DC1989B-A: 1V @ 50A, 4.5 ~ 17 Vin, Buck

Summary

Demonstration circuit 1989B-A is a high efficiency, high density, μModule regulator with 4.5V to 17V input range. The output voltage is adjustable from 0.5V to 4V, and it can supply 50A maximum load current. The demo board has two LTM®4676A μModule regulators, and the LTM4676A is a dual 13A or single 26A step-down regulator with PMBus power system management. Please see LTM4676A data sheet for more detailed information.

DC1989B-A powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay™ onto your PC and use LTC’s I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC1989B-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	50 A
Voltage In	4.5 ~ 17 V
Efficiency @ Conditions	>83%, 12V in, 1V @ 5.1 ~ 50 A >80%, 5V in, 1V @ 5 ~ 50 A
Voltage Out Range	0.5 ~ 4 V
Features	Current Limit (Adj. or Fixed) I²C Interface Over Voltage Protection PMBus Interface Shutdown, Enable, Standby Synchronizable Under Voltage Protection, Brown-Out
Switching Frequency	350 kHz
Standby Current [Typical]	50 µA
Quiescent Current [Typical]	40 mA
Component Count + Extras	123 + 41
Internal Switch	No
Design Author	Linear Technology
Application / Target Market	Power: Auxiliary Power Supply
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	- Not Given
Main I.C. Base Part
Date Created By Author
Date Added To Library	2016-12