2 layers47.4 × 39.8 mm
2 layers40 × 11.5 mm
Li ion charger design
Harshavar8jdm/1S-Li-ion-Battery-Charger-ModuleA single-cell (1S) Lithium-Ion / Lithium-Polymer battery charging PCB based on the Texas Instruments BQ24092 linear charger IC.
- Size
- 40 × 11.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 22
- Pads
- 62
- Tracks, vias
- 52, 9
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 24 Jul 2026
- Updated
- 25 Jul 2026
Overview
Li ion charger design is an open-source printed circuit board by Harshavar8jdm, from the Harshavar8jdm/1S-Li-ion-Battery-Charger-Module repository on GitHub. It is a 2-layer board of 40 × 11.5 mm with 14 parts on 22 nets, routed with 52 tracks and 9 vias.
It is built around the BQ24092DGQT. Its parts include 7 resistors, 2 capacitors, 2 diodes, 2 connectors and 1 IC. It belongs with the power boards of this library.
Main components
1README
readme.md1S Li-Ion USB-C Battery Charger Module (1A)
A single-cell (1S) Lithium-Ion / Lithium-Polymer battery charging PCB based on the Texas Instruments BQ24092 linear charger IC. The board uses a USB Type-C connector for 5V input, status LEDs for charge monitoring, and a 2-pin right-angle JST connector for battery attachment.
Visual Overview
| Top Render | Bottom Render |
|---|---|
 |  |
Hardware Design Files
Schematic
PCB Layout
Features
- Dimensions: 40 x 11.5 x 5.5 mm board layout.
- USB Type-C Input: Uses a 16-pin USB-C receptacle with CC pull-down resistors for standard 5V power negotiation.
- 1A Charge Rate: Configured for 1000 mA maximum charge current.
- Status LEDs: On-board LEDs for Power Good (
PG) and Charging (CHG) indication. - Battery Interface: 2-pin JST connector (
J1) for single-cell battery connection. - Thermal Design: Includes a bottom-layer ground pour and 5 thermal vias directly beneath the thermal pad of the charger IC.
Specifications
| Parameter | Value |
|---|---|
| Input Voltage ($V_{IN}$) | 5.0 V DC (via USB Type-C) |
| Charger IC | TI BQ24092DGQT (MSOP-PowerPAD-10) |
| Charge Current ($I_{CHG}$) | 1000 mA (1A) |
| Compatible Battery | 1S Li-Ion / Li-Po (3.7V Nominal, 4.2V Max) |
| Input Connector | 16-Pin USB 2.0 Type-C Receptacle (J2) |
| Output Connector | 2-Pin Right-Angle JST Header (J1) |
| Board Dimensions | 40.0 x 11.5 x 5.5 mm |
| EDA Tool | KiCad 10.0.8 |
Circuit Details and Components
U1(BQ24092DGQT): Linear charger IC handling battery protection and charge profile management.R5($I_{SET1}$): $540,\Omega$ resistor setting the constant current phase ($I_{CHG}$) to 1000 mA.R_PRETERM: $2\text{ k}\Omega$ resistor setting the pre-charge and termination current threshold.R_TS: $10\text{ k}\Omega$ resistor pulling down the temperature sense pin when an external NTC thermistor is not used.C1: $1\mu\text{F}$ input decoupling capacitor.C2: $4.7\mu\text{F}$ output filter capacitor.R1,R2: $1.5\text{ k}\Omega$ current-limiting resistors for thePGandCHGLEDs.
Connections and Usage
- Connect a 5V power supply using a standard USB Type-C cable to receptacle
J2. - Attach a 1S Li-Ion battery to connector
J1. Verify that the battery positive wire connects toBATT+and the negative wire connects toBATT-.
Thermal Management
Because the BQ24092 is a linear charger, power dissipation depends on the voltage difference between input and battery voltage multiplied by the charging current ($P_{diss} = (V_{IN} - V_{BAT}) \times I_{CHG}$).
To manage thermal buildup during 1A charging, the board uses 5 thermal vias placed directly under the exposed pad of the IC, sinking heat into the bottom ground plane.
Project Information
- Title: 1S Li-ion Battery Charge Module Design
- Author: Harsha (HTronics)
- Revision: V1.0
- Date: 2026-07-06
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1.5K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | 4.7K | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 1 | 10K | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 2K | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 540 | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | BQ24092DGQT | BQ24092DGQT:IC_XTR111AIDGQR | U1 |
| 1 | Battery_JST | S2B-PH-K-S_LF__SN_:JST_S2B-PH-K-S_LF__SN_ | J1 |
| 1 | CHG_LED | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | PGOOD_LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
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Questions
How big is the Li ion charger design PCB?
It measures 40 × 11.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Li ion charger design use?
14 parts, built around the BQ24092DGQT. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Li ion charger design KiCad files?
From the Harshavar8jdm/1S-Li-ion-Battery-Charger-Module repository on GitHub, at the commit this page was made from: the board is Li-ion-charger-design.kicad_pcb and its schematic Li-ion-charger-design.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Li ion charger design design in my own project?
Its repository states no licence, so its author keeps all rights: ask Harshavar8jdm before reusing the design.