Texas Instruments BQ771800DPJR

Overview

BQ771800DPJR from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4 s internal delay timer, and CMOS active-high output. It monitors each cell independently and delivers ultra-low quiescent current (≈1 µA) and per-cell leakage <100 nA, enabling robust protection in cordless power tools and e-bike battery management systems.

For engineers reviewing the BQ771800DPJR datasheet, BQ771800DPJR pinout, BQ771800DPJR application, or BQ771800DPJR equivalent, key selection criteria include fixed 4.300 V overvoltage threshold, 8-pin WSON (DPJ) 3.00 mm × 4.00 mm package, functional safety documentation support, and compatibility with Customer Test Mode for accelerated production-line validation.

Technical Context

The BQ771800DPJR implements independent differential sensing across five cell inputs (V1–V5 relative to VSS), comparing each against a precision 4.300 V reference. Its internal delay timer initiates upon first OVP detection and triggers a CMOS active-high OUT signal after exactly 4 s - no external timing components required.

This device operates across –40°C to 110°C ambient, accepts VDD from 3 V to 25 V, and maintains OVP accuracy within ±44 mV over full temperature range. Its low-power architecture enables direct integration into high-reliability battery packs where leakage and standby current critically impact self-discharge and shelf life.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ771800DPJR, BQ771806DPJR raises OVP by 50 mV for higher-voltage cells, while BQ771801DPJR trades fixed delay and output polarity for faster response and compatibility with active-low control logic - neither is pin-compatible, but both share identical DPJ packaging and sensing architecture.

Availability

BQ771800DPJR is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and UPS backup systems requiring stable component supply, long-lifecycle support, and functional safety documentation.

Supply support for BQ771800DPJR 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 specializing in analog and embedded processing technologies, with leadership in battery management, power conversion, and industrial signal chain solutions.

The BQ7718 family is designed specifically for high-reliability overvoltage protection in multi-cell Li-ion battery packs used in portable power equipment and light electric vehicles - emphasizing precision, low power, and production-test efficiency.

FAQ

What is the overvoltage protection threshold of the BQ771800DPJR?

The BQ771800DPJR has a fixed overvoltage protection threshold of 4.300 V per cell, with ±10 mV accuracy at 25°C and ±44 mV maximum deviation across –40°C to 110°C. This value is factory-trimmed and requires no external configuration - it applies uniformly to all five monitored cell positions (V1–V5) in the BQ771800DPJR.

Does the BQ771800DPJR require external timing components for its overvoltage delay?

No, the BQ771800DPJR integrates a fixed 4 s internal delay timer that activates automatically upon overvoltage detection - no external capacitors or resistors are needed. This simplifies layout, improves timing consistency across units, and eliminates component-related drift or tolerance stacking that would occur with discrete RC networks.

How does the BQ771800DPJR handle cell voltage sensing in a 3-series battery pack?

The BQ771800DPJR supports 2- to 5-series configurations by using only the required Vx pins: for a 3-series pack, V1, V2, and V3 are connected to cell terminals, V4 and V5 are left unconnected (no pull-down required), and VSS connects to the bottom cell's negative terminal. The IC automatically ignores unused high-order inputs without affecting accuracy or power consumption.

What output drive capability does the BQ771800DPJR provide on its OUT pin?

The BQ771800DPJR features a CMOS active-high output capable of sourcing 4.5 mA when pulled high (VDD = 18 V), with output voltage ≥6 V under load. When inactive, OUT remains near 0 V. This eliminates the need for external pull-up resistors and allows direct interfacing with microcontroller GPIOs or logic-level fault indicators.

Is the BQ771800DPJR suitable for functional safety–compliant battery systems?

Yes, the BQ771800DPJR is functional safety-capable: Texas Instruments provides documentation to aid ISO 26262 ASIL-B system-level design, including failure mode analysis, diagnostic coverage guidance, and FIT rate data. While the BQ771800DPJR itself is not certified, its architecture and support materials enable compliant BMS implementation in automotive-adjacent applications like e-bikes and industrial UPS.