Small Split Rail Isolated + - 5V Power Supply Generator
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Key Document


A very low noise differential power supply for split rail systems requiring +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. This design is a smaller version of RD-171. Design uses smaller components on only one side of a double sided FR4 PCB.

This design provides low noise bias rails for ground referenced analog circuitry (under 2 mV p-p ripple noise up to 1 GHz). 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.

  Input Range Output 1 Output 2
  LM5001    Min 10V     5V     -5V  
  Max 29V     250 mA  
  250 mA  

The performance of the reference design is as follows:

  • Very Low Noise, <20 mV P-P
  • Fully Isolated Outputs, > 500V
  • Small Size
  • Wide Input Range 10V - 29V
  • Double sided PCB
  • 600 KHz Operation



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Small Split Rail Isolated + - 5V Power Supply Generator


TI Devices (2)

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
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)
LM5001 Download Download
Download Download
LM5002 Download Download
Download Download

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Technical documentation
User guides (1)
Title Type Size (KB) Date
PDF 1251 27 Jan 2012
Design files (1)
Title Type Size (KB) Date
ZIP 307 27 Jan 2012

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