DC2164A-A: 1V @ 70A, 4.5 ~ 15V in, Buck

Summary

Demonstration Circuit 2164A-A features a PolyPhase® design using the LTM®4630EY-1 (A-grade), the high efficiency, high density, dual 18A, switch mode step-down power module regulator. The input voltage is from 4.5V to 15V. The output voltage is jumper selectable from 0.9V to 1.8V. DC2164A-A can deliver nominal 70A output current. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions.

The LTM4630-1A on DC2164A-A always operate in continuous conduction mode. The switching frequency can be programmed through a resistor or can be synchronized to an external clock signal. The board allows the user to program how its output voltage ramps up and down through the TRACK pin. The output voltage is tightly regulated between VO + and VO – through remote output voltage sensing which improves output voltage regulation at heavy loads.

The LTM4630-1A has ±0.8% total DC errors.

These features and the availability of the LTM4630EY-1 in a compact 16mm × 16mm × 5.01mm BGA package make it ideal for use in many high-density point-of-load regulation applications. The LTM4630-1 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2164A-A.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC2164A-A-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
Current Out	70 A
Voltage In	4.5 ~ 15 V
Efficiency @ Conditions	>88%, 12V in, 1.8V @ 22 ~ 70 A >87%, 12V in, 1.5V @ 21 ~ 70 A >85%, 12V in, 1.2V @ 19 ~ 70 A >84%, 12V in, 1.0V @ 17 ~70 A >83%, 12V in, 0.9V @ 15 ~ 70 A
Voltage Out Range	0.9 ~ 1.8 V
Features	Current Limit (Adj. or Fixed) Current Sharing Power Good Output Shutdown, Enable, Standby Soft Start Synchronizable Under Voltage Protection, Brown-Out
Switching Frequency	400 ~ 780 kHz
Standby Current [Typical]	50 µA
Quiescent Current [Typical]	65 mA
Component Count + Extras	66 + 47
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	FPGA / DSP / Processors
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	- Not Given
Main I.C. Base Part	LTM4630 -1
Date Created By Author	2015-09
Date Added To Library	2016-04