LMR12010YMKDEMO: 1.8V @ 1A, 3 ~ 5V in

Summary

The LMR12010 is a step down DC-DC regulator that operates at the following switching frequencies: the LMR12010X at 1.6MHz and the LMR12010Y at 3MHz. The demo board is configured to convert 5V input to 1.8V output at 1A load current using the Y version. The tiny low profile thin SOT23 package allows the design to use less than 1 square inch of board area.

The circuit is configured with the boost diode connected to VIN. VIN must not exceed the maximum operating limit of 5.5V + VfD2 using this configuration. This will ensure that the voltage between the Boost and SW pins, VBOOST - VSW, does not exceed 5.5V for proper operation. Please see the LMR12010 datasheet for more information regarding this requirement.

The schematics at the end of the application note show how to reconfigure this demo board for various input and output conditions as discussed in the LMR12010 datasheet. Short or leave open the connections as indicated in the schematics. The above restrictions for the input voltage are valid only for the demo board as shipped with the demo board schematic.

Specifications

Manufacturer	Texas Instruments
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	LMR12010YMKDEMO/NOPB-ND
Eval Board Supplier	Texas Instruments
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	1.8 V
Current Out	1 A
Voltage In	3 ~ 5 V
Efficiency @ Conditions	>77%, 3.3V in, 1.8V @ 100 ~ 500 mA >74%, 5V in, 1.8V @ 0.2 ~ 1 A >70%, 3.3V in, 1.8V @ 0.05 ~ 1 A
Voltage Out Range	- Not Given
Features	Shutdown, Enable, Standby Soft Start Thermal Protection
Switching Frequency	3 MHz
Standby Current [Typical]	30 nA
Quiescent Current [Typical]	1.7 mA
Component Count + Extras	10 + 5
Internal Switch	Yes
Design Author	Texas Instruments
Application / Target Market	Point of Load (PoL) Portable Devices RF: Metering
Standby Current [Maximum]
Quiescent Current [Maximum]	2.5 mA
Main I.C. Base Part	LMR12010Y
Date Created By Author	2011-09
Date Added To Library	2012-02