DC1900A: 4x 1.2 ~ 3.3V @ 4A, 4 ~ 14V in

Summary

Demonstration circuit 1900A features the LTM®4644EY μModule® regulator, a high-performance high-efficiency quad output step-down regulator. The LTM4644EY has an operating input voltage range of 4V to 14V and is able to provide up to 4A of output current from each of its phases.

Each output’s voltage is programmable from 0.6V to 5.5V.

The LTM4644EY is a DC/DC point of load regulator in a 9mm × 15mm × 5.01mm BGA package requiring only a few input and output capacitors. Output voltage tracking is available through the TRACK/SS pin for supply rail sequencing.

External clock synchronization is also available through the CLKIN pin. The LTM4644 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit 1900A.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	505-DC1900A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	4 Non-Isolated
Voltage Out: Highest Current First	1.2V, 1.5V, 2.5V, 3.3V
Current Out	4A per Channel
Voltage In	4 ~ 14 V
Efficiency @ Conditions	>93%, 5V in, 3.3V @ 0.3 ~ 2.6 A >91%, 5V in, 2.5V @ 0.4 ~ 2.6 A >89%, 5V in, 1.5V @ 0.7 ~ 1.95 A >89%, 12V in, 3.3V @ 1.4 ~ 3.8 A >87%, 5V in, 1.2V @ 0.5 ~ 2 A >87%, 12V in, 2.5V @ 1.2 ~ 3.7 A >83%, 12V in, 1.5V @ 1.05 ~ 3.2 A >81%, 12V in, 1.2V @ 1.1 ~ 2.8 A
Voltage Out Range	0.6 ~ 5.5 V
Features	Current Limit (Adj. or Fixed) Over Current Protection Over Voltage Protection Power Good Output Shutdown, Enable, Standby Synchronizable Thermal Protection Voltage Tracking
Switching Frequency	1 MHz
Standby Current [Typical]	11 µA
Quiescent Current [Typical]	2 mA
Component Count + Extras	82 + 26
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	FPGA / DSP / Processors Point of Load (PoL)
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	6 mA
Main I.C. Base Part	LTM4644EY
Date Created By Author	2013-04
Date Added To Library	2016-01