Texas Instruments BQ771824DPJR

Overview

BQ771824DPJR from Texas Instruments is a dedicated overvoltage protection IC for 2- to 5-series Li-ion battery packs, featuring a fixed 3.850 V OVP threshold, ±10 mV detection accuracy at 25°C, 4 s internal delay timer, and CMOS active-high output drive. It operates across –40°C to 110°C and supports handheld power tools and cordless vacuum cleaner battery management systems.

For engineers reviewing the BQ771824DPJR datasheet, BQ771824DPJR pinout, BQ771824DPJR application, or BQ771824DPJR equivalent, key selection criteria include cell count compatibility (2–5S), OVP threshold tolerance, delay timing consistency, low quiescent current (<2 µA), and functional safety documentation support.

Technical Context

The BQ771824DPJR independently monitors up to five cell voltages (V1–V5) against a precision 3.850 V reference with 300 mV hysteresis. Its internal delay timer initiates upon any cell exceeding VOV and triggers the CMOS-active-high OUT signal after 4 s, enabling robust fault response without external timing components.

It integrates functional safety capability with documented design support, operates from 3 V to 25 V supply, consumes ≈1 µA in normal mode, and maintains <100 nA leakage per cell input-critical for long-term pack self-discharge control in portable power applications.

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 BQ771800DPJR and BQ771825DPJR, the BQ771824DPJR offers the lowest OVP threshold (3.850 V) in the family with CMOS active-high drive-making it uniquely suitable for lithium iron phosphate (LFP) or low-voltage Li-ion cells where early overvoltage intervention is critical.

Availability

BQ771824DPJR is available at Aetrix Electronics and suitable for handheld power tools, cordless vacuum cleaners, and light electric vehicle battery packs requiring stable component supply, long-lifecycle support, and functional safety documentation.

Supply support for BQ771824DPJR 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 standalone, hardware-based overvoltage protection in multi-cell Li-ion battery packs-targeting cost-sensitive, safety-critical portable power applications without MCU dependency.

FAQ

What is the overvoltage protection threshold of the BQ771824DPJR?

The BQ771824DPJR has a fixed overvoltage protection threshold of 3.850 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and does not require external configuration. The device maintains this threshold across its full operating temperature range (–40°C to 110°C), with maximum drift of ±54 mV at temperature extremes-ensuring reliable protection for low-voltage Li-ion and LFP cells.

Does the BQ771824DPJR support 2-cell and 5-cell battery configurations?

Yes, the BQ771824DPJR supports 2-series to 5-series Li-ion battery configurations. It monitors five independent cell voltage inputs (V1–V5) referenced differentially, allowing flexible implementation from 2S (using V1 and V2 only) up to 5S (using all five inputs). Unused inputs must be properly terminated per TI's layout guidelines to avoid floating nodes and ensure accurate measurements.

What type of output drive does the BQ771824DPJR provide?

The BQ771824DPJR features a CMOS active-high output drive on the OUT pin. When an overvoltage condition is detected and the 4 s delay expires, OUT transitions to a high state (VDD – 0.3 V minimum at 100 µA sink) and can source up to 4.5 mA. During normal operation, OUT remains low. This eliminates the need for external pull-up resistors used in open-drain variants.

How does the Customer Test Mode (CTM) function in the BQ771824DPJR?

The BQ771824DPJR enters Customer Test Mode when VDD exceeds V5 by at least 10 V, reducing the overvoltage delay time from 4 s to approximately 15 ms. This allows rapid functional verification on production lines without waiting for full delay timing. CTM exits automatically when the VDD-to-V5 differential falls below 10 V, returning the device to normal 4 s delay operation.

Is functional safety documentation available for the BQ771824DPJR?

Yes, Texas Instruments provides functional safety documentation for the BQ771824DPJR to aid system-level safety analysis per ISO 26262 (ASIL-B) and IEC 61508. This includes failure mode analysis, FIT rate data, and diagnostic coverage guidance-enabling integration into automotive, industrial, and medical battery systems requiring certified safety compliance.