BQ7790509PWR

BQ7790509PWR is a TI battery protection IC (from the bq7790x family) in a PowerPAD package. It is designed for Li‑ion/Li‑polymer multi‑cell packs and works with external MOSFETs to disconnect the pack when unsafe conditions are detected.
Key points:
- Monitors multiple cell voltages (via VC pins), pack current, and temperature.
- Protections include overvoltage, undervoltage, overcurrent/short‑circuit, and over/under temperature.
- Provides fault/status outputs to a host controller and controls external MOSFETs to isolate the pack.
- Does not perform active cell balancing.
- Requires external MOSFETs and a sense resistor; suitable for packs in tools, power devices, and similar applications.
For exact cell count, threshold values, pinout, and a recommended schematic, refer to the TI datasheet for bq7790509PWR.

TI does not publish a direct cross-reference for BQ7790509PWR. The closest TI substitutes are other devices in the BQ7790x BMS protection family or the BQ769x0 multi‑cell monitor/protector family, depending on your cell count and features. For an exact substitute, use TI’s cross-reference tool or contact TI support. Be ready to specify pack size (e.g., 4–10S), required protections, balancing, packaging, and temperature range.

Here are the typical features for bq7790509PWR (TI battery protection IC for Li‑ion packs, 9S family):
- Protects up to 9-series Li‑ion cells (9S packs)
- Overcharge protection with auto-retry
- Overdischarge protection with auto-recovery
- Overcurrent/short‑circuit protection with fast response
- Overtemperature protection
- Fault latch and diagnostic/status outputs for the host
- Drives external MOSFETs to disconnect the pack when needed
- Low quiescent current in normal/standby operation
- Wide operating temperature range (industrial-grade)
- RoHS compliant; available in standard power/package options (e.g., QFN/WSON)
Note: exact features may vary by package variant; consult the official TI datasheet for precise specifications and pinout.

BQ7790509PWR is a TI bq7790x family multi‑cell Li‑ion battery protection IC. Function: monitors individual cell voltages and pack current, provides overvoltage/undervoltage and overcurrent/short‑circuit protection, and drives external protection FETs (with optional temperature sensing). Pin count depends on the specific package (PowerPAD variants use a high‑pin-count package). For the exact pin count, refer to the datasheet for the exact package variant you’re using.

- Manufacturer: Texas Instruments (TI).
- What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog, mixed-signal, and embedded processing integrated circuits, serving a wide range of industries worldwide.

BQ7790509PWR is a protection IC for up to 9-series Li‑ion/Li‑poly battery packs (pack‑level protection with integrated MOSFETs).
Common applications:
- Cordless tools
- E‑bikes/e‑scooters and other mobility devices
- Home/industrial energy-storage systems
- Solar backup/power packs
- Robotics and portable power modules requiring high‑cell protection
This covers high‑cell‑count pack protection in various consumer, industrial, and renewable‑energy applications.

PowerPAD-style package (QFN/SON with an exposed thermal pad). The PWR suffix indicates TI’s PowerPAD package.