Texas Instruments BQ771801DPJR

Overview

BQ771801DPJR from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 3 s internal delay timer, and N-channel open-drain active-low output. It independently monitors each cell voltage and triggers fault signaling upon overvoltage detection-used in cordless power tools and e-bike battery management systems.

For engineers reviewing the BQ771801DPJR datasheet, BQ771801DPJR pinout, BQ771801DPJR application, or BQ771801DPJR equivalent, key selection criteria include fixed 4.275 V overvoltage threshold, 0.05 V hysteresis, sub-1 µA quiescent current, <100 nA per-cell input leakage, and QFN-8 (3.0 mm × 4.0 mm) package compatibility with automated PCB assembly.

Technical Context

The BQ771801DPJR implements independent differential cell voltage sensing across five inputs (V1–V5), comparing each against a precision internal reference (VOV = 4.275 V). Its internal delay timer initiates on first OVP detection and expires after 3 s to assert the active-low OUT signal.

This device operates in NORMAL mode when all cell voltages remain below VOV, maintaining high-impedance OUT; it transitions to OVERVOLTAGE mode upon threshold breach, pulling OUT low via N-channel driver. Customer Test Mode reduces delay to ~15 ms for production-line validation without altering external RC components.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, exposed thermal pad, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ771801DPJR, BQ771803DPJR offers faster response for time-critical protection, while BQ771802DPJR lowers the trip point for aging-aware battery systems-neither is pin-compatible with alternate delay or threshold variants, requiring layout and firmware review for substitution.

Availability

BQ771801DPJR 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 support, and automotive-grade temperature operation.

Supply support for BQ771801DPJR 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 ICs and functional safety infrastructure.

The BQ7718 family was designed specifically for cost-sensitive, high-reliability Li-ion battery pack overvoltage protection-emphasizing ultra-low power, fixed-threshold accuracy, and simplified external component count.

FAQ

What is the overvoltage protection threshold of the BQ771801DPJR?

The BQ771801DPJR has a fixed overvoltage protection threshold of 4.275 V with ±10 mV accuracy at 25°C. This value is trimmed at wafer test and remains stable across –40°C to +110°C operating temperature, making it suitable for demanding portable and industrial battery applications where precise cell-level voltage clamping is critical. The BQ771801DPJR does not require external resistors to set this threshold.

Does the BQ771801DPJR support 2-cell, 3-cell, 4-cell, and 5-cell Li-ion battery configurations?

Yes, the BQ771801DPJR supports 2- to 5-series Li-ion battery configurations through its five independent voltage sense inputs (V1–V5) and VSS reference. Unused inputs (e.g., V5 and V4 in a 2S pack) are left unconnected or tied to appropriate potentials per TI's layout guidelines. The BQ771801DPJR automatically adapts sensing range without configuration pins or firmware.

What output drive capability does the BQ771801DPJR provide on its OUT pin?

The BQ771801DPJR features an N-channel open-drain active-low OUT pin capable of sinking up to 14 mA when asserted, with typical VOL of 250–400 mV at 100 µA sink current. It requires an external pull-up resistor to PACK+ or another logic rail. The BQ771801DPJR does not source current on OUT-its inactive state is high-impedance, enabling wired-OR fault bus architectures.

How does the Customer Test Mode (CTM) function in the BQ771801DPJR?

Customer Test Mode in the BQ771801DPJR reduces the overvoltage delay timer from 3 s to approximately 15 ms when VDD exceeds V5 by at least 10 V. This allows rapid functional verification on production lines without modifying external components. The BQ771801DPJR exits CTM automatically when the VDD–V5 differential falls below 10 V, reverting to normal 3 s timing.

Is the BQ771801DPJR compatible with leaded MSOP-8 packages?

No, the BQ771801DPJR is exclusively offered in the 8-pin WSON (DPJ) package-3.00 mm × 4.00 mm, no leads, exposed thermal pad. While the broader BQ7718 family includes MSOP-8 variants (e.g., BQ771801DGKR), the DPJR suffix denotes the DPJ package only. Substituting package types requires verifying thermal performance, solder paste profile, and PCB land pattern compatibility for the BQ771801DPJR.