LED
LCD
Product Description
The JX-887Y is a highly efficient, integrated DC-DC step-up booster and intelligent charging management module designed for building high-performance DIY power banks. Compatible with 3.7V Lithium-Ion (such as 18650 cells) and Lithium-Polymer (Li-Po) batteries connected in parallel, this compact board safely boosts low battery voltages up to a stable 5V DC output. It features dual USB Type-A output ports capable of delivering up to a combined 2A charging current to power smartphones, development boards, and remote IoT nodes. Outfitted with onboard status LEDs and comprehensive protection circuitry against overcharging, over-discharging, and short-circuits, it offers hardware developers and electronics enthusiasts a robust, safe, and space-saving solution for portable power regulation.
Pinout / Layout Connections
The module features clearly labeled surface pads and standard physical ports for straightforward integration:
Battery Input Solder Pads:
B+ Pad: Connects directly to the positive terminal of the 3.7V lithium battery bank.
B- Pad: Connects directly to the negative terminal of the 3.7V lithium battery bank.
Output / Input Interfaces:
Dual USB Type-A Ports (OUT 5V): Provide parallel 5V power distribution channels for dual-device charging up to 2A total.
Micro-USB Port (IN 5V): Serves as the dedicated charging input interface to safely replenish the connected battery bank from a standard 5V power adapter.
Capacity Indicators: Four onboard surface-mount LEDs that display the current battery charge level in 25% steps.
Applications
Custom Power Bank Assembly: Building rugged, high-capacity portable power banks tailored for field use.
Portable Microcontroller Power: Providing a clean, stable 5V power source for mobile Arduino, ESP32, and Raspberry Pi Pi Pico projects.
Field Instrumentation Supply: Powering diagnostic gear, handheld testing arrays, and field sensors.
Robotics & Smart Vehicles: Serving as an onboard step-up voltage regulator for low-power mobile robotic platforms.
Technical Specifications
| Parameter | Value / Specification |
| Standard Part Number | JX-887Y |
| Module Type | DC-DC Step-Up Booster & Li-ion Charger |
| Supported Chemistries | 3.7V Lithium-Ion (18650) / Lithium-Polymer (Li-Po) |
| Battery Input Voltage | DC 3.0 V to 4.2 V |
| Charging Input Interface | 5V Micro-USB |
| Output Voltage | DC 5.0 V ($\pm 5\%$) |
| Maximum Output Current | 2.0 A (Total shared across dual ports) |
| Conversion Efficiency | Up to 88% |
| Protection Systems | Overcharge, over-discharge, overcurrent, and short-circuit protection |
| Status Meter | 4-LED Capacity Indicator ($25\%, 50\%, 75\%, 100\%$) |
