Overview
This tiny buck converter breakout is based on the TPS62827 from Texas Instruments and designed by Adafruit to efficiently deliver a fixed 3.3V output at up to 2A from input voltages up to 5.5V. It’s ideal for powering current-hungry 3.3V circuits from LiPo batteries, 3× alkaline cells, or USB power.
With 90–95% efficiency, it runs far cooler than linear regulators and is pin-compatible with LM1117-3.3V, making it an easy drop-in upgrade for existing designs. The onboard EN pin allows complete shutdown for power saving, while the 2.2 MHz switching frequency and 2 oz copper PCB ensure stable performance at up to 2A continuous current (≈3A peak).
A reliable, efficient power solution for portable and space-constrained 3.3V projects.
Specification
Technical details for Adafruit TPS62827 3.3V DC Buck Converter Breakout - 2A Max Output
| Specification | Details |
|---|---|
| Regulator Type | Buck (Step-Down) Switching Regulator |
| Regulator IC | TPS62827 |
| Output Voltage | 3.3V (Fixed) |
| Input Voltage | Up to 5.5V (Best performance across 3.4V to 5.5V) |
| Continuous Output Current | Up to 2A (recommended max for sustained load) |
| Peak Output Current | Up to ~3A (short bursts) |
| Switching Frequency | 2.2 MHz (Fixed) |
| Efficiency | Typically 90–95% (application dependent) |
| Enable Control | EN pin (LOW = shutdown, HIGH = enabled) |
| Pin Compatibility | Pin-compatible with LM1117-3.3V TO-220 footprint (drop-in upgrade) |
| PCB Construction | 2-layer PCB, 2 oz copper |
| Typical Power Sources | 1S LiPo/Li-ion, 3× alkaline cells, 5V USB |
| Use Cases | Powering 3.3V microcontrollers, sensors, radios, and other high-current 3.3V circuits |
Pinout
| Pin | Description |
|---|---|
| GND | Ground reference for power and logic. Connect to system ground. |
| 3V | Regulated 3.3V output. Provides up to 2A continuous current. |
| VIN | Input voltage pin. Accepts 3.4V to 5.5V from battery or USB power. |
| EN | Enable pin. Pull HIGH (or leave floating) to enable output, pull LOW to shut down the regulator. |
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