Texas Instruments BQ771800DPJT

Overview

BQ771800DPJT 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 BQ771800DPJT datasheet, BQ771800DPJT pinout, BQ771800DPJT application, or BQ771800DPJT equivalent, key selection criteria include fixed 4.300 V overvoltage threshold, 8-pin QFN (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 BQ771800DPJT implements independent per-cell voltage sensing across five differential inputs (V1–V5 relative to VSS), comparing each against a precision 4.300 V reference (VOV) with 300 mV hysteresis. Upon detection of any cell exceeding VOV, a monolithic internal delay timer initiates and triggers the CMOS active-high OUT signal after 4 seconds.

It operates across –40°C to 110°C with supply voltage from 3 V to 25 V, supports Customer Test Mode (CTM) for sub-15 ms fault verification, and integrates no external timing components-delay is fixed and factory-trimmed. The device requires RC filtering on all sense inputs and VDD, with RIN = 1 kΩ recommended for calibrated accuracy.

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 BQ771800DPJT, BQ771806DPJT offers higher voltage tolerance for advanced Li-ion variants, while BQ771801DPJT trades threshold and timing for active-low signaling flexibility-both retain identical 8-pin QFN packaging and functional safety documentation support.

Availability

BQ771800DPJT is available at Aetrix Electronics and suitable for handheld power tools, e-bike battery packs, and cordless vacuum cleaner designs requiring stable component supply, long-lifecycle assurance, and functional safety documentation support.

Supply support for BQ771800DPJT 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, embedded processing, and connectivity solutions with emphasis on reliability, precision, and industrial-grade performance.

The BQ7718 family is designed specifically for standalone, high-accuracy overvoltage protection in multi-cell Li-ion battery packs-targeting cost-sensitive, safety-critical portable and mobility applications where simplicity and proven fault coverage are essential.

FAQ

What is the overvoltage protection threshold and accuracy of the BQ771800DPJT?

The BQ771800DPJT has a fixed overvoltage protection threshold of 4.300 V with ±10 mV accuracy at 25°C, and maintains ±44 mV accuracy across its full operating temperature range (–40°C to 110°C). This precision ensures reliable cell-level cutoff before dangerous overcharge conditions develop, and is factory-trimmed-no external calibration is required for BQ771800DPJT.

Does the BQ771800DPJT require external timing components for its overvoltage delay?

No, the BQ771800DPJT incorporates an internal fixed 4-second delay timer-no external capacitors or resistors are needed to set the delay. This simplifies PCB layout, reduces BOM count, and improves consistency across production units. The delay is factory-programmed and unalterable, ensuring repeatable fault response timing for BQ771800DPJT in every application.

How does the BQ771800DPJT interface with external protection FETs or controllers?

The BQ771800DPJT features a CMOS active-high OUT pin capable of sourcing up to 4.5 mA. It can directly drive the gate of a high-side N-channel FET driver or assert a logic-high fault signal to a microcontroller GPIO. No external pull-up is required, unlike open-drain alternatives. This direct-drive capability streamlines system design and improves noise immunity for BQ771800DPJT-based protection circuits.

What package type and footprint does the BQ771800DPJT use?

The BQ771800DPJT uses an 8-pin WSON (DPJ) package measuring 3.00 mm × 4.00 mm with wettable flanks, RoHS-compliant, and MSL Level-1 rated. Its compact, thermally enhanced footprint supports high-density battery pack PCB layouts and is compatible with standard reflow processes-no special handling is needed for BQ771800DPJT assembly.

Is functional safety documentation available for the BQ771800DPJT?

Yes, Texas Instruments provides functional safety documentation for the BQ771800DPJT to aid system-level ISO 26262 and IEC 61508 compliance efforts. This includes FIT rate data, failure mode analysis, and diagnostic coverage guidance-enabling BQ771800DPJT integration into ASIL-B or SIL-2 battery protection architectures without requiring additional qualification effort.