Texas Instruments BQ771817DPJT

Overview

BQ771817DPJT 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 and e-bike battery management systems.

For engineers reviewing the BQ771817DPJT datasheet, BQ771817DPJT pinout, BQ771817DPJT application, or BQ771817DPJT equivalent, key selection criteria include cell count compatibility (2–5S), OVP hysteresis (50 mV), ultra-low quiescent current (≈1 µA), and QFN-8 package footprint (3.00 mm × 4.00 mm) with functional safety documentation support.

Technical Context

The BQ771817DPJT independently monitors up to five cell voltages using differential sensing inputs (V1–V5 relative to VSS), triggering a fixed 1 s delay timer upon detection of any cell exceeding 4.275 V. Its CMOS active-high output drives fault signaling without external pull-up components.

It integrates internal voltage reference and timing circuitry, eliminating external RC timing components. The device supports Customer Test Mode (CTM) with <15 ms fault detection delay for production-line validation while maintaining full functional safety capability per TI's documentation.

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 BQ771817DPJT, BQ771801DPJT offers longer 3 s delay and active-low output for fail-safe integration, while BQ771803DPJT matches its 1 s timing but requires external pull-up-making BQ771817DPJT optimal for simplified CMOS-compatible designs.

Availability

BQ771817DPJT is available at Aetrix Electronics and suitable for handheld power tools, e-bikes, and UPS battery backup systems requiring stable component supply, long-lifecycle assurance, and functional safety documentation support.

Supply support for BQ771817DPJT 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 decades of battery management system expertise.

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 via Customer Test Mode.

FAQ

What is the overvoltage protection threshold and accuracy of the BQ771817DPJT?

The BQ771817DPJT has a fixed overvoltage protection threshold of 4.275 V with ±10 mV accuracy at 25°C and ±54 mV maximum drift over –40°C to 110°C. This specification ensures reliable protection for standard 4.2 V nominal Li-ion cells while accommodating manufacturing tolerances and temperature-induced voltage shifts. The BQ771817DPJT achieves this precision using an internal trimmed voltage reference and matched comparator architecture.

Does the BQ771817DPJT require external timing components for its overvoltage delay?

No, the BQ771817DPJT features an internal 1 s delay timer and requires no external RC network. This eliminates component count, reduces PCB area, and improves timing consistency across temperature and unit-to-unit variation. The BQ771817DPJT's integrated timer is factory-trimmed and specified from 0.8 s to 1.2 s over full operating temperature range, ensuring predictable fault response without calibration.

How does the BQ771817DPJT support production testing of battery packs?

The BQ771817DPJT includes Customer Test Mode (CTM), which reduces overvoltage fault detection delay to under 15 ms when VDD exceeds V5 by ≥10 V. This enables rapid functional verification on production lines without modifying hardware or waiting for full 1 s delays. CTM is automatically exited when the VDD–V5 differential drops below 10 V, making it safe and repeatable for high-volume test fixtures.

What package type and mounting features does the BQ771817DPJT use?

The BQ771817DPJT uses an 8-pin WSON (DPJ) package measuring 3.00 mm × 4.00 mm with wettable flanks for automated optical inspection (AOI) of solder joints. It is RoHS-compliant, rated MSL Level-1 (unlimited floor life), and supports reflow up to 260°C peak. The BQ771817DPJT's exposed thermal pad enhances thermal dissipation in compact battery pack layouts.

Can the BQ771817DPJT monitor fewer than five cells?

Yes, the BQ771817DPJT supports 2-, 3-, 4-, and 5-series configurations by connecting only the required Vx pins (e.g., V1–V2–VSS for 2S; V1–V2–V3–VSS for 3S). Unused higher-order inputs (e.g., V4, V5 in 2S) must be left unconnected or tied to appropriate potentials per TI layout guidelines. The BQ771817DPJT's architecture ensures accurate differential sensing regardless of stack size within its supported range.