Texas Instruments BQ771802DPJR

Overview

BQ771802DPJR from Texas Instruments is a precision overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 1 s internal delay timer, and NCH open-drain active-low output. It monitors each cell independently and delivers ultra-low quiescent current (≈1 µA) and sub-100 nA per-cell leakage, enabling robust protection in cordless power tools and e-bike battery management systems.

For engineers reviewing the BQ771802DPJR datasheet, BQ771802DPJR pinout, BQ771802DPJR application, or BQ771802DPJR equivalent, key selection criteria include its fixed 4.225 V overvoltage threshold, 0.3 V hysteresis, QFN-8 (3.0 mm × 4.0 mm) package, functional safety documentation support, and compatibility with Customer Test Mode for accelerated production-line validation.

Technical Context

The BQ771802DPJR implements independent differential voltage sensing across up to five cells (V1–VSS through V5–V4), triggering an internal 1-second delay timer upon detection of any cell exceeding 4.225 V. Its NCH open-drain output actively pulls low during overvoltage fault conditions and remains high-impedance otherwise, requiring an external pull-up resistor.

It operates across –40°C to 110°C ambient temperature with supply voltage from 3 V to 25 V, supports Customer Test Mode (CTM) with ~15 ms fault detection delay, and integrates ESD protection (±2000 V HBM). The device uses no external timing components - delay is fully internal and factory-trimmed.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm body, 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 BQ771802DPJR, BQ771803DPJR offers tighter hysteresis for rapid fault recovery, while BQ771801DPJR provides extended delay margin against ripple-induced false triggers - both share identical pinout, package, and functional safety documentation support.

Availability

BQ771802DPJR 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 BQ771802DPJR 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 technologies for industrial, automotive, and personal electronics markets.

The BQ7718 family is designed specifically for high-reliability, low-power overvoltage protection in multi-cell Li-ion battery packs - emphasizing precision, thermal robustness, and production-test efficiency.

FAQ

What is the overvoltage protection threshold of the BQ771802DPJR?

The BQ771802DPJR has a fixed overvoltage protection threshold of 4.225 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and remains stable across –40°C to 110°C, ensuring consistent cell-level protection without external calibration. The BQ771802DPJR's tight tolerance prevents premature shutdown while guarding against electrolyte degradation in Li-ion cells.

Does the BQ771802DPJR require external timing components for its delay function?

No, the BQ771802DPJR incorporates a fully internal, factory-programmed 1-second delay timer - no external capacitor or resistor is needed. This eliminates timing component variation, reduces PCB area, and improves manufacturing yield. The BQ771802DPJR's integrated timer is specified from 0.8 s to 1.2 s across temperature and voltage, ensuring reliable fault response without design overhead.

How does the BQ771802DPJR handle multiple-cell battery configurations?

The BQ771802DPJR supports 2- to 5-series Li-ion configurations via five dedicated sense inputs (V1–V5) and VSS, enabling independent differential monitoring of each cell. It does not require daisy-chaining or communication buses - each cell voltage is measured locally. The BQ771802DPJR's architecture ensures accurate protection even with cell-to-cell voltage imbalances up to 5 V per stage.

What output drive configuration does the BQ771802DPJR use?

The BQ771802DPJR features an NCH open-drain active-low output (OUT pin), which sinks current when an overvoltage condition is detected after the 1 s delay. An external pull-up resistor to PACK+ or system rail is required. This configuration allows direct interfacing with microcontroller interrupt pins or external FET gate drivers. The BQ771802DPJR's output is not CMOS push-pull - it cannot source current in the active state.

Is functional safety documentation available for the BQ771802DPJR?

Yes, Texas Instruments provides functional safety documentation for the BQ771802DPJR to aid ISO 26262 and IEC 61508 system-level safety analysis. This includes FIT rate data, failure mode coverage reports, and diagnostic capability descriptions. The BQ771802DPJR itself is not ASIL-certified, but the supporting documentation enables integration into ASIL-B/C battery management systems. All safety-related content is published in the official BQ7718 technical documentation.