± 5V Isolated, Low Noise Split Rail Generator (0.25A, 2.5W total)
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A very low noise differential power supply for split rail systems requiring low noise +5V and -5V (higher or lower voltage is possible). This design is fully isolated and capable of floating to over 500V differential from Vin to Vout (higher is possible). The LM5001 IC is a fully integrated flyback regulator which performs all of the current mode control for tight regulation and transient response. The design is small and uses only one side of a double sided FR4 PCB for components. Smaller IC packages are available so the layout can be further optimized.

This design provides very low noise bias rails for ground referenced analog circuitry (under 20 mV p-p total noise up to 1GHz). The design utilizes a very small size PCB footprint. This approach is ideal for many applications including low noise cable drivers, medical electronics, high fidelity low power audio, and other sensitive circuitry that can benefit from very low noise split rail biasing. Input to output isolation is employed for those applications where the input and output voltages might be at different potentials or when the input voltage travels across cabling which might pickup noise. The floating outputs avoid unwanted ground currents and the potential for additional noise pickup. For those that do not require isolation they can remove the feedback isolation section of the design and use a simple resistor divider for setting the feedback voltage.

InputsOutput #1Output #2
  VinMin = 10V     Vout1 = 5V     Vout2 = -5V  
  VinMax = 30V     Iout1 = 0.25A     Iout2 = 0.25A  
  • Very Low Noise, < 20 mVP-P
  • Fully Isolated Outputs, > 500V
  • Small Size
  • Wide Input Range > 10V to 30V
  • Double sided PCB
  • 600 KHz Operation


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± 5V Isolated, Low Noise Split Rail Generator (0.25A, 2.5W total)


TI Devices (3)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM431  2%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
LM5001  3.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode Regulator  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
LM5002  3.1-75V Wide Vin, 0.5A Current Mode Boost, Flyback, Sepic Converter  Step-up (boost) regulators  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM431 Download Download
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LM5001 Download Download
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LM5002 Download Download
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Technical documentation
User guide (1)
Title Type Size (KB) Date
PDF 1093 27 Jan 2012

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