DC1872A: 1V, 1.2V, 1.5V, or 1.8V @ 20A, 4.5 ~ 20V in

Summary

Demonstration circuit DC1872A features the LTM®4637EV, a high efficiency, high density switch mode step-down power μModule® regulator. The input voltage range is from 4.5V to 20V. The output voltage is jumper programmable from 1.0V to 1.8V with a rated load current of 20A. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions.

The DC1872A offers the TRACK/SS pin, allowing the user to program output tracking or soft-start period. The DC1872A allows the user to choose pulse-skipping mode or Burst Mode® operation for higher efficiency at light load conditions.

The LTM4637 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC1872A.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC1872A-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 1.2 V 1.5 V 1.8 V
Current Out	20 A
Voltage In	4.5 ~ 20 V
Efficiency @ Conditions	>88%, 8V in, 1.8V @ 4 ~ 20 A >88%, 5V in, 1.8V @ 2 ~ 20 A >86%, 12V in, 1.8V @ 5.5 ~ 20 A >84%, 16V in, 1.8V @ 7 ~ 20 A >82%, 5V in, 1.0V @ 2 ~ 20 A >82%, 20V in, 1.8V @ 10 ~ 20 A >81%, 8V in, 1.0V @ 3 ~ 20 A >79%, 12V in, 1.0V @ 4.5 ~ 20 A >76%, 16V in, 1.0V @ 6 ~ 20 A >73%, 20V in, 1.0V @ 8 ~ 20 A
Voltage Out Range	0.6 ~ 5.5 V
Features	Current Foldback Protection Current Limit (Adj. or Fixed) Current Sharing Over Voltage Protection Shutdown, Enable, Standby Soft Start Thermal Protection Voltage Tracking
Switching Frequency	520 kHz
Standby Current [Typical]	40 µA
Quiescent Current [Typical]	54 mA
Component Count + Extras	14 + 61
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Medical Power: Industrial Power Servers Telecom
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	- Not Given
Main I.C. Base Part	LTM4637
Date Created By Author	2012-11
Date Added To Library	2013-12