Texas Instruments BQ771808DPJR

Overview

BQ771808DPJR from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.200 V fixed overvoltage threshold, 1 s internal delay timer, and NCH 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 BQ771808DPJR datasheet, BQ771808DPJR pinout, BQ771808DPJR application, or BQ771808DPJR equivalent, key selection criteria include its 1 s OV delay, 4.200 V trip point with 0–100 mV hysteresis, <100 nA per-cell input leakage, 1 µA supply current under undervoltage conditions, and compatibility with QFN (DPJ) packaging for compact battery pack integration.

Technical Context

The BQ771808DPJR independently monitors up to five differential cell voltages (V1–VSS through V5–V4) using precision internal references. Upon detecting any cell exceeding 4.200 V, it initiates a fixed 1 s delay timer before asserting the open-drain OUT pin low.

This device implements Customer Test Mode (CTM) with sub-15 ms fault detection latency for production-line validation. Its functional safety-capable design includes documentation support for ISO 26262 and IEC 61508 system-level analysis, and it requires external RC filters on all Vx inputs for noise immunity.

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 BQ771808DPJR, BQ771802DPJR offers +25 mV higher OVP for margin-sensitive chemistries, while BQ771803DPJR adds +75 mV headroom-both retain identical timing, leakage, and package, enabling direct substitution where trip voltage is the only variable.

Availability

BQ771808DPJR is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, light electric vehicles, and UPS battery backup systems requiring stable component supply, long-lifecycle support, and functional safety documentation.

Supply support for BQ771808DPJR 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 industrial interface technologies.

The BQ7718 family is designed specifically for cost-effective, high-accuracy overvoltage protection in multi-cell Li-ion battery packs used in portable and motive applications-emphasizing low power, small footprint, and functional safety readiness.

FAQ

What is the overvoltage protection threshold and accuracy of the BQ771808DPJR?

The BQ771808DPJR has a fixed overvoltage protection threshold of 4.200 V with ±10 mV accuracy at 25°C. Its accuracy degrades to ±54 mV at 110°C, and it features 0–100 mV programmable hysteresis to prevent oscillation near the trip point. This specification ensures reliable protection for standard Li-ion cells without external calibration components.

How does the BQ771808DPJR handle multiple series-connected cells?

The BQ771808DPJR independently monitors up to five differential cell voltages (V1–VSS, V2–V1, ..., V5–V4) using dedicated sense inputs. It triggers the OUT pin if any single cell exceeds 4.200 V, supporting 2-, 3-, 4-, or 5-series configurations without hardware changes. Each input requires an external RIN/CIN filter for noise immunity.

What is the function and timing of the internal delay timer in the BQ771808DPJR?

The BQ771808DPJR incorporates a fixed 1 s internal delay timer that starts upon detection of any cell overvoltage condition. After expiration, the NCH open-drain OUT pin pulls low to signal fault. This delay prevents false triggering from short transients while ensuring timely response to sustained overvoltage events.

Does the BQ771808DPJR support production-line testing, and how?

Yes, the BQ771808DPJR supports Customer Test Mode (CTM), which reduces fault detection latency to <15 ms. To activate CTM, apply VDD at least 10 V higher than V5; the device automatically exits CTM when this differential drops below threshold. This enables fast, repeatable OVP verification during battery pack manufacturing.

What package type and thermal characteristics does the BQ771808DPJR use?

The BQ771808DPJR is packaged in an 8-pin WSON (DPJ) case measuring 3.00 mm × 4.00 mm with wettable flanks. Its junction-to-ambient thermal resistance is 56.6°C/W, and it operates from –40°C to 110°C. The DPJ package supports automated optical inspection and offers low thermal impedance for reliable performance in compact battery modules.