DC2225A: 1V @ 160A, 4.5 ~ 14V in, Buck

Summary

Demonstration circuit 2225A is a high efficiency, high density, 4-phase synchronous buck converter with a 4.5V to 14V input voltage range. It can supply up to 160A of load current with a 1.0V output. This demo board has two each LTC®3875EUJ feature-rich dual phase current mode synchronous buck controllers with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing.

This board is set up with 0.32mΩ DCR output inductors. The temperature compensation function offers an option for accurate current limit over a wide temperature range with DCR sensing. To shut down the converter, set the RUN pin voltage below 1V (SW1: OFF).Use JP1 jumper to select Burst Mode® operation, pulse skipping mode or forced continuous mode operation at light load. Switching frequency is preset at about 400kHz, and it can be easily modified from 250kHz to 720kHz. An on-board dynamic circuit is also available for transient test.

The LTC3875 is suitable for inputs from 4.5V to 38V and outputs up to 5V. It can provide a high efficiency, high power density and versatile power solution for telecom and datacom systems, industrial and medical instruments, DC power distribution systems and computer systems.The LTC3875 is available in 40-lead 6mm × 6mm and 40-lead 5mm × 5mm QFN packages. Please see LTC3875 data sheet for more detailed information.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC2225A-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	160 A
Voltage In	4.5 ~ 14 V
Efficiency @ Conditions	>89%, 12V in, 1V @ 50 ~ 160 A
Voltage Out Range	0.6 ~ 5 V
Features	Current Foldback Protection Current Limit (Adj. or Fixed) Over Voltage Protection Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Under Voltage Protection, Brown-Out Voltage Tracking
Switching Frequency	250 ~ 720 kHz
Standby Current [Typical]	40 µA
Quiescent Current [Typical]	7 mA
Component Count + Extras	133 + 52
Internal Switch	No
Design Author	Linear Technology
Application / Target Market	Power: Auxiliary Power Supply Servers Telecom
Standby Current [Maximum]	60 µA
Quiescent Current [Maximum]	10 mA
Main I.C. Base Part	LTC3875
Date Created By Author	2016-02
Date Added To Library	2017-01