DC2000A: 1V @ 30A + 1.5V @ 30A, 4.5 ~ 14V in, Buck

Summary

Demonstration circuit 2000A is a high efficiency, high density, synchronous buck converter with a 4.5V to 14V input range. It can supply 30A maximum load current at a 1.0V output and at a 1.5V output separately. The demo board includes a LTC®3875EUJ controller. The LTC3875 is a feature-rich dual phase synchronous buck controller with very low DCR current sensing capability, on-chip drivers and remote output voltage sensing.

This board is set up with a 0.32mΩ DCR inductor. The temperature compensation function can guarantee accurate current limit over a wide temperature range with DCR sensing.

The LTC3875 is suitable for inputs from 4.5V to 38V and outputs up to 3.5V. 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 a 40-pin 6mm × 6mm QFN package.To shut down the converter, set the RUN1/RUN2 pin voltage below 1.2V (SW1: OFF; SW2: OFF). Use the JP1 jumper to select burst mode, pulse-skipping mode or forced continuous mode operation at light load. Switching frequency is pre-set at about 400kHz, and it can be easily modified from 250kHz to 770kHz. An on-board dynamic circuit is also available for the transient test. Please see the LTC3875 data sheet for more detailed information.

Specifications

Manufacturer Analog Devices Inc.
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Part Number DC2000A-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 2 Non-Isolated
Voltage Out: Highest Current First 1V, 1.5V
Current Out 30A per Channel
Voltage In 4.5 ~ 14 V
Efficiency @ Conditions >90%, 4.5V in, 1V @ 2 ~ 14 A
>90%, 4.5V in, 1.5V @ 1.5 ~ 19 A
>90%, 12V in, 1.5V @ 5 ~ 28 A
>85%, 12V in, 1V @ 4 ~ 30 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
Voltage Tracking
Switching Frequency 250 ~ 720 kHz
Standby Current [Typical] 40 µA
Quiescent Current [Typical] 7 mA
Component Count + Extras 87 + 34
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 2013-10
Date Added To Library 2017-02

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