RD-155 - LM20145: 2.5V @ 5A, 2.95 ~ 5.5 V in, 88%

Summary

The LM20145 demonstration board has been designed to balance overall solution size with the efficiency of the regulator.

The demonstration board measures just 1.0” x 1.0” on a two layer PCB, with all components placed on the top layer. The power stage and compensation components of the LM20145 demonstration board have been optimized for an input voltage of 5V, but for testing purposes, the input can be varied across the entire operating range.

The output voltage of the evaluation board is nominally 2.5V. The control loop compensation of the LM20145 demonstration board has been designed to provide a stable solution over the entire input and output voltage range with a reasonable transient response.

The EN pin is connected to VIN through a 100kOhm resistor which will enable the device when power is applied. Refer to the LM20145 datasheet for complete circuit design information.

Specifications

Manufacturer	Texas Instruments
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board	Board not Stocked
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	2.5 V
Current Out	5 A
Voltage In	2.95 ~ 5.5 V
Efficiency @ Conditions	>88%, 5V in, 2.5V @ 400 mA ~ 5 A >88%, 3.3V in, 2.5V @ 0.2 ~ 5 A
Voltage Out Range
Features	Current Limit (Adj. or Fixed) Over Current Protection Over Voltage Protection Power Good Output Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	500 kHz
Standby Current [Typical]
Quiescent Current [Typical]	3.5 mA
Component Count + Extras	15 + 3
Internal Switch	Yes
Design Author	Texas Instruments
Application / Target Market	Computers Point of Load (PoL)
Standby Current [Maximum]	180 µA
Quiescent Current [Maximum]	6 mA
Main I.C. Base Part	LM20145
Date Created By Author
Date Added To Library	2011-03