LMR24220 5-Watt Multi-Rail Power Supply Reference Board


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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 mm x 13.34 mm x 2 mm 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 100 mils for ease of prototyping.

  • 5V to 32V Input Voltage Range
  • 3.3V / 1.8V / 1.2V Output Voltage Rails
  • Up to 1000 mA Output Current Per Rail
  • Small Solution Size (20.32 mm x 13.34 mm x 2 mm)
  • No External Compensation Require


  • LMR24220RB Reference Board
  • AN-2193 LMR24220 Multi-Rail Reference Board Application Note
AC/DC & DC/DC converters (integrated FET)
LMR24220 42Vin, 2.0A Step-Down Voltage Regulator in micro SMD


Power modules (integrated inductor)
LMZ10501 5.5V, 1A Step-Down DC/DC Power Module in 3mm × 2.6mm Package
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Evaluation board

LMR24220RB/NOPB — LMR24220 5-Watt Multi-Rail Power Supply Reference Board

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Technical documentation

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Type Title Date
Certificate LMR24220RB/NOPB EU Declaration of Conformity (DoC) 02 Jan 2019
User guide AN-2193 LMR24220 Multi-Rail Reference Board (Rev. A) 24 Apr 2013

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