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Overview
The Adafruit TPS65131 Split Rail Boost Converter generates both positive and negative adjustable voltage rails from a single 3–5.5V input, making it ideal for audio, analog, and vintage electronics that need negative bias without bulky transformer supplies.
Onboard trimmer pots let you tune the outputs from approximately +6V to +15V and -6V to -15V, with up to 150mA per rail for biasing and low-power circuits.
Specification
Technical details for Adafruit TPS65131 Split Rail Boost Converter - +6 to -15V and -6 to -15V.
| Specification | Details |
|---|---|
| Converter Type | Dual-output split-rail boost converter (simultaneous positive + negative rails) |
| Input Voltage | 3.0V to 5.5V DC |
| Positive Output Range | Approx. +6V to +15V DC (adjustable via trimmer potentiometer) |
| Negative Output Range | Approx. -6V to -15V DC (adjustable via trimmer potentiometer) |
| Output Current | Up to 150mA per rail (typical at +12V / -12V from 4.5V input) |
| Output Adjustment | 2 onboard trimmer pots (independent adjustment for + and - rails) |
| Best For | Biasing and powering analog/digital electronics, op-amp rails, synthesizers/modular, retro/vintage electronics, LCD/OLED bias |
| Not Recommended For | Motors, solenoids, high-power LED strips, or high-current loads |
| Dimensions | 28.0mm x 19.0mm x 3.5mm |
| Weight | 2.5g |
Pinout
| Pin | Description |
|---|---|
| Vin | Power input pin. Supply 3.0V to 5.5V DC. |
| V+ | Positive voltage output. Adjustable from approximately +6V to +15V. |
| V− | Negative voltage output. Adjustable from approximately −6V to −15V. |
| GND | Common ground for input and both output rails. |
| EN | Enable pin. Tie to GND to disable the TPS65131. |
Trimmer Potentiometers
| Trimmer Pot | Function |
|---|---|
| Positive Voltage Trimmer | Located on the left side of the board. Adjusts the V+ output from approximately +6V to +15V. Labeled +6>15V on the PCB silkscreen. |
| Negative Voltage Trimmer | Located on the right side of the board. Adjusts the V− output from approximately −6V to −15V. Labeled -6>15V on the PCB silkscreen. |
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