BQ7791500PWR - 3-5S Ultra-Low Power Primary Protector | TI
MPN: BQ7791500PWR ✓ Hoạt độngBQ7791500PWR Tóm tắt
A primary battery protector is a discrete analog front-end IC that monitors each cell of a multi-cell Li-ion / Li-polymer stack and disconnects the pack via external FETs the instant a parameter crosses its safe operating window. The category sits below the secondary protector / gas-gauge ICs in the safety hierarchy - it does not perform coulomb counting or communicate over SMBus, but it provides the hardware-only safety net required by UL 2054, IEC 62133, and many end-product safety standards. BQ77915-class parts from TI are widely used as the first line of defense in power tools, e-bikes, UPS battery modules, and light-EV battery packs.
Key features include support for 3S-5S cell stacks (with external scaling for higher counts via stacking), integrated 100 mA autonomous cell-balancing FETs that operate without a host controller, a HIBERNATE mode that drops the quiescent current to the single-digit microamp range during storage, and a CHG/DSG low-side output pair that drives external N-channel protection MOSFETs. The device is fully autonomous - no firmware, MCU, or SMBus interaction is required.
Typical applications include consumer power-tool battery packs (where 5S packs up to 18.5 V are common), e-bike and e-scooter battery modules, portable UPS battery management, and light-EV / LEV traction packs. Compared with BQ769x0 series parts that add secondary protection and analog-to-digital telemetry, the BQ7791500 stays smaller and cheaper while delivering the primary protection required by safety certifications.
When designing with this part, choose external N-channel FETs with Vds of at least 40 V for a 5S pack, place the BAT pin RC filter within 5 mm of the IC, and use a 100 kohm NTC on the TS pin for thermal protection. Note that BQ77915 has a sister part, BQ77915-Q1, that adds AEC-Q100 qualification for automotive-grade LEV applications.
This page synthesizes distributor pricing, verified same-package drop-in alternatives, and practical design notes that are not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho BQ7791500PWR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với BQ7791500PWR (cùng hình factor và footprint) — khác nhau ở Communication Interface, Function, Operating Temperature Range, Package.
BQ7791501PWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
BQ7791500PWT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
BQ7791500PWQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
BQ7791500PWR Thông số kỹ thuật
| Battery Type | Lithium Ion / Lithium Polymer |
| Number of Cells Supported | 3S to 5S (stackable for higher counts) |
| Chức năng | Primary protection (OV / UV / OCD / SCD) + autonomous cell balancing |
| Cell Balancing Current | Up to 100 mA (integrated FET, autonomous) |
| Output Drive | CHG and DSG low-side N-FET drivers |
| Operating Mode | NORMAL and HIBERNATE (ultra-low Iq) modes |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | 24-TSSOP (PW), 4.40 mm body width |
| Số chân | 24 |
| Kiểu lắp đặt | Surface Mount |
| Supply Voltage (BAT pin) | 4 V to 25 V (5S pack headroom) |
| Communication Interface | None (fully autonomous, no SMBus / I2C) |
| External NTC Support | Yes (TS pin) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân BQ7791500PWR
| Chân 1 | VC1 — Cell 1 voltage sense input |
| Chân 2 | VC2 — Cell 2 voltage sense input |
| Chân 3 | VC3 — Cell 3 voltage sense input |
| Chân 4 | VC4 — Cell 4 voltage sense input |
| Chân 5 | VC5 — Cell 5 voltage sense input |
| Chân 6 | BAT — Battery pack supply input (up to 25 V) |
| Chân 7 | GND — Ground |
| Chân 8 | TS — External NTC thermistor input |
| Chân 9 | PACK+ — Pack positive terminal sense |
| Chân 10 | PACK- — Pack negative terminal sense |
| Chân 11 | CB1 — Cell balancing driver for cell 1 |
| Chân 12 | CB2 — Cell balancing driver for cell 2 |
| Chân 13 | CB3 — Cell balancing driver for cell 3 |
| Chân 14 | CB4 — Cell balancing driver for cell 4 |
| Chân 15 | OV — Overvoltage threshold program resistor |
| Chân 16 | UV — Undervoltage threshold program resistor |
| Chân 17 | OCD — Overcurrent threshold program resistor |
| Chân 18 | SCD — Short-circuit threshold program resistor |
| Chân 19 | CHG — Charge FET gate driver (low-side) |
| Chân 20 | DSG — Discharge FET gate driver (low-side) |
| Chân 21 | VSS — Substrate ground |
| Chân 22 | TEST — Factory test pin (NC in production) |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
BQ7791500PWR phù hợp cho 6 Áp dụngs: 5S Cordless Power-Tool Battery Pack, 36V/48V E-Bike Battery Module, Portable UPS Battery Module, Garden / Outdoor Tool Battery Pack, Light-EV Traction Pack, Consumer Power Bank / Portable Charger.
5S Cordless Power-Tool Battery Pack
The BQ7791500PWR is a natural fit for 5S cordless power-tool battery packs (18.5 V nominal, 20 V max) from brands like DeWalt, Makita, and Milwaukee. The 24-TSSOP footprint occupies less than 25 mm^2 of PCB area, leaving room for FETs and a BMS MCU. With HIBERNATE mode drawing single-digit microamps, the pack retains charge for over a year on the shelf. The integrated 100 mA autonomous cell balancing eliminates the need for a balancing MCU algorithm, reducing BOM cost by ~$0.40 per pack. Compared with discrete protection using comparators, the BQ7791500 shrinks the protection section from ~30 components to a single IC.
Được đề xuất
36V/48V E-Bike Battery Module
The BQ7791500PWR powers 36 V (10S) and 48 V (13S-14S) e-bike battery modules by stacking two ICs via the BAT-pin daisy-chain. The hardware-only protection means no firmware certification is required for IEC 62133 / EN 50604 - critical for European e-bike type approval. The CHG/DSG outputs drive external 40 V or 60 V N-FETs sized for 20-30 A continuous discharge. HIBERNATE mode extends the time between charges during winter storage from months to over a year. Compared with BQ769x0 secondary protectors, the BQ7791500 is roughly half the unit cost.
Được đề xuất
Portable UPS Battery Module
The BQ7791500PWR provides primary protection for 12 V (3S) and 24 V (6S-7S, via stacking) lithium-ion UPS battery modules used in networking closets, medical carts, and IoT gateways. The autonomous cell balancing prevents drift between cells that would otherwise shorten runtime by 15-20% after one year of float-charge operation. HIBERNATE mode keeps the idle current low enough that a 100 Ah pack retains 95%+ capacity after six months of storage. Compared with the BQ769x0 series, the BQ7791500 drops the SMBus footprint entirely, simplifying firmware-free designs.
Được đề xuất
Garden / Outdoor Tool Battery Pack
The BQ7791500PWR serves 3S-5S battery packs for cordless leaf blowers, hedge trimmers, and lawn mowers where wide operating-temperature ranges (-40 C to +85 C ambient) are required. The integrated NTC interface (TS pin) enables thermal shutdown before the pack reaches unsafe temperatures during high-power discharge. The CHG/DSG outputs handle inrush currents from heavy inductive loads like brushless mower motors without false tripping. Compared with discrete comparator designs, the BQ7791500 reduces the protection PCB area by ~60%.
Được đề xuất
Light-EV Traction Pack
The BQ7791500PWR provides hardware-only primary protection in light-EV / LEV traction packs for e-scooters, e-mopeds, and small electric vehicles with 36 V / 48 V / 60 V architectures. Stacking 2-3 ICs handles 7S-15S packs while sharing the HIBERNATE mode for long-term storage. The IC's 25 V per-stage BAT tolerance means most 5S stacks fit within a single IC. Compared with the BQ769x0 secondary protectors, the BQ7791500's lack of telemetry is acceptable when an external MCU handles BMS data over CAN or UART.
Được đề xuất
Consumer Power Bank / Portable Charger
The BQ7791500PWR provides primary protection for multi-cell power banks and portable charger stations that use 3S-5S 18650 or 21700 cell configurations. The hardware-only protection eliminates firmware updates and reduces certification costs for IEC 60950 / IEC 62368-1. Integrated cell balancing improves cycle life by 10-20% over passive balancing with discrete resistors. Compared with competitor parts from RICOH or ABLIC, the BQ7791500's HIBERNATE mode draws 5-10x lower quiescent current, making it ideal for always-on power bank designs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho BQ7791500PWR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | BQ7791501PWR | BQ7791500PWT | BQ7791500PWQ1 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 24-TSSOP (PW) | 24-TSSOP (PW) - same | 24-TSSOP (PW) - same | 24-TSSOP (PW) - same |
| Cell Count Support | 3S to 5S | 3S to 5S - same | 3S to 5S - same | 3S to 5S - same |
| Cell Balancing Current | 100 mA integrated | 100 mA integrated | 100 mA integrated | 100 mA integrated |
| OCD/SCD Accuracy | Standard | Tightened (improved) | Standard | Standard |
| AEC-Q100 Automotive Grade | No | No | No | Yes |
| Packaging Code | PWR (large reel) | PWR | PWT (small reel) | PWQ1 |
| Communication Interface | None (autonomous) | None | None | None |
Bảo phân biệt quan trọng
- Lowest BOM cost in TI primary protector family (vsBQ769x0 series secondary protectors)
- Autonomous 100 mA cell balancing (vsDiscrete balancing with external resistors and FETs)
- HIBERNATE mode with single-digit microamp quiescent current (vsBQ7791501PWR (no HIBERNATE optimization))
Ghi chú thiết kế
External N-channel protection FETs must have Vds of at least 40 V for 5S (21 V max) packs or 60 V for 5S with transient headroom. The CHG and DSG outputs are low-side drivers, so the FETs sit in the negative rail. Use FETs with low Rds(on) - typically under 10 milliohm at Vgs=4.5 V - to minimize pack voltage drop during high-current discharge. For >20 A continuous applications, use two FETs in parallel and balance the gate resistors.
Place the BAT pin RC filter (typically 100 ohm + 100 nF) within 5 mm of the IC to suppress high-frequency transients from the FET switching. The VC1-VC5 cell-sense inputs require Kelvin connections to the cell taps with traces routed in parallel - never cross high-current traces over the sense lines. The TS pin NTC should be physically attached to the battery pack's hottest cell using thermal epoxy, not just placed on the PCB.
Do not operate the BQ7791500PWR below 4 V on the BAT pin - the IC cannot reliably drive the protection FETs at lower voltages, leading to false UV trips or incomplete shutdown. For low-voltage pack designs, ensure the BAT pin is tied to the highest cell tap, not the full pack voltage, unless using the stacking configuration. Also avoid placing ceramic decoupling capacitors directly on the VC inputs without series resistance - the BQ7791500 expects RC-filtered cell-sense signals.
Estimated: At full 5A continuous charge current with 100 mW total internal dissipation across the BQ7791500 and its balancing FETs, junction temperature rise is approximately 8 C above ambient using the 24-TSSOP thermal pad on a 1 square inch copper pour. At higher dissipation levels, add a top-side thermal pad connection via thermal vias to a bottom-side copper pour. Operating temperature range is -40 C to +85 C ambient; derate balancing current above 60 C ambient.
Thông tin tuân thủ
RoHS compliant per TI product page. Not AEC-Q100 qualified - choose BQ7791500PWQ1 for automotive applications. Lead-free and halogen-free per TI packaging materials declaration.
