Small, High-Efficiency Split-Rail Supply Reference Design for Portable Audio Applications
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Differential Headphone amplifiers require positive and negative voltages. In this reference design, both voltages are generated from a single input voltage with an all integrated split-rail converter. It only requires one inductor and a minimal amount of external components to achieve a high efficiency power supply that keeps the distortion of the system very low. End users benefit from High Fidelity audio performances with longer playback time in their mobile application.

  • 90% Peak Efficiency
  • Tiny solution size: 5.9x6.9 mm
  • Low Distortion: THD+N < 0.00075%
  • Programmable outputs
  • Small BOM — only 7 external components required
  • This circuit design is tested. All necessary software, a Test Report and a Design File are included.

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Schematic/Block Diagram

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Test Data

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Design Files

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(Output Voltage 1)
Vin (Min) (V)2.5
Vin (Max) (V)5.5
Vout (Nom) (V)5
Iout (Max) (A).04
Output Power (W).2
Input TypeDC
TopologyBoost- Synchronous
Linear Regulator

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA1612  SoundPlus™ Audio Operational Amplifier with 1.1nV/√Hz Noise, Low THD and Precision  Operational amplifiers (op amps)  Sample & Buy Not Available
TPS65132  Split-Rail, Single Inductor Dual Output Converter with Positive and Negative Outputs  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA1612 Download Download
TPS65132 Download -
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Technical documentation

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Application note (1)
Title Type Size (KB) Date
PDF 1005 02 Jun 2015
Design files (4)
Title Type Size (KB) Date
ZIP 436 06 Aug 2015
PDF 554 06 Aug 2015
PDF 16 06 Aug 2015
PDF 112 06 Aug 2015
Related Tools & Software

Reference Designs (1)

Name Part Number Tool Type
Reference Design: Bipolar TFT LCD Supply Using TPS65131-Q1 and Charge Pumps  PMP9780  Reference design 

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