LMR24220RB: 3.3V @ 2A, 1.2V @ 1A, 1.8V @ 1A, 5 ~ 32V in


The LMR24220 Multi-Rail reference board implements an extremely compact solution. It is designed to convert from 12V or 24V rails down to typical point-of-load voltages of 3.3V, 1.8V and 1.2V. This design utilizes an LMR24220 Nano Regulator and two LMZ10501 Nano Modules to demonstrate a complete solution for space constrained multi-rail applications.

The LMR24220 Nano Regulator is ideal for intermediate rail conversions and can withstand input voltages up to 42V. It uses a constant on-time (COT) with emulated ripple mode architecture that requires no loop compensation and allows the use of low ESR ceramic capacitors. To further reduce conducted noise on the input supply a pi filter has been implemented on the LMR24220. The LMZ10501 Nano Module is ideal at the point-of-load and uses a current mode architecture combined with an integrated inductor for high efficiency, low noise, and low EMI.

The complete solution size is 20.32 x 13.34 x 2mm with all components placed on a single side. The board can be plugged into a standard 8-pin header with 100 mil spacing and total thickness less than 100mils for ease of prototyping.


Manufacturer Texas Instruments
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Multi Output
Eval Board Part Number 296-LMR24220RB/NOPB-ND
Eval Board Supplier Texas Instruments
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 3 Non-Isolated
Voltage Out: Highest Current First 3.3V, 1.2V, 1.8V
Current Out 2A, 1A, 1A
Voltage In 5 ~ 32 V
Efficiency @ Conditions >80%, 24V in, 3.3V @ 0.3 ~ 1.8 A
>80%, 12V in, 3.3V @ 0.2 ~ 2 A
Voltage Out Range - Not Given
Features Current Limit (Adj. or Fixed)
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 2 MHz
Standby Current [Typical]
Quiescent Current [Typical]
Component Count + Extras 31 + 4
Internal Switch Yes
Design Author Texas Instruments
Application / Target Market Automotive
Point of Load (PoL)
Standby Current [Maximum]
Quiescent Current [Maximum]
Main I.C. Base Part LMR24220
Date Created By Author 2011-10
Date Added To Library 2017-05

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