ET-P02
BQ24074 Solar / USB-C Charger
Solar and USB-C LiPo charger with power path
AED 49.00
Out of stockOverview
Solar and USB-C LiPo charger with power path
The ET-P02 is built around the TI BQ24074: 1.5A-capable linear charger, power path (system runs from input, battery tops up), 10.5V OVP, DPPM for weak solar panels.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Solar-powered sensor nodes
- Projects that run while charging
- Outdoor data loggers
Key features
What makes it different
Charger
TI BQ24074: 1.5A-capable linear charger, power path (system runs from input, battery tops up), 10.5V OVP, DPPM for weak solar panels
Inputs
USB-C 5V and 2-pin terminal 5–10V (6V solar panel), diode-OR'ed
Currents
Input limit 0.89A; charge 0.49A (JP2 open) or 0.99A (JP2 closed)
Output
OUT = 4.4V regulated when input present, else battery
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Charger | TI BQ24074: 1.5A-capable linear charger, power path (system runs from input, battery tops up), 10.5V OVP, DPPM for weak solar panels |
|---|---|
| Inputs | USB-C 5V and 2-pin terminal 5–10V (6V solar panel), diode-OR'ed |
| Currents | Input limit 0.89A; charge 0.49A (JP2 open) or 0.99A (JP2 closed) |
| Output | OUT = 4.4V regulated when input present, else battery |
| Size | 38.1 × 25.4 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 7-pin 2.54 mm header · USB-C 16P receptacle (USB 2.0) — USB-C power input · Screw terminal 2P 5.0mm 17A (THT) — Solar / DC input 5–10V · JST PH 2P R/A SMD (LiPo) — LiPo battery |
| Main IC | BQ24074RGTR (LCSC C54313) |
| Revision | Rev A |
| JP1 (default Closed) | Cut and connect a 10k NTC (B=3435) from TS to GND for battery temperature protection |
|---|---|
| JP2 (default Open) | Close for ~1A charge (cells ≥ 1000mAh); input limit stays 0.89A |
Performance
Current limits
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUT | Power | System output (4.4V regulated / battery) |
| 2 | GND | Ground | Ground |
| 3 | VBAT | Power | Battery + |
| 4 | CE | Control | High = stop charging |
| 5 | TS | Control | 10k NTC to GND (cut JP1) |
| 6 | PGOOD | Output | Low = input present |
| 7 | CHG | Output | Low = charging |
I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-P02 BQ24074 Solar / USB-C Charger (assembled)
- 1 × 7-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: OUT, GND, VBAT, CE, TS, PGOOD
Compare
Which battery board?
| BQ24074 Solar / USB-C Charger (this board)This board | ET-P01 MCP73831 USB-C LiPo Charger | ET-P09 LiPo Power Bank Module | ET-P08 1S LiPo Protection Board | |
|---|---|---|---|---|
| What it does | Solar and USB-C LiPo charger with power path | 500 mA / 100 mA single-cell LiPo charger, USB-C | USB-C charger plus 5 V 1 A boost | Over-charge, over-discharge and short protection, 4 A |
| Interface | USB-C 5V and 2-pin terminal 5–10V (6V solar… | USB-C 5V (Rd 5.1k → any USB-C source gives 5V);… | — | — |
| Best for | Solar-powered sensor nodes | Charging LiPo cells for wearables | Portable 5 V projects | Protecting bare 18650 and LiPo cells |
| Price | 49 AED | 22 AED | 49 AED | 9 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.