Small, High-Efficiency Split-Rail Supply Reference Design for Portable Audio Applications


Design files


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.
Output voltage options PMP9781.1
Vin (Min) (V) 2.5
Vin (Max) (V) 5.5
Vout (Nom) (V) 5
Iout (Max) (A) .04
Output Power (W) .2
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost- Synchronous^Linear Regulator
?? View video with transcript Video

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Audio op amps

OPA1612SoundPlus™ Audio Operational Amplifier with 1.1nV/√Hz Noise, Low THD and Precision

Data sheet: PDF | HTML
LCD & OLED display power & drivers

TPS65132Split-Rail, Single Inductor Dual Output Converter with Positive and Negative Outputs

Data sheet: PDF | HTML

Technical documentation

No results found. Please clear your search and try again.
View all 1
Type Title Date
Application note Small High-Efficiency Split-Rail Supply for Portable Audio Applications Jun. 02, 2015

Related design resources

Reference designs

PMP9780 Reference Design: Bipolar TFT LCD Supply Using TPS65131-Q1 and Charge Pumps

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​