V ~ 4 ~ 10 A
>84%, 5V in, 1.2V @ 1.6 ~ 10 A
>80%, 5V in, 1.0V @ 1.2 ~ 10 A
>75%, 16V in, 1.2V @ 3.6 ~ 10 A
>70%, 16V in, 1.0V @ 2.8 ~ 10 A
Voltage Out Range (Ch 1 & 2) 0.8 ~1.8 V, (Ch 3) 0.8 ~ 5.5 V
Features Current Limit (Adj. or Fixed)
Current Sharing
Over Current Protection
Over Voltage Protection
Power Good Output
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Voltage Tracking
Switching Frequency 750 kHz
Standby Current [Typical] 50 µA
Quiescent Current [Typical] 45 mA
Component Count + Extras 30 + 37
Internal Switch Yes
Design Author Linear Technology
Application / Target Market Networking
Point of Load (PoL)
Power: Industrial Power
Standby Current [Maximum] - Not Given
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part LTM4633
Date Created By Author 2013-06
Date Added To Library 2015-07

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