DC960A: 5V @ 2A, 5.5 ~ 60V in, Buck

Summary

Demonstration circuit 960 is a high voltage, current mode DC/DC step down converter featuring the LTC3824 in a small 10-pin MSOP package.

The board operates from a Vin range of 5.5 ~ 60 V and outputs 5V @ 2A. The converter uses a P-ch MOSFET for the main switch resulting in a low parts count design. Operating frequency is set to 200 kHz with the option to accept a synchronized external clock. A soft-start feature controls the output voltage slew rate at start-up, reducing current surges and voltage over-shoots. Burst mode operation that improves the efficiency at light loads can be enabled with a jumper. The demonstration board has been laid out with the option for adding a second switching MOSFET to facilitate higher output currents.

This board is suitable for a wide range of industrial control systems and particularly suitable for 12V/42V automotive applications and 48V telecom power supplies.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	DC960A-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	5 V
Current Out	2 A
Voltage In	5.5 ~ 60 V
Efficiency @ Conditions	>85%, 12V in, 5V @ 0.01 ~ 2 A >75%, 40V in, 5V @ 0.02 ~ 2 A
Voltage Out Range	- Fixed
Features	Current Limit (Adj. or Fixed) Shutdown, Enable, Standby Soft Start Synchronizable
Switching Frequency	200 kHz
Standby Current [Typical]	9 µA
Quiescent Current [Typical]	800 µA
Component Count + Extras	22 + 12
Internal Switch	No
Design Author	Linear Technology
Application / Target Market	Automotive Power: Auxiliary Power Supply Power: Industrial Power Telecom
Standby Current [Maximum]	20 µA
Quiescent Current [Maximum]	1.3 mA
Main I.C. Base Part	LTC3824
Date Created By Author	2005-11
Date Added To Library	2015-06