DC-DC Buck-Boost Module 4.5–21V to 5V, 3A Current Limit
DC-DC Buck-Boost Module 4.5–21V to 5V, 3A Current Limit
DC-DC Buck-Boost Converter Module — Stable 5V Output from 4.5–21V Input
The DC-DC Buck-Boost Module is a compact, high-efficiency power conversion board designed to deliver a rock-solid 5V output regardless of whether your input voltage is above, below, or equal to 5V. With a wide input range of 4.5–21V and a built-in 3A constant current limit, this module is a versatile solution for DIY electronics, battery-powered projects, LED driver circuits, and lithium battery management systems.
Made in Mainland China.
Key Features
- Wide Input Range: Accepts 4.5–21V (recommended 5–20V), compatible with a broad range of power sources and battery packs.
- True Buck-Boost Topology: Non-isolated PFM buck-boost design steps voltage up or down as needed — no dropouts when input approaches output voltage.
- 3A Adjustable Current Limit: User-definable output current from 0–3A (max 3A) with constant current output — ideal for LED driving, battery charging, and load-sensitive circuits.
- Lithium Battery Voltage Stabilization: Optimized for single and multi-cell lithium battery packs to help maintain stable voltage during charging and discharging cycles, extending cell service life.
- Comprehensive Protection: Built-in under-voltage, input/output current limiting, over-temperature, and short-circuit protection for safe, reliable operation.
- UART Control Interface: Supports external low-level trigger and UART (TX, RX, GND) commands for programmable, automated control.
- Low Output Ripple: <30mV output ripple at 460kHz switching frequency for clean, stable power delivery.
- Wide Operating Temperature: Functions reliably from -40°C to +85°C with natural air cooling.
Full Specifications
| Type | Non-Isolated Buck-Boost |
| Working Mode | PFM |
| Input Voltage | 4.5–21V (recommended 5–20V) |
| Output Voltage | 5V (±0.05V accuracy) |
| Input Current (Peak) | <10A |
| Output Current Limit | 0–3A (user-definable, max 3A) |
| Line Compensation | 50mV/A |
| Switching Frequency | 460kHz |
| Output Ripple | <30mV |
| Standby Current | <5mA |
| Control Interface | UART (TX, RX, GND) |
| Output Control | External low-level trigger / UART command |
| Operating Temperature | -40°C to +85°C |
| Cooling | Natural air |
| Color | Green |
| Material | PCB |
Package Contents
- 1 × DC-DC Buck-Boost Module
Note: Battery, charger, and PCB enclosure are not included. Slight color variations may occur due to lighting and display differences. Dimensional tolerance: ±1–3cm.
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Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: What is a DC-DC buck-boost module and what makes it different from a regular voltage regulator?
A: A DC-DC buck-boost module can both step voltage up (boost) and step it down (buck), unlike a standard linear regulator that can only reduce voltage. This means it maintains a stable 5V output even when the input voltage fluctuates above or below 5V — making it highly versatile for battery-powered projects and variable power supplies.
Q: Can this module be used to charge lithium batteries?
A: Yes. The module is optimized for lithium battery applications. Its adjustable 0–3A constant current output and built-in protections (under-voltage, over-temperature, and short-circuit) make it suitable for managing and stabilizing voltage during lithium battery charging and discharging cycles.
Q: How do I control the output current limit on this module?
A: The output current limit is user-definable from 0 to 3A. You can set it either via an external low-level trigger signal or through UART serial commands (TX, RX, GND interface), giving you flexible, programmable control for automated or embedded systems.
Q: What protections does this buck-boost module include?
A: This module features comprehensive onboard protection including under-voltage lockout, input and output current limiting, over-temperature shutdown, and short-circuit protection — ensuring the safety of both the module and connected loads.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.