DC1989B-B: 2x 0.5 ~ 4V @ 75A, 4.5 ~ 17 Vin, Buck

Summary

Demonstration circuit 1989B-B 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 75A maximum load current. The demo board has three 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 datasheet for more detailed information.

DC1989B-B 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 - Multi Output
Eval Board Part Number	DC1989B-B-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	2 Non-Isolated
Voltage Out: Highest Current First	0.5 ~ 4V (x2)
Current Out	75A per Channel
Voltage In	4.5 ~ 17 V
Efficiency @ Conditions	>83%, 5V in, 1V @ 8 ~ 75 A >80%, 12V in, 1V @ 20 ~ 75 A
Voltage Out Range	0.5 ~ 5.5 V
Features	Current Limit (Adj. or Fixed) Current Sharing GUI / Design Software Over Voltage Protection Shutdown, Enable, Standby Soft Start Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	350 kHz
Standby Current [Typical]	20 mA
Quiescent Current [Typical]	40 mA
Component Count + Extras	132 + 57
Internal Switch	Yes
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	LTM4676A
Date Created By Author	2016-03
Date Added To Library	2017-07