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Texas Instruments BQ771802DPJT
- Part No.:
- BQ771802DPJT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771802DPJT.pdf
- Description:
- IC BATT PROT LI-ION 2-5CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:832
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Product details
Overview
BQ771802DPJT from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 1 s internal delay timer, and NCH open-drain active-low output. It monitors each cell independently and supports handheld power tools and cordless vacuum cleaners.
For engineers reviewing the BQ771802DPJT datasheet, BQ771802DPJT pinout, BQ771802DPJT application, or BQ771802DPJT equivalent, key selection criteria include fixed 4.225 V overvoltage threshold, 0.3 V hysteresis, sub-1 µA quiescent current, and QFN-8 (3.0 mm × 4.0 mm) package compatibility with high-accuracy cell voltage sensing.
Technical Context
The BQ771802DPJT implements independent per-cell voltage monitoring using precision analog comparators referenced to an internal bandgap. Upon detection of any cell exceeding 4.225 V, a digitally controlled 1 s delay timer initiates before asserting the NCH open-drain OUT pin low.
It operates across –40°C to 110°C with supply voltage from 3 V to 25 V, draws only 1 µA supply current when all cells are below threshold, and maintains <100 nA leakage per sense input - enabling long-term battery pack standby integrity without parasitic drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.225 V ±10 mV at 25°C - ensures precise cell-level overvoltage cutoff within tight Li-ion voltage window |
| OV Hysteresis | 300 mV - prevents chatter during voltage decay near trip point, enabling stable fault recovery |
| Delay Timer | 1 s nominal - provides deterministic response window for system-level fault handling and isolation |
| Supply Current | ≈1 µA (all cells < VPROTECT) - minimizes self-discharge in battery packs during storage or idle |
| Sense Input Leakage | <100 nA per Vx pin - preserves cell voltage balance and avoids measurement error from shunt paths |
| Output Type | NCH open-drain active-low - allows flexible external pull-up to PACK+ or system rail for fault signaling |
| Operating Temp | –40°C to 110°C - supports operation in power tools and e-bike battery packs under thermal stress |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, wettable flank, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–25 V supply; requires RC filter (RVD/CVD) for noise immunity and ESD protection |
| V5 | Cell 5 positive sense input | Monitors top cell voltage in 5-series stack; high-impedance input with <100 nA leakage |
| V4 | Cell 4 positive sense input | Monitors fourth cell from bottom; shares same accuracy and leakage specs as V5 |
| V3 | Cell 3 positive sense input | Supports 3-, 4-, or 5-series configurations; requires external RC filter (RIN/CIN) per input |
| V2 | Cell 2 positive sense input | Enables 2-series operation (e.g., e-scooter main pack); calibrated for 1 kΩ RIN filter resistor |
| V1 | Cell 1 positive sense input | Connects to lowest cell's positive terminal; referenced to VSS (stack negative) |
| VSS | Ground reference | Electrically tied to battery pack negative; serves as common return for all sense inputs and IC ground |
| OUT | Fault signal output | NCH open-drain active-low - sinks current when OV detected; requires external pull-up for logic-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-cell monitoring | Five dedicated sense inputs (V1–V5) enable accurate differential voltage tracking across stacked cells without shared reference errors |
| Customer Test Mode (CTM) | Reduces OV delay to ~15 ms during production testing - accelerates functional verification without modifying hardware |
| Functional Safety-Capable | Documentation available to support ISO 26262 or IEC 61508 system-level safety analysis for automotive and industrial battery systems |
| Low-power architecture | 1 µA ICC and <100 nA per-input leakage preserve battery state-of-charge during long-term storage or standby |
| Fixed OVP with tight tolerance | 4.225 V ±10 mV threshold eliminates need for external calibration or trimming components in cost-sensitive applications |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
|
Use Scenario: High-current discharge cycles with rapid recharge cause cell voltage overshoot during charging termination or regenerative braking. IC Role / Device Role / Timing Role: BQ771802DPJT continuously monitors each 18650/LiPo cell in a 4-series pack and triggers fault signal within 1 s if any exceeds 4.225 V. Use Value: Prevents electrolyte decomposition and thermal runaway by enforcing strict per-cell voltage ceiling before damage occurs. |
Use Scenario: Multi-cell battery packs experience uneven aging and voltage drift across cells during repeated charge/discharge cycles. IC Role / Device Role / Timing Role: BQ771802DPJT detects overvoltage on individual cells (e.g., V3–V2) and asserts open-drain OUT to disable charging FETs via external logic. Use Value: Enables cell-level protection without requiring full-pack shutdown - improves runtime and service life in consumer appliances. |
| eBike Battery Packs | UPS Battery Backup Systems |
|
Use Scenario: Pedal-assist eBikes draw burst currents up to 30 A, inducing transient voltage spikes across series-connected cells. IC Role / Device Role / Timing Role: BQ771802DPJT uses its 1 s delay and 300 mV hysteresis to distinguish between benign transients and sustained overvoltage faults. Use Value: Avoids nuisance trips while ensuring reliable protection during sustained overcharge events caused by charger failure. |
Use Scenario: Datacenter UPS systems require fail-safe battery management during grid outages and automatic recharging phases. IC Role / Device Role / Timing Role: BQ771802DPJT integrates into secondary protection layer alongside primary BMS, providing redundant OVP for 2- or 3-series lead-acid or LiFePO₄ backup cells. Use Value: Adds hardware-enforced voltage ceiling independent of microcontroller firmware - critical for safety-critical backup power continuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771801DPJT | 4.275 V OVP threshold, 50 mV hysteresis, same 1 s delay and NCH open-drain output | Better suited for higher-voltage Li-ion chemistries (e.g., NMC with wider safe operating range) | Select when tighter hysteresis (0–100 mV) is required to minimize voltage undershoot after fault clearance |
| BQ771803DPJT | Identical 4.275 V OVP and 50 mV hysteresis but shares same 1 s delay and output type as BQ771802DPJT | Targeted at applications needing identical timing and drive but slightly higher trip point than BQ771802DPJT | Choose for drop-in replacement where 4.275 V threshold aligns better with charger termination voltage and cell specification |
Compared with BQ771801DPJT and BQ771803DPJT, the BQ771802DPJT offers the lowest OVP threshold (4.225 V) in the family with 300 mV hysteresis - making it optimal for conservative protection of sensitive Li-ion cells prone to overcharge degradation.
Availability
BQ771802DPJT is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, and e-bike battery packs requiring stable component supply, long-lifecycle support, and automotive-grade temperature performance.
Supply support for BQ771802DPJT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ7718 family is designed specifically for standalone, high-accuracy overvoltage protection in multi-cell Li-ion battery packs - emphasizing ultra-low power, pin-compatible variants, and functional safety documentation support.
FAQ
What is the overvoltage protection threshold of the BQ771802DPJT?
The BQ771802DPJT has a fixed overvoltage protection threshold of 4.225 V ±10 mV at 25°C, with accuracy degrading to ±54 mV at 110°C. This value is factory-trimmed and does not require external configuration - ensuring consistent cell-level protection across production units without calibration.
Does the BQ771802DPJT support 2-series battery configurations?
Yes, the BQ771802DPJT supports 2- to 5-series Li-ion configurations. For 2-series use, only V1, V2, and VSS pins are connected; V3–V5 are left unconnected or tied to appropriate potentials per TI layout guidelines. The device automatically adapts sensing to the number of active cells.
What is the function of the OUT pin on the BQ771802DPJT?
The OUT pin on the BQ771802DPJT is an NCH open-drain active-low output. During overvoltage, it sinks current to VSS; otherwise, it presents high impedance. An external pull-up resistor (typically 10–100 kΩ to PACK+) is required to generate a logic-high signal when no fault is present.
How does the Customer Test Mode (CTM) work on the BQ771802DPJT?
Customer Test Mode reduces the overvoltage delay from 1 s to ~15 ms by applying VDD ≥10 V above V5. This enables rapid functional validation during battery pack manufacturing without altering circuit layout. CTM exits automatically when the VDD–V5 differential drops below 10 V.
Is the BQ771802DPJT compatible with leaded MSOP packages?
No - the BQ771802DPJT is specified only for the DPJ (WSON-8) package: 3.00 mm × 4.00 mm, no leads. The DGK (MSOP-8) variant exists for other members of the BQ7718xy family (e.g., BQ771800DGKT), but BQ771802 is not offered in DGK per TI's orderable addendum.
BQ771802DPJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Protection
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2 ~ 5
- Fault Protection:
- Over Voltage
- Interface:
- -
- Operating Temperature:
- -40°C ~ 110°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (3x4)
BQ771802DPJT FAQ
1.How can I place an order for BQ771802DPJT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771802DPJT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ771802DPJT reliable?
The price and inventory of BQ771802DPJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771802DPJT is usually 5 days.
3.What payment methods are accepted for BQ771802DPJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ771802DPJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ771802DPJT?
BQ771802DPJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ771802DPJT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ771802DPJT?
For technical support, including BQ771802DPJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771802DPJT requirements.
6.How does Aetrix verify that BQ771802DPJT is sourced from the original manufacturer or authorized distributors?
All BQ771802DPJT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ771802DPJT meets industry standards.
7.What is the process for return or replacement of BQ771802DPJT?
All BQ771802DPJT units undergo pre-shipment inspection (PSI). If there is an issue with BQ771802DPJT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ771802DPJT part is unused and in its original packaging.
Return procedure for BQ771802DPJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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