# BQ25890RTWT

**Texas Instruments** · Battery Management · WQFN-24-EP(4x4)

BQ25890RTWT from Texas Instruments, in a WQFN-24-EP(4x4). 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 | VBUS | power_in | Input supply voltage (3.9V to 14V); requires 1µF bypass capacitor to PGND. |
| 2 | D+ | bidirectional | USB D+ data line for port type detection via BC1.2 protocol. |
| 3 | D- | bidirectional | USB D- data line for port type detection via BC1.2 protocol. |
| 4 | STAT | output | Open-drain charge status indicator; LOW during charging, HIGH when complete, blinks 1Hz on fault. |
| 5 | SCL | input | I2C serial clock input; pull up with 10kΩ resistor to logic rail. |
| 6 | SDA | bidirectional | I2C serial data line; pull up with 10kΩ resistor to logic rail. |
| 7 | INT | output | Open-drain interrupt output; active-low 256µs pulse on device status or fault events. |
| 8 | OTG | input | Boost mode enable input (active HIGH); activates 5V USB OTG when OTG_CONFIG=1. |
| 9 | CE | input | Charge enable input (active LOW); charging enabled when CHG_CONFIG=1 and CE is LOW. |
| 10 | ILIM | input | Input current limit analog input; 0.8V reference sets maximum input current via resistor to ground. |
| 11 | TS | input | Temperature sensor analog input; connect 103AT-2 NTC thermistor for battery charge temperature monitoring. |
| 12 | QON | input | BATFET enable/reset control input (active LOW); exits shipping mode or performs system reset. |
| 13 | BAT | power_in | Battery positive terminal; internal BATFET connects to SYS; requires 10µF decoupling capacitor. |
| 14 | BAT | power_in | Battery positive terminal; internal BATFET connects to SYS; requires 10µF decoupling capacitor. |
| 15 | SYS | power_out | System power output regulated above 3.5V minimum or 100mV above battery voltage; requires 20µF capacitor. |
| 16 | SYS | power_out | System power output regulated above 3.5V minimum or 100mV above battery voltage; requires 20µF capacitor. |
| 17 | PGND | power_in | Power ground for high-current switching converter; connect to ground plane and input/output capacitor returns. |
| 18 | PGND | power_in | Power ground for high-current switching converter; connect to ground plane and input/output capacitor returns. |
| 19 | SW | power_out | Switching node (HSFET source and LSFET drain); connects to external inductor and 0.047µF bootstrap capacitor to BTST. |
| 20 | SW | power_out | Switching node (HSFET source and LSFET drain); connects to external inductor and 0.047µF bootstrap capacitor to BTST. |
| 21 | BTST | power_out | Bootstrap supply for high-side gate driver; connect 0.047µF capacitor between SW and this pin. |
| 22 | REGN | power_out | 6V low-side gate driver and temperature sensor bias supply output; requires 4.7µF (10V rated) capacitor to ground. |
| 23 | PMID | output | Input power distribution node (RBFET and HSFET drain connection); attach bypass capacitance to PGND. |
| 24 | DSEL | output | Open-drain D+/D- multiplexer selection output (active LOW); stays LOW if MaxCharge adapter detected. |
| 25 | PowerPAD | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-24-EP(4x4) |
| Category | Power Management (PMIC) |
| Pins | 25 |

## CAD (KiCad official)

- Symbol: `BQ25890RTWT`
- Footprint: `Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm`
- 3D model: WQFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files: `bq25890rtwt-etched.step` / `bq25890rtwt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bq25890rtwt.step` / `bq25890rtwt.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/bq25892) (70 pp, sha256 `2e8c133466478bb3`, retrieved 2026-10-07, 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/bq25890rtwt-datasheet.pdf)