Texas Instruments BQ771602DPJT

Overview

BQ771602DPJT from Texas Instruments is a 2- to 4-series Li-ion battery overvoltage protection IC with N-channel open-drain active-low output, ±10 mV OVP accuracy, 4.225 V fixed overvoltage threshold, and external capacitor-programmed delay (1–2 s with 0.1 µF). It operates across –40°C to +110°C and supports eBike and power tool battery packs.

For engineers reviewing the BQ771602DPJT datasheet, BQ771602DPJT pinout, BQ771602DPJT application, or BQ771602DPJT equivalent, key selection factors include its NCH open-drain active-low output configuration, 4.225 V OVP threshold with 50 mV hysteresis, 1 µA supply current, <100 nA per-cell input leakage, and WSON-8 (3.0 mm × 4.0 mm) package compatibility with high-density battery management layouts.

Technical Context

The BQ771602DPJT independently monitors up to four cell voltages using precision analog comparators referenced to a trimmed internal bandgap. Upon detection of any cell exceeding 4.225 V, it initiates an external RC delay timer via the CD pin-charging to 1.5 V then discharging at 100 nA-and triggers the OUT pin low after timeout.

In OVERVOLTAGE mode, the NCH open-drain output sinks up to 14 mA when active; in NORMAL mode, OUT remains high-impedance and requires an external pull-up. The device includes CD fault detection for open/shorted capacitors and supports Customer Test Mode with ≤170 ms delay when CD is shorted to VSS.

Key Specifications

Pinout & Package

Package: 8-pin WSON (DPJ), 3.00 mm × 4.00 mm, exposed thermal pad, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ771601DPJT, BQ771602DPJT's active-low output simplifies integration into existing fault-bus architectures using pull-up resistors; compared with BQ771604DPJT, its 4.225 V threshold better matches fresh NMC cell voltage profiles, delaying protective shutdown until higher stress levels occur.

Availability

BQ771602DPJT is available at Aetrix Electronics and suitable for power tools, eBikes, and light electric vehicles requiring stable component supply, long-lifecycle support, and automotive-grade temperature performance.

Supply support for BQ771602DPJT 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 BQ7716 family is designed specifically for standalone, high-accuracy overvoltage protection in multi-cell Li-ion battery packs - prioritizing robustness, low power, and fault-tolerant timing in cost-sensitive portable and mobility applications.

FAQ

What is the overvoltage protection threshold and accuracy of the BQ771602DPJT?

The BQ771602DPJT has a fixed overvoltage protection (OVP) threshold of 4.225 V with ±10 mV accuracy at 25°C, and total accuracy drift of ±54 mV across –40°C to +110°C. This specification is measured per cell input (V1–V4) and ensures consistent clamping behavior regardless of stack configuration (2S–4S). The BQ771602DPJT achieves this via laser-trimmed internal references and matched comparator design, eliminating need for external calibration.

How does the external delay capacitor (CD pin) function in the BQ771602DPJT?

The CD pin on the BQ771602DPJT connects to an external capacitor (typically 0.1 µF) that sets the overvoltage delay time between fault detection and OUT activation. Upon OVP detection, the BQ771602DPJT charges the CD pin to 1.5 V, then discharges it at 100 nA; when voltage falls below threshold, OUT goes active-low. The BQ771602DPJT also verifies CD pin functionality - triggering OUT if the capacitor is open or shorted - ensuring fail-safe operation.

What output configuration does the BQ771602DPJT use, and how should it be interfaced?

The BQ771602DPJT features an N-channel open-drain, active-low output (OUT pin). It must be externally pulled up to PACK+ or a compatible logic rail (≤20 V) using a resistor (typically 100 kΩ). During overvoltage, the BQ771602DPJT sinks up to 14 mA; in normal operation, OUT is high-impedance. This configuration supports wired-OR fault buses and avoids contention with other protection devices sharing the same signal line.

Does the BQ771602DPJT support 2-cell, 3-cell, and 4-cell battery configurations?

Yes, the BQ771602DPJT supports 2-series, 3-series, and 4-series Li-ion battery configurations. Unused sense inputs (e.g., V4 in a 2S stack) must be shorted to the adjacent lower-sense pin (e.g., V4 to V3) as specified in TI's application schematics. All configurations retain full OVP accuracy, leakage performance, and delay timing - verified in TI's typical application figures for 2S, 3S, and 4S topologies.

What is the quiescent current and input leakage of the BQ771602DPJT under normal operation?

Under normal operation (all cell voltages below 4.225 V), the BQ771602DPJT draws ≈1 µA supply current (ICC) and exhibits <100 nA leakage per cell input (V1–V4). These values are specified across –40°C to +110°C and enable multi-year battery shelf life in always-connected applications. The BQ771602DPJT achieves ultra-low leakage through optimized input ESD structures and biasing, with no trade-off in OVP speed or accuracy.