BQ7790509PWR

@@ -0,0 +1,62 @@+# BQ7790509PWR++**Texas Instruments** · Battery Management · TSSOP-20++BQ7790509PWR from Texas Instruments, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VDD | power_in | Supply voltage input. Powers the device from the top of the cell stack it monitors. Absolute max per-cell input rating is 36 V. |+| 2 | AVDD | power_out | Analog supply regulator output. Connect only to a decoupling capacitor; do not load externally. |+| 3 | VC5 | input | Cell 5 voltage sense input. On the 4-cell BQ77904 variant this pin must be tied to pin 4 (VC4); on the BQ77905 it connects to the top of cell 5. |+| 4 | VC4 | input | Cell 4 voltage sense input. Connects to the top of cell 4 through a series input resistor. |+| 5 | VC3 | input | Cell 3 voltage sense input. Connects to the top of cell 3 through a series input resistor. |+| 6 | VC2 | input | Cell 2 voltage sense input. Connects to the top of cell 2 through a series input resistor. |+| 7 | VC1 | input | Cell 1 voltage sense input. Connects to the top of cell 1 through a series input resistor. |+| 8 | AVSS | power_in | Analog ground reference for the internal analog circuitry. |+| 9 | SRP | input | Current sense positive input. Connect to the battery side of the external sense resistor. Used to measure charge/discharge overcurrent and short-circuit conditions (thresholds in the -85 mV to +340 mV range depending on fault type). |+| 10 | SRN | input | Current sense negative input. Connect to the PACK- side of the external sense resistor. Reference for the current-sense comparators. |+| 11 | DSG | output | Discharge FET gate driver output. Drives the gate of the external low-side NMOS discharge FET. |+| 12 | CHGU | output | CHG FET signal for stacked configurations. Used on the upper device of a stack to feed its CHG signal to the CTRC pin of the device below. |+| 13 | CHG | output | Charge FET gate driver output. Used on a single device or on the bottom device of a stack to drive the external low-side NMOS charge FET. |+| 14 | LD | input | PACK- load removal detection input. Senses the PACK- node to determine when the load has been removed for fault recovery. |+| 15 | TS | input | Thermistor temperature-sense input. Connect a 103AT NTC thermistor between TS and VSS; connect a 10-kΩ bias resistor from VTB to TS. Tie a 10-kΩ resistor from TS to AVSS if temperature protection is not used. |+| 16 | VTB | output | Thermistor bias output. Provides the bias voltage for the external thermistor divider on the TS pin. |+| 17 | CCFG | input | Cell in series configuration input. Sets the number of cells the device is configured to monitor. |+| 18 | CTRC | input | CHG override input. In a stacked configuration, receives the CHGU signal from the device above to force the CHG driver state. |+| 19 | CTRD | input | DSG override input. In a stacked configuration, receives the DSG signal from the device above to force the DSG driver state. |+| 20 | DVSS | power_in | Digital ground reference for the internal digital circuitry. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-20 |+| Category | Power Management (PMIC) |+| Pins | 20 |++## Ordering variants++Same part, different packaging or reel option.++- `BQ7790509PWR`++## CAD (KiCad official)++- Symbol: `BQ7790509PWR`+- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`+- 3D model: TSSOP-20 (KiCad packages3D, STEP)++## 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 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/bq7790509pwr-datasheet.pdf)

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