Texas Instruments BQ771817DPJR

Overview

BQ771817DPJR 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, 1 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 BQ771817DPJR datasheet, BQ771817DPJR pinout, BQ771817DPJR application, or BQ771817DPJR equivalent, key selection criteria include OVP threshold tolerance, delay timing consistency, leakage current per cell input (<100 nA), low ICC (≈1 µA), and functional safety documentation support for battery pack system design.

Technical Context

The BQ771817DPJR independently monitors up to five differential cell voltages (V1–VSS through V5–V4) using precision internal references. Upon detection of any cell exceeding 4.275 V, it initiates a fixed 1 s delay timer before asserting the CMOS active-high OUT signal.

It integrates no external timing components-delay is fully internal-and supports Customer Test Mode (CTM) with sub-15 ms fault detection for production-line validation. The device requires RC filtering on all Vx inputs and uses VDD as its unregulated supply, rated from 3 V to 25 V.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, wettable flank, RoHS-compliant, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage protection applications.

Compared with BQ771817DPJR, BQ771801DPJR offers longer delay and active-low signaling for legacy interface compatibility, while BQ771818DPJR raises the OVP threshold by 25 mV with identical timing and drive-enabling drop-in use where higher trip voltage improves robustness against measurement drift.

Availability

BQ771817DPJR is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, and light electric vehicle battery packs requiring stable component supply, automotive-grade temperature operation, and functional safety documentation support.

Supply support for BQ771817DPJR 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 ICs and functional safety infrastructure.

The BQ7718 family is designed specifically for standalone overvoltage protection in multi-cell Li-ion battery packs-prioritizing accuracy, ultra-low power, and production-test efficiency without MCU dependency.

FAQ

What is the overvoltage protection threshold of the BQ771817DPJR?

The BQ771817DPJR has a fixed overvoltage protection threshold of 4.275 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and remains stable across temperature, supporting reliable cell-level protection without external calibration. The BQ771817DPJR maintains this specification across its full operating range of –40°C to 110°C, with worst-case drift bounded to ±54 mV at 110°C.

Does the BQ771817DPJR require external timing components?

No, the BQ771817DPJR uses an internal fixed 1 s delay timer-no external capacitor or resistor is needed for timing. This simplifies PCB layout, reduces BOM cost, and eliminates timing variation due to component tolerances or temperature drift. The BQ771817DPJR does require external RC filters on each Vx input (RIN ≈ 1 kΩ, CIN = 0.01–0.1 µF) for noise suppression, as specified in TI's application guidance.

How does the BQ771817DPJR handle multiple cell configurations?

The BQ771817DPJR supports 2-, 3-, 4-, and 5-series Li-ion configurations by monitoring differential voltages across V1–VSS, V2–V1, V3–V2, V4–V3, and V5–V4. Unused sense inputs (e.g., V5 and V4 in a 2-cell pack) must be tied to appropriate potentials per TI's guidelines to avoid floating nodes. The BQ771817DPJR performs independent OVP checks on all enabled inputs and triggers OUT if any one exceeds 4.275 V.

What is the purpose of Customer Test Mode (CTM) in the BQ771817DPJR?

Customer Test Mode (CTM) in the BQ771817DPJR reduces the overvoltage delay from 1 s to less than 15 ms for accelerated production-line testing. It is activated by applying VDD at least 10 V higher than V5, allowing rapid validation of fault response without waiting for full delay timing. The BQ771817DPJR exits CTM automatically when the VDD-to-V5 differential drops below 10 V, ensuring safe transition back to normal operation.

Is the BQ771817DPJR compatible with functional safety standards?

Yes, the BQ771817DPJR is functional safety-capable: Texas Instruments provides documentation-including failure mode analysis, FIT rate data, and diagnostic coverage reports-to support system-level compliance with ISO 26262 (ASIL-B) and IEC 61508 (SIL-2). The BQ771817DPJR itself is not certified, but its design and supporting materials enable integration into safety-critical battery management systems.