DC1939A: 2.5V @ 5A, 6 ~ 36V in, Buck

Summary

Demonstration circuit 1939 is a 36V, 5A, 2-quadrant CVCC step-down μModule® regulator featuring the LTM®8052A. The demo circuit is designed for a 2.5V output from an input voltage range of 6V to 36V. The output can source 5A or sink 5A. The circuit can be operated in either constant voltage mode or constant current mode.

When the output sinks current, the circuit maintains its output voltage regulation by power conversion, not power dissipation. This means that the energy provided to LTM8052A is in turn delivered to its input power bus.

There must be something on the input power bus to accept or use the energy.

The LTM8052A data sheet gives a complete description of the part, operation and application information. The datasheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit 1939.

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	505-DC1939A-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	2.5 V
Current Out	5 A
Voltage In	6 ~ 36 V
Efficiency @ Conditions	>85%, 6V in, 2.5V @ 0.2 ~ 4.8 A >85%, 12V in, 2.5V @ 0.9 ~ 4.3 A >80%, 24V in, 2.5V @ 1.2 ~ 5 A >78%, 36V in, 2.5V @ 2 ~ 5 A
Voltage Out Range	1.2 ~ 24 V
Features	Current Limit (Adj. or Fixed) Over Voltage Protection Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	450 kHz
Standby Current [Typical]	100 nA
Quiescent Current [Typical]	17 mA
Component Count + Extras	14 + 17
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Battery Chargers Lighting: LED Commercial Lighting Lighting: LED Home Lighting Lighting: LED Street Lighting Motor Control
Standby Current [Maximum]	3 µA
Quiescent Current [Maximum]	30 mA
Main I.C. Base Part	LTM8052A
Date Created By Author	2012-07
Date Added To Library	2015-03