Description
The J5019 Adjustable Step-Up Boost Converter Module is a compact DC-DC boost converter with an integrated single-cell Li-ion battery charging and discharge function. It is designed for projects where a lower DC input or 18650 Li-ion battery needs to be used to generate a higher adjustable output voltage.
The module accepts approximately 4.5–8V DC input and provides a continuously adjustable output from approximately 4.3V to 27V DC. The output voltage can be adjusted according to the requirements of your application using the onboard adjustment control.
It can also be used with a 3.7V nominal 18650 Li-ion battery, providing a charging voltage of 4.2V and a maximum charging current of approximately 1A. During battery-powered operation, the discharge/output current is rated up to 2A, although the actual usable output current depends on the selected output voltage, input conditions, battery capability, and module cooling.
Key Features
- J5019 adjustable step-up boost converter module
- Integrated Li-ion battery charging and discharge function
- Suitable for single-cell 3.7V Li-ion / 18650 batteries
- Input voltage: approximately 4.5–8V DC
- Adjustable output: approximately 4.3–27V DC
- Maximum charging current: 1A
- Maximum discharge/output current: 2A
- Charging voltage: 4.2V
- Compact PCB design
- Available with USB or Type-C interface versions depending on stock
- Useful for DIY power supply and battery projects
Adjustable Boost Output
The J5019 can increase the input voltage to a higher adjustable DC voltage. The output can be adjusted within the specified 4.3V to 27V range.
For example, depending on the input and load conditions, the module can be configured for commonly required voltages such as:
- 5V
- 9V
- 12V
- Other adjustable voltages within the module’s specified range
Important: The module is a boost converter, so the output voltage cannot be set below the applicable minimum output specification. The available output current also varies with input voltage, output voltage, battery condition, and load.
Li-ion Battery Charging
The J5019 supports charging of a compatible single-cell 3.7V nominal Li-ion battery, such as an 18650 cell.
The listed charging parameters are:
- Charging voltage: 4.2V DC
- Maximum charging current: 1A
When using an 18650 cell, make sure the battery is a suitable rechargeable Li-ion cell and that the battery is connected with the correct polarity.
Discharge / Boost Function
When powered from a compatible Li-ion battery, the module can boost the battery voltage to a higher DC output voltage for suitable loads.
The listed maximum discharge/output current is 2A, but this should not be interpreted as 2A being available at every output voltage. For higher output voltages, the input battery must supply more power, so the practical output current will be lower.
The product listing gives the following example reference values:
| Output Voltage | Reference Maximum Current |
|---|---|
| 5V | Approx. 1.4A |
| 9V | Approx. 0.8A |
| 12V | Approx. 0.6A |
These values are reference figures from the supplied product information and can vary with input voltage, battery condition, efficiency, and load.
Specifications
| Specification | Details |
|---|---|
| Module | J5019 / HW357-type Module |
| Module Type | Step-Up Boost Converter + Li-ion Charger |
| Input Voltage | 4.5–8V DC |
| Adjustable Output Voltage | 4.3–27V DC |
| Charging Voltage | 4.2V DC |
| Maximum Charging Current | 1A |
| Maximum Discharge Current | 2A |
| Suitable Battery | Single-cell 3.7V Li-ion / 18650 |
| Overcurrent Protection | Yes |
| Quiescent Current | Approx. 0.5mA |
| Size | Approx. 3.3 × 2.3 × 0.9cm |
| Interface | USB or Type-C version, depending on stock |
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