Overview

The 3.7V 2A adjustable step-up converter combines a TP4056-based Li-ion charger, a boost regulator, and a basic BMS module. It is designed to take a low DC input and provide a selectable higher output suitable for powering devices such as Wi-Fi routers.

Specifications

Input voltage: 4.5 to 8 V DC
Output voltage: Continuously adjustable 4.3–27 V
Boost direction: Counter-clockwise to increase voltage
Maximum output current: up to 1.4 A at 5 V, 0.8 A at 9 V, 0.6 A at 12 V
Charging voltage: 4.2 V DC
Charging current: up to 1 A
Discharge current: up to 2 A
Quiescent current: ~0.5 mA
Over-overshoot protection: Yes
Over-discharge protection: None
Dimensions: 33 × 23 × 2 mm

This compact module uses a TP4056-based charger to manage a single 18650 Li-ion cell, with a boost converter to deliver adjustable output voltages from 4.2 V up to 27 V. It is commonly used to power Wi‑Fi routers and other low-power devices from a single Li-ion cell.

The unit supports a maximum charging current of 1 A and a discharge current up to 2 A, making it suitable for lightweight power applications. Please note that protection features include overshoot protection, but there is no over-discharge protection provided in this module.

Note: Ensure proper handling of Li-ion cells and follow safety guidelines when connecting and using this module.

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3.7V 2A 18650 Adjustable Step-Up Converter, Battery Charger and BMS Module J5019 for Wi-Fi Routers