Texas Instruments BQ771807DPJT

Overview

BQ771807DPJT from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.450 V fixed overvoltage threshold, 3 s internal delay timer, and CMOS active-high 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 BQ771807DPJT datasheet, BQ771807DPJT pinout, BQ771807DPJT application, or BQ771807DPJT equivalent, key selection criteria include OVP threshold tolerance, delay timing consistency, leakage current per cell input (<100 nA), functional safety documentation support, and QFN-8 (3.00 mm × 4.00 mm) package compatibility with high-density battery pack layouts.

Technical Context

The BQ771807DPJT independently monitors up to five cell voltages (V1–V5 relative to VSS) using precision internal references and initiates a fixed 3 s delay timer upon detection of any cell exceeding 4.450 V. Its CMOS active-high output drives directly into protection FET control logic without external pull-up components.

It integrates functional safety capability with documented design support, operates at ultra-low quiescent current (≈1 µA under normal conditions), and maintains <100 nA leakage per sense input-critical for long-term battery self-discharge control in cordless tools and e-bike applications.

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 BQ771807DPJT, BQ771806DPJT offers lower OVP threshold for conservative voltage margins, while BQ771818DPJT trades longer delay for faster fault response-both retain identical pinout, package, and CMOS drive, enabling layout reuse with only threshold/delay validation needed.

Availability

BQ771807DPJT 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-term lifecycle support, and functional safety documentation.

Supply support for BQ771807DPJT 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 delivering analog and embedded processing solutions, with over 50 years of battery management innovation and automotive-grade reliability validation.

The BQ7718 family is designed specifically for cost-sensitive, high-volume Li-ion battery pack overvoltage protection-emphasizing zero-external-component simplicity, ultra-low power, and functional safety readiness for consumer and industrial mobility applications.

FAQ

What is the overvoltage protection threshold of the BQ771807DPJT?

The BQ771807DPJT has a fixed overvoltage protection threshold of 4.450 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and unchangeable, ensuring consistent cell voltage clamping across production batches without external resistor networks. The BQ771807DPJT maintains this specification across its full operating temperature range of –40°C to 110°C, with worst-case drift bounded to ±54 mV at 110°C.

Does the BQ771807DPJT require external components for basic overvoltage protection functionality?

Yes-the BQ771807DPJT requires external RC filters on each Vx sense input (RIN ≈ 1 kΩ, CIN = 0.01–0.1 µF) and on VDD (RVD/CVD) for noise immunity and stable operation. These components are mandatory per TI's validated design; omitting them risks false triggering or measurement inaccuracy. No external delay capacitor is needed-the 3 s timer is fully internal.

How does the BQ771807DPJT handle multiple cell configurations (2S to 5S)?

The BQ771807DPJT supports 2- to 5-series configurations by connecting only the required Vx pins (e.g., V1–V2 for 2S, V1–V5 for 5S) and leaving unused Vx pins unconnected. All sense inputs share identical electrical characteristics and leakage (<100 nA). The device automatically detects active cell count via connected inputs and monitors each enabled cell independently for overvoltage.

Is the BQ771807DPJT compatible with functional safety standards like ISO 26262?

Yes-the BQ771807DPJT is Functional Safety-Capable, with TI providing documented FIT rates, failure mode analysis, and safety manual guidance to support ISO 26262 ASIL-B or IEC 61508 SIL-2 system-level certification. This applies specifically to the BQ771807DPJT variant and is not extrapolated from other family members.

What is the purpose of Customer Test Mode (CTM) in the BQ771807DPJT?

Customer Test Mode (CTM) reduces the overvoltage delay from 3 s to ~15 ms by applying VDD ≥10 V above V5, enabling rapid production-line verification of OVP timing without waiting for full delay cycles. CTM exits automatically when the VDD–V5 differential drops below 10 V. It is intended solely for factory test-not for field operation-and must avoid exceeding absolute maximum ratings.