# BQ7790505PWR

**Texas Instruments** · Battery Management · TSSOP-20

BQ7790505PWR from Texas Instruments, in a TSSOP-20. 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 | VDD | power_in | Supply voltage input with a recommended operating range of 3 V to 25 V. |
| 2 | AVDD | power_out | Analog supply that should only be connected to a capacitor, with a recommended range of 0 V to 3 V. |
| 3 | VC5 | input | Cell voltage sense input with a recommended VC5-VC4 range of 0 V to 5 V; the datasheet requires pin 3 to be connected to pin 4 only on the BQ77904. |
| 4 | VC4 | input | Cell voltage sense input with a recommended VC5-VC4 and VC4-VC3 range of 0 V to 5 V. |
| 5 | VC3 | input | Cell voltage sense input with a recommended VC4-VC3 and VC3-VC2 range of 0 V to 5 V. |
| 6 | VC2 | input | Cell voltage sense input with a recommended VC3-VC2 and VC2-VC1 range of 0 V to 5 V. |
| 7 | VC1 | input | Cell voltage sense input with a recommended VC2-VC1 and VC1-VSS range of 0 V to 5 V. |
| 8 | AVSS | power_in | Analog ground. |
| 9 | SRP | input | Current sense input connected to the battery side of the sense resistor, with a recommended range of -0.2 V to 0.8 V. |
| 10 | SRN | input | Current sense input connected to the PACK- side of the sense resistor, with a recommended range of -0.2 V to 0.8 V. |
| 11 | DSG | output | Discharge FET driver output with a recommended output voltage range of 0 V to 16 V. |
| 12 | CHGU | output | CHG FET signal for the upper device of a stack, feeding the CHG signal to the CTRC pin of the lower device, with a recommended output range of 0 V to 16 V. |
| 13 | CHG | output | Charge FET driver for a single device or the bottom device of a stack, with a recommended output range of 0 V to 16 V. |
| 14 | LD | input | PACK- load removal detection input with a recommended range of 0 V to 16 V. |
| 15 | TS | input | Thermistor measurement input with a recommended range of 0 V to VTB; connect a 10-kΩ resistor to AVSS if the function is not used. |
| 16 | VTB | output | Thermistor bias output with a recommended range of 0 V to 3 V. |
| 17 | CCFG | input | Cell in series-configuration input with a recommended range of 0 V to AVDD. |
| 18 | CTRC | input | CHG and DSG override input, receiving the CHGU signal from an upper device in a stack, with a recommended range of 0 V to (VDD + 5) V. |
| 19 | CTRD | input | CHG and DSG override input with a recommended range of 0 V to (VDD + 5) V. |
| 20 | DVSS | power_in | Digital ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Power Management (PMIC) |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `BQ7790505PWR`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `bq7790505pwr-etched.step` / `bq7790505pwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bq7790505pwr.step` / `bq7790505pwr.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/bq77905) (48 pp, sha256 `f04162b24e7e7c22`, retrieved 2026-10-08, 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-5-5` (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/bq7790505pwr-datasheet.pdf)