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Texas Instruments BQ771823DPJR
- Part No.:
- BQ771823DPJR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
BQ771823DPJR.pdf
- Description:
- IC BATT PROT LI-ION 2-5CEL 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,920
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Product details
Overview
BQ771823DPJR from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.275 V fixed overvoltage threshold, 3 s internal delay timer, and N-channel open-drain active-low output. 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 BQ771823DPJR datasheet, BQ771823DPJR pinout, BQ771823DPJR application, or BQ771823DPJR equivalent, this page delivers verified technical context, package mapping, functional timing behavior, real-world implementation constraints, and validated alternative options for battery pack safety circuit design.
Technical Context
The BQ771823DPJR independently monitors up to five differential cell voltages (V1–VSS through V5–V4) using internal precision comparators referenced to a 4.275 V OVP threshold with 300 mV hysteresis. Upon detection of any cell exceeding VOV, it initiates a fixed 3 s delay timer before asserting the active-low open-drain OUT signal.
It operates from a 3 V to 25 V unregulated VDD supply, draws only ~1 µA quiescent current when all cells are below VOV, and maintains <100 nA leakage per sense input-enabling long-term battery pack standby integrity without significant self-discharge impact.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.275 V ±10 mV at 25°C - enables precise cell overvoltage cutoff for 3.6 V nominal Li-ion stacks |
| OVP Hysteresis | 300 mV - prevents chatter during recovery near trip point; ensures stable re-entry into normal mode |
| Delay Timer | 3 s nominal - provides deterministic fault response window for system-level shutdown sequencing |
| Output Type | N-channel open-drain, active-low - requires external pull-up; interfaces directly with MOSFET gate drivers or microcontroller interrupt inputs |
| Quiescent Current | ≈1 µA (VCELL(ALL) < VPROTECT) - minimizes parasitic drain on idle battery packs |
| Sense Input Leakage | <100 nA per cell input - preserves voltage divider accuracy and avoids measurement error in high-impedance sensing networks |
| Operating Temp | –40°C to 110°C - supports industrial-grade battery applications including e-bikes and cordless power tools |
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 inrush limiting |
| V5 | Sense input | Differential voltage input for top cell (V5–V4); connects to positive terminal of fifth cell in stack |
| V4 | Sense input | Differential voltage input for fourth cell (V4–V3); connects to positive terminal of fourth cell |
| V3 | Sense input | Differential voltage input for third cell (V3–V2); connects to positive terminal of third cell |
| V2 | Sense input | Differential voltage input for second cell (V2–V1); connects to positive terminal of second cell |
| V1 | Sense input | Differential voltage input for lowest cell (V1–VSS); connects to positive terminal of first cell |
| VSS | Ground reference | IC ground and electrically tied to negative terminal of lowest cell - forms common reference for all sense inputs |
| OUT | Fault output | N-channel open-drain, active-low; sinks current when OVP detected; requires external pull-up to PACK+ or logic rail |
Key Features
| Feature | Design Value |
|---|---|
| Independent multi-cell monitoring | Simultaneously checks five differential cell voltages without shared reference drift or cross-coupling errors |
| Fixed 3 s OVP delay | Eliminates external timing components; ensures repeatable response time for safety-critical shutdown sequences |
| Functional Safety-Capable support | Documentation available to aid ISO 26262 or IEC 61508 system-level safety analysis and FMEDA reporting |
| Low-power operation | 1 µA ICC and <100 nA per sense input enable >10-year shelf life in battery management systems with periodic wake-up |
| Customer Test Mode (CTM) | Reduces OVP delay to ~15 ms for production-line functional testing - avoids full 3 s wait during manufacturing verification |
Applications
| Handheld Power Tools | Cordless Vacuum Cleaners |
|---|---|
Use Scenario: 4-series Li-ion battery pack in brushless drill/driver subjected to regenerative braking and fast charging transients. IC Role / Device Role / Timing Role: Monitors each cell independently; triggers 3 s delayed open-drain fault signal to disable charge FETs and isolate pack upon first cell reaching 4.275 V. Use Value: Prevents thermal runaway by enforcing strict per-cell voltage limit with deterministic timing-no software dependency or MCU intervention required. |
Use Scenario: 3-series battery in high-current vacuum motor system where cell imbalance may occur due to varying discharge rates across parallel modules. IC Role / Device Role / Timing Role: Detects overvoltage on any individual cell and asserts active-low OUT after 3 s to activate external protection switch or alert host controller. Use Value: Enables reliable hardware-based cutoff independent of firmware state-critical for consumer appliances lacking redundant safety layers. |
| eBike Battery Packs | UPS Battery Backup Systems |
Use Scenario: 5-series Li-ion pack in pedal-assist eBike exposed to wide ambient temperature range (–20°C to 60°C) and vibration-induced contact resistance shifts. IC Role / Device Role / Timing Role: Provides ±10 mV OVP accuracy at 25°C and maintains ≤54 mV total drift across –40°C to 110°C; drives fault signal via open-drain OUT to main BMS controller. Use Value: Ensures consistent overvoltage protection performance across environmental extremes-reducing false trips and field failures. |
Use Scenario: 2-series backup battery in telecom or network infrastructure UPS where low quiescent current is essential for multi-year standby life. IC Role / Device Role / Timing Role: Continuously monitors two cells with <100 nA per-input leakage and ≈1 µA total ICC; asserts fault only after confirmed 3 s overvoltage condition. Use Value: Extends maintenance-free operational lifetime by minimizing parasitic drain while maintaining fail-safe hardware protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ771801DPJR | Same 4.275 V OVP threshold and 3 s delay, but 50 mV hysteresis vs. 300 mV | Lower hysteresis increases risk of oscillation near trip point in noisy environments or with marginal cell balance | Select BQ771801DPJR only if tighter hysteresis is required for rapid recovery; otherwise BQ771823DPJR's 300 mV improves stability |
| BQ771818DPJR | 4.300 V OVP threshold, same 300 mV hysteresis and 3 s delay, CMOS active-high output | Active-high output eliminates need for external pull-up but requires compatible downstream logic interface | Choose BQ771818DPJR when interfacing with controllers expecting high-active fault signals; BQ771823DPJR suits open-drain bus architectures |
Compared with BQ771801DPJR and BQ771818DPJR, the BQ771823DPJR offers optimal trade-off between hysteresis stability and output compatibility for industrial-grade battery packs requiring robust, no-software safety enforcement.
Availability
BQ771823DPJR is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, and light electric vehicle battery packs requiring stable component supply, long-lifecycle support, and automotive-grade reliability under extended temperature operation.
Supply support for BQ771823DPJR 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, with leadership in battery management, power conversion, and functional safety technologies.
The BQ7718 family is designed specifically for hardware-based overvoltage protection in multi-cell Li-ion battery packs-targeting applications where firmware-independent, deterministic safety response is mandatory.
FAQ
What is the exact overvoltage protection threshold and accuracy of the BQ771823DPJR?
The BQ771823DPJR has a fixed overvoltage protection (OVP) threshold of 4.275 V with ±10 mV accuracy at 25°C. Its total accuracy drift remains within ±54 mV across the full operating temperature range of –40°C to 110°C, ensuring reliable cell-level protection without calibration or trimming.
Does the BQ771823DPJR require external timing components for its overvoltage delay?
No, the BQ771823DPJR integrates a fixed 3 s internal delay timer. Unlike adjustable-delay variants, it requires no external capacitor or resistor for timing-reducing bill-of-materials count, PCB area, and potential tolerance-related timing variation in production.
How does the BQ771823DPJR interface with external protection circuitry?
The BQ771823DPJR features an N-channel open-drain, active-low OUT pin. It must be pulled up externally-typically to PACK+ or a logic rail-to generate a valid fault signal. When triggered, OUT sinks current to VSS, enabling direct drive of MOSFET gates or microcontroller interrupt pins without level-shifting.
Can the BQ771823DPJR monitor fewer than five cells?
Yes, the BQ771823DPJR supports 2-, 3-, 4-, and 5-series configurations. Unused sense inputs (e.g., V5 and V4 in a 3-cell pack) are left unconnected or tied to appropriate bias points per TI layout guidelines; the device automatically adapts monitoring scope without configuration pins or firmware.
Is the BQ771823DPJR suitable for functional safety–compliant designs?
Yes, the BQ771823DPJR is labeled Functional Safety-Capable. Texas Instruments provides documentation-including failure mode analysis and diagnostic coverage data-to support ISO 26262 ASIL-B or IEC 61508 SIL-2 system-level safety certification efforts for battery management systems.
BQ771823DPJR 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)
BQ771823DPJR FAQ
1.How can I place an order for BQ771823DPJR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ771823DPJR 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 BQ771823DPJR reliable?
The price and inventory of BQ771823DPJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ771823DPJR is usually 5 days.
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Once your BQ771823DPJR 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 BQ771823DPJR?
For technical support, including BQ771823DPJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ771823DPJR requirements.
6.How does Aetrix verify that BQ771823DPJR is sourced from the original manufacturer or authorized distributors?
All BQ771823DPJR 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 BQ771823DPJR meets industry standards.
7.What is the process for return or replacement of BQ771823DPJR?
All BQ771823DPJR units undergo pre-shipment inspection (PSI). If there is an issue with BQ771823DPJR, 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 BQ771823DPJR part is unused and in its original packaging.
Return procedure for BQ771823DPJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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