DC1753B-B: 0.5V ~ 3.3V @ 40A, 6.5 ~ 24 Vin, Preset @ 1.8V Out

Summary

Demonstration circuit 1753B is a dual phase single-output, synchronous buck converter featuring the LTC®3880EUJ, a dual phase current mode controller with digital power system management. There are two versions of the board available: DC1753B-A: senses inductor current across a sense, resistor and has a default switching Freq of 350kHz; DC1753B-B: senses inductor current with the inductor DCR and has a default switching Freq of 425kHz.

Either version can be populated with the LTC3880EUJ-1, which allows the user to provide bias power to the IC from an external power supply.

The output voltage of the board can be programmed from 0.5V to 3.3V, with output current up to 40A. The factory default setting for the output is 1.8V.

The DC1753B 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 aspects of the LTC3880.

To fully explore the extensive digital power management features of the part, download the LTpowerPlay™ GUI software 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	DC1753B-B-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	1.8 V
Current Out	40 A
Voltage In	6.5 ~ 24 V
Efficiency @ Conditions	>91%, 12V in, 1.8V @ 15.2 ~ 40 A >90%, 12V in, 1.5V @ 15.2 ~ 38 A >88%, 12V in, 1.2V @ 14 ~ 40 A >87%, 12V in, 1.0V @ 15 ~ 36 A
Voltage Out Range	0.5 ~ 3.3 V
Features	ADC's for Sensor Reading Current Limit (Adj. or Fixed) Fault Indication GUI / Design Software I²C Interface Over Voltage Protection PMBus Interface Soft Start Synchronizable Under Voltage Protection, Brown-Out
Switching Frequency	425 kHz
Standby Current [Typical]	- Not Given
Quiescent Current [Typical]	20 mA
Component Count + Extras	67 + 83
Internal Switch	No
Design Author	Linear Technology
Application / Target Market	Power: Auxiliary Power Supply Telecom
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	- Not Given
Main I.C. Base Part	LTC3880
Date Created By Author	2014-07
Date Added To Library	2016-09