My Inquiry
My Account
Texas Instruments BQ771806DPJT
- Part No.:
- BQ771806DPJT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771806DPJT.pdf
- Description:
- IC BATT PROT LI-ION 2-5CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:725
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ771806DPJT from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.350 V fixed overvoltage threshold, 3 s internal delay timer, and CMOS active-high output drive. It operates across –40°C to 110°C and supports handheld power tools requiring precise cell-level voltage monitoring and fault signaling.
For engineers reviewing the BQ771806DPJT datasheet, BQ771806DPJT pinout, BQ771806DPJT application, or BQ771806DPJT equivalent, key selection criteria include OVP threshold tolerance, delay timing consistency, low quiescent current (≈1 µA), leakage per cell input (<100 nA), and functional safety documentation support for battery management system certification.
Technical Context
The BQ771806DPJT independently monitors up to five differential cell voltages (V1–VSS through V5–V4) using precision internal references. Its overvoltage detection logic triggers a fixed 3 s delay timer upon any cell exceeding 4.350 V, after which the CMOS-active-high OUT pin drives high to signal fault condition.
It supports Customer Test Mode (CTM) with <15 ms fault detection delay for production-line validation, requires external RC filters on all Vx inputs for noise immunity, and draws only ≈1 µA supply current when all cells remain below VOV - enabling ultra-low-power battery pack protection without compromising response fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.350 V ±10 mV at 25°C - ensures reliable trip point for high-voltage Li-ion cells without calibration overhead |
| OVP Hysteresis | 300 mV nominal - prevents chatter during recovery near threshold and enables stable re-entry into normal mode |
| Delay Timer | 3 s nominal - provides sufficient time for transient overvoltage rejection while ensuring timely fault response |
| Supply Current | ≈1 µA (VCELL(ALL) < VPROTECT) - minimizes parasitic drain on battery pack during standby |
| Input Leakage | <100 nA per cell input - preserves cell voltage integrity and avoids measurement error in high-impedance sensing networks |
| Operating Temp | –40°C to 110°C - supports operation in power tool and e-bike environments with wide thermal excursions |
| Output Type | CMOS active-high - simplifies interface to microcontroller GPIO or latch circuit without external pull-up |
Pinout & Package
Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, wettable flank, RoHS-compliant, MSL Level-1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Unregulated 3–25 V supply; requires series resistor + bypass capacitor for noise filtering and current limiting |
| V5 | Sense input | Differential voltage sense for topmost cell (V5–V4); connects to positive terminal of Cell 5 in 5-series stack |
| V4 | Sense input | Differential voltage sense for Cell 4 (V4–V3); placed between Cell 4 and Cell 3 in stacked configuration |
| V3 | Sense input | Differential voltage sense for Cell 3 (V3–V2); used in 3-, 4-, and 5-series configurations |
| V2 | Sense input | Differential voltage sense for Cell 2 (V2–V1); required for all configurations ≥2-series |
| V1 | Sense input | Differential voltage sense for lowest cell (V1–VSS); connects directly to positive terminal of Cell 1 |
| VSS | Ground reference | IC ground and electrically tied to negative terminal of lowest cell - forms common reference for all Vx inputs |
| OUT | Fault signal output | CMOS active-high output; drives high after 3 s delay when any cell exceeds 4.350 V - directly interfaces to host controller interrupt or latch |
Key Features
| Feature | Design Value |
|---|---|
| Independent multi-cell monitoring | Simultaneous sensing of up to five differential cell voltages (V1–VSS to V5–V4) enables accurate per-cell OVP in stacked Li-ion configurations |
| Fixed 3 s delay timer | Internally generated, temperature-stable delay eliminates need for external timing components and reduces BOM count |
| Functional safety support | Documentation available to aid ISO 26262 or IEC 61508 system-level safety analysis - critical for certified battery packs |
| Customer Test Mode (CTM) | Reduces fault detection delay to <15 ms for rapid production-line verification without modifying hardware or firmware |
| Ultra-low leakage input | <100 nA per Vx pin preserves cell voltage balance and avoids measurement drift in high-resistance sensing networks |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
Use Scenario: High-current discharge cycles cause voltage spikes during motor startup and brush commutation in 18–24 V battery packs. IC Role / Device Role / Timing Role: Monitors each cell in 5-series Li-ion stack; asserts active-high OUT after 3 s if any cell exceeds 4.350 V to disable charging or trigger shutdown. Use Value: Prevents cell overcharge during regenerative braking or fast-charging anomalies while maintaining >99.9% uptime via precise ±10 mV threshold accuracy. |
Use Scenario: Repeated deep discharge and fast recharge cycles in compact 3-series packs increase risk of individual cell overvoltage during termination. IC Role / Device Role / Timing Role: Senses V1–VSS, V2–V1, and V3–V2 differentially; initiates fixed 3 s delay before asserting CMOS-high OUT to isolate pack from charger. Use Value: Enables safe 3 A+ charge rates by rejecting sub-100 ms transients while responding reliably to sustained overvoltage events. |
| eBike Battery Packs | UPS Battery Backup Systems |
Use Scenario: Regenerative braking in mid-drive eBikes induces reverse current and voltage overshoot on upper cells in 4-series 14.8 V packs. IC Role / Device Role / Timing Role: Detects overvoltage on V4–V3 or V3–V2; uses internal 3 s timer to avoid nuisance trips during brief braking spikes, then signals fault via OUT. Use Value: Extends cycle life by preventing electrolyte decomposition at >4.35 V while supporting field-replaceable modular pack architecture. |
Use Scenario: Grid fluctuations and generator switchover cause momentary overvoltage on backup Li-ion strings in telecom UPS units. IC Role / Device Role / Timing Role: Provides independent OVP for each cell in 2-series configuration (V1–VSS, V2–V1); asserts OUT after 3 s to initiate controlled shutdown sequence. Use Value: Ensures fail-safe operation under IEEE 1626 compliance by delivering deterministic 3 s response with no software dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771800DPJT | 4.300 V OVP threshold, same 300 mV hysteresis and 4 s delay | Designed for standard 4.2 V/cell Li-ion systems; less margin for high-voltage chemistries like LiNiMnCoO₂ | Select when targeting nominal 4.30 V trip with longer 4 s delay for enhanced transient immunity |
| BQ771807DPJT | 4.450 V OVP threshold, identical 300 mV hysteresis and 3 s delay | Optimized for high-voltage Li-ion variants (e.g., LiCoO₂ with extended range); higher trip point increases usable capacity | Choose for 4.45 V-rated cells where maximizing energy density outweighs reduced safety margin |
Compared with BQ771806DPJT, BQ771800DPJT offers tighter trip alignment with legacy 4.3 V systems but slower response, while BQ771807DPJT enables higher pack voltage utilization at the cost of reduced overvoltage headroom - making BQ771806DPJT the balanced choice for 4.35 V nominal designs requiring both safety margin and capacity efficiency.
Availability
BQ771806DPJT is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, and e-bike battery packs requiring stable component supply, long-term lifecycle support, and functional safety documentation.
Supply support for BQ771806DPJT 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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in battery management solutions.
The BQ7718 family is designed specifically for standalone overvoltage protection in multi-cell Li-ion battery packs, emphasizing precision, ultra-low power, and functional safety readiness for industrial and consumer portable equipment.
FAQ
What is the overvoltage protection threshold of the BQ771806DPJT?
The BQ771806DPJT has a fixed overvoltage protection threshold of 4.350 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and remains stable across temperature (±44 mV max drift from –40°C to 110°C), making it suitable for high-precision Li-ion battery protection where consistent trip points are critical for safety and longevity. The BQ771806DPJT does not support user-adjustable thresholds.
Does the BQ771806DPJT support 2-series, 3-series, 4-series, and 5-series battery configurations?
Yes, the BQ771806DPJT supports 2- to 5-series Li-ion battery stacks by monitoring differential voltages V1–VSS through V5–V4. Unused Vx pins (e.g., V4 and V5 in a 2-series setup) must be connected to VSS per TI design guidelines to ensure proper biasing and avoid floating inputs. The BQ771806DPJT maintains full OVP functionality regardless of stack size within this range.
What is the function of the OUT pin on the BQ771806DPJT?
The OUT pin on the BQ771806DPJT is a CMOS active-high output that drives high after the internal 3 s delay timer expires when any monitored cell exceeds 4.350 V. It requires no external pull-up and can directly interface with microcontroller interrupt inputs or latch circuits. The BQ771806DPJT's OUT pin remains low during normal operation and transitions cleanly to VDD level during fault conditions.
How does the Customer Test Mode (CTM) work on the BQ771806DPJT?
Customer Test Mode (CTM) on the BQ771806DPJT reduces the overvoltage fault detection delay from 3 s to less than 15 ms by applying VDD ≥10 V higher than V5. This enables rapid production-line validation of OVP functionality without modifying PCB layout or firmware. CTM exits automatically when the VDD-to-V5 differential drops below 10 V. The BQ771806DPJT implements hardware-based CTM with no register access required.
Is the BQ771806DPJT compatible with functional safety standards such as ISO 26262 or IEC 61508?
Yes, the BQ771806DPJT is functional safety-capable: Texas Instruments provides documentation including FIT rate data, failure mode analysis, and diagnostic coverage guidance to support system-level compliance with ISO 26262 ASIL-B and IEC 61508 SIL-2. While the BQ771806DPJT itself is not certified, its design and supporting materials enable integration into safety-critical battery management systems - a key requirement for the BQ771806DPJT in automotive and industrial applications.
BQ771806DPJT 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)
BQ771806DPJT FAQ
1.How can I place an order for BQ771806DPJT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771806DPJT 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 BQ771806DPJT reliable?
The price and inventory of BQ771806DPJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771806DPJT is usually 5 days.
3.What payment methods are accepted for BQ771806DPJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ771806DPJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ771806DPJT?
BQ771806DPJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ771806DPJT 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 BQ771806DPJT?
For technical support, including BQ771806DPJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771806DPJT requirements.
6.How does Aetrix verify that BQ771806DPJT is sourced from the original manufacturer or authorized distributors?
All BQ771806DPJT 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 BQ771806DPJT meets industry standards.
7.What is the process for return or replacement of BQ771806DPJT?
All BQ771806DPJT units undergo pre-shipment inspection (PSI). If there is an issue with BQ771806DPJT, 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 BQ771806DPJT part is unused and in its original packaging.
Return procedure for BQ771806DPJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ771806DPJT Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
