DC2121A: 1V @ 5A, 3.3V @ 5A, 12V @ 4A, 4.75 ~ 28 Vin, Buck

Summary

Demonstration circuit 2121A features the LTM®4634, a high efficiency, triple 5A/5A/4A step-down power µModuleregulator. The input voltage range is from 4.75V to 28V. The output voltage range is 0.8V to 5.5V for Channel 1 and Channel 2, 0.8V to 13.5V for Channel 3. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions.

The DC2121A offers access to the TK/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 10A output solution with optional jumper resistors.

The LTM4634 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2121A.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	DC2121A-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, 3.3V, 12V
Current Out	5A, 5A, 4A
Voltage In	4.75 ~ 28 V
Efficiency @ Conditions	>90%, 28V in, 12V @ 2.3 ~ 4 A >90%, 24V in, 12V @ 1.5 ~ 4 A >90%, 18V in, 12V @ 0.7 ~ 4 A >84%, 5V in, 1V @ 0.7 ~ 5 A >82%, 8V in, 1V @ 2 ~ 5 A >73%, 12V in, 1V @ 1.5 ~ 5 A >70%, 18V in, 1V @ 2.2 ~ 5 A >65%, 24V in, 1V @ 2.5 ~ 5 A
Voltage Out Range	0.8 ~ 5.5 V, 0.8 ~ 5.5 V, 0.8 ~ 13.5 V
Features	Current Limit (Adj. or Fixed) Over Current Protection Over Voltage Protection Power Good Output Shutdown, Enable, Standby Soft Start Synchronizable Voltage Tracking
Switching Frequency	500 kHz
Standby Current [Typical]	10 µA
Quiescent Current [Typical]	45 mA
Component Count + Extras	28 + 61
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Networking Point of Load (PoL) Power: Industrial Power Telecom
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]
Main I.C. Base Part	LTM4634
Date Created By Author	2014-08
Date Added To Library	2017-01