# BQ24041DSQR

**Texas Instruments** · Battery Management · WSON-10-EP(2x2)

BQ24041DSQR from Texas Instruments, in a WSON-10-EP(2x2). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IN | power_in | Input power connected to external DC supply (AC adapter or USB port), with expected bypass capacitors 1μF to 10μF from IN to VSS. |
| 2 | ISET | input | Programs Fast-charge current setting through external resistor from ISET to VSS, defining fast charge current in range 10.8kΩ (50mA) to 540Ω (1000mA). |
| 3 | VSS | power_in | Ground terminal. |
| 4 | ASI | input | Auto start external input with internal 200kΩ pull-down. |
| 5 | PG | output | Open Drain output, Low indicates input voltage is above UVLO and OUT (battery) voltage. |
| 6 | ASO | output | Auto Start Logic Output. |
| 7 | ISET2 | input | Programs Input/Output Current Limit for USB or Adaptor source: High = 410mAmax, Low = ISET, FLOAT = 100mAmax. |
| 8 | CHG | output | Open Drain output, Low (FET on) indicates charging and high-impedance (FET off) indicates no charging or charge complete. |
| 9 | BAT_EN | input | Charge Enable Input (active low). |
| 10 | OUT | power_out | Battery Connection, System Load may be connected, with expected bypass capacitors 1μF to 10μF from OUT to VSS. |
| 11 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WSON-10-EP(2x2) |
| Category | Power Management (PMIC) |
| Pins | 11 |

## CAD (KiCad official)

- Symbol: `BQ24041DSQR`
- Footprint: `Package_DFN_QFN:Texas_DSQ0010A_WSON-10-1EP_2x2mm_P0.4mm_EP0.9x1.5mm`
- 3D model: WSON-10-EP(2x2) (KiCad packages3D, STEP)
- 3D model files: `bq24041dsqr-etched.step` / `bq24041dsqr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bq24041dsqr.step` / `bq24041dsqr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/bq24040) (41 pp, sha256 `02b98f26a3a33997`, retrieved 2026-10-03, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/bq24041dsqr-datasheet.pdf)