Texas Instruments BQ771604DPJT

Overview

BQ771604DPJT from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.200 V fixed overvoltage threshold, 50 mV hysteresis, and external capacitor-programmed delay (1–2 s with 0.1 µF). It operates across –40°C to +110°C and delivers <100 nA per-cell input leakage for high-accuracy cell monitoring in e-bike battery management systems.

For engineers reviewing the BQ771604DPJT datasheet, BQ771604DPJT pinout, BQ771604DPJT application, or BQ771604DPJT equivalent, key selection criteria include its CMOS active-high output drive, WSON-8 package compatibility with space-constrained pack designs, low 1 µA quiescent current during normal operation, and fault-detection capability for open/shorted delay capacitors - all critical for safety-certified portable power systems.

Technical Context

The BQ771604DPJT independently monitors up to four differential cell voltages (V1–VSS through V4–V3) using internal precision references and comparator circuitry. Its overvoltage detection triggers an external RC-based delay timer via the CD pin, with built-in timeout detection to force fault output even if the capacitor is open or shorted.

It supports Customer Test Mode (activated by shorting CD to VSS), reducing OV response time to ≤170 ms for production-line functional verification. The device operates from 3 V to 20 V supply and maintains ±10 mV OVP accuracy at 25°C, degrading to ±54 mV at 110°C - enabling robust thermal margining in high-temperature battery environments.

Key Specifications

Pinout & Package

Package: 8-pin WSON (3.00 mm × 4.00 mm), moisture-sensitive level 1, lead-free (NiPdAu), suitable for automated reflow assembly in compact battery modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ771601DPJT and BQ771602DPJT, the BQ771604DPJT offers the lowest OVP threshold (4.200 V) among CMOS active-high variants, making it optimal for conservative voltage margins in high-reliability e-mobility applications where minimizing overcharge stress is prioritized over maximum energy utilization.

Availability

BQ771604DPJT is available at Aetrix Electronics and suitable for eBike battery management, power tool safety systems, and eScooter pack protection requiring stable component supply, long-lifecycle support, and automotive-grade thermal performance.

Supply support for BQ771604DPJT 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 and embedded processing solutions, with over 50 years of innovation in power management and battery protection ICs.

The BQ7716 family is designed specifically for standalone overvoltage protection in multi-cell Li-ion battery packs, targeting cost-sensitive, high-volume portable and light electric vehicle applications where hardware-enforced safety is mandatory.

FAQ

What is the exact overvoltage protection threshold voltage for the BQ771604DPJT?

The BQ771604DPJT has a fixed overvoltage protection threshold of 4.200 V, specified with ±10 mV accuracy at 25°C and ±54 mV maximum deviation across –40°C to +110°C. This value is factory-trimmed and does not require external configuration; it applies uniformly to all monitored cells (V1–VSS through V4–V3) in the BQ771604DPJT device.

Does the BQ771604DPJT support 2-cell, 3-cell, and 4-cell Li-ion battery configurations?

Yes, the BQ771604DPJT supports 2-series, 3-series, and 4-series Li-ion battery configurations. For 2S operation, V3 and V4 pins are shorted to V2; for 3S, V4 is shorted to V3. All configurations use the same BQ771604DPJT device without variant selection - pin mapping and internal sensing adapt automatically based on external connections per TI's application schematics.

How is the overvoltage delay time set on the BQ771604DPJT?

The BQ771604DPJT uses an external capacitor connected to the CD pin to set the overvoltage delay time. With a 0.1 µF capacitor, the delay ranges from 1 s to 2 s, calculated as t_CD = K × C_CD, where K = 10–20. The CD pin includes fault detection: if the capacitor is open or shorted, the BQ771604DPJT forces immediate OUT activation to ensure fail-safe behavior.

What is the output type and drive capability of the BQ771604DPJT?

The BQ771604DPJT features a CMOS active-high output. When triggered, OUT drives high to ≥6 V (at VDD = 14.4 V, IOH = 100 µA) or to VDD – 0.3 V under single-cell power conditions. When inactive, it sinks 0.5–14 mA. Unlike open-drain variants, the BQ771604DPJT requires no external pull-up resistor, simplifying PCB layout and reducing component count.

What package and thermal characteristics does the BQ771604DPJT have?

The BQ771604DPJT is housed in an 8-pin WSON package measuring 3.00 mm × 4.00 mm with 0.5 mm pitch. It has a junction-to-ambient thermal resistance (R_θJA) of 56.6°C/W and junction-to-board (R_θJB) of 30.6°C/W. These values enable reliable operation up to +110°C ambient when mounted on standard 2-layer FR-4 with adequate copper pour, as validated in TI's SLUSAX0E production data.