Texas Instruments BQ771600DPJT

Overview

BQ771600DPJT from Texas Instruments is a precision overvoltage protection IC for 2- to 4-series Li-ion battery packs, featuring ±10 mV OVP accuracy, 4.3 V fixed overvoltage threshold, and external capacitor-programmed delay (1–2 s with 0.1 µF). It monitors each cell independently and drives a CMOS active-high fault signal, used in eBike battery management systems to prevent cell damage during charging.

For engineers reviewing the BQ771600DPJT datasheet, BQ771600DPJT pinout, BQ771600DPJT application, or BQ771600DPJT equivalent, key selection criteria include its 8-pin WSON package, 1 µA quiescent current, <100 nA per-cell input leakage, CD pin fault detection capability, and support for Customer Test Mode with ≤170 ms reduced delay for production-line verification.

Technical Context

The BQ771600DPJT implements independent per-cell voltage sensing using precision analog comparators referenced to a stable internal bandgap. Its delay timer uses a two-phase CD pin control circuit: rapid charge to 1.5 V followed by controlled discharge at 100 nA, triggering OUT when CD falls below threshold.

It operates across –40°C to +110°C with 3 V to 20 V supply range, supports 2S–4S configurations via direct V1–V4 connections, and includes timeout detection for open/shorted CD capacitors-ensuring fail-safe output activation even under external component fault conditions.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ771601DPJT and BQ771611DPJT, the BQ771600DPJT provides the industry-standard 4.3 V OVP point optimized for mainstream NMC and LCO cells, offering the best balance of safety margin, cycle life, and compatibility with existing charger ICs - making it the default choice for certified 2S–4S portable power designs.

Availability

BQ771600DPJT is available at Aetrix Electronics and suitable for power tools, UPS battery backup, and light electric vehicles requiring stable component supply, long-term lifecycle support, and automotive-grade reliability under thermal stress.

Supply support for BQ771600DPJT 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 specializing in analog, embedded processing, and power management technologies, with decades of experience in battery safety ICs.

The BQ771600DPJT belongs to TI's BQ7716 family of standalone overvoltage protectors, designed specifically for cost-sensitive, high-reliability Li-ion battery packs in consumer and light industrial mobility applications.

FAQ

What is the overvoltage protection threshold of the BQ771600DPJT?

The BQ771600DPJT has a fixed overvoltage protection threshold of 4.300 V with ±10 mV accuracy at 25°C. This value is factory-trimmed and remains stable across –40°C to +110°C, with worst-case drift of ±54 mV at 110°C. The BQ771600DPJT uses this precise threshold to trigger protection before any single Li-ion cell exceeds safe voltage limits.

How does the external delay capacitor work on the BQ771600DPJT CD pin?

The BQ771600DPJT uses the CD pin to connect an external capacitor (0.1–1 µF) that sets the overvoltage delay time. Upon OVP detection, the IC rapidly charges CD to 1.5 V, then discharges it at 100 nA; when CD falls below threshold, OUT activates. For a 0.1 µF capacitor, delay ranges from 1–2 s. The BQ771600DPJT also detects CD open/short faults and triggers OUT immediately if charging fails.

Does the BQ771600DPJT support 2-cell, 3-cell, and 4-cell battery configurations?

Yes, the BQ771600DPJT supports 2S, 3S, and 4S Li-ion configurations. It features four independent cell inputs (V1–VSS, V2–V1, V3–V2, V4–V3); unused inputs are shorted to adjacent pins (e.g., V4 to V3 in 3S). All configurations use the same BQ771600DPJT device, with no configuration pins or firmware - scaling is achieved purely through external wiring per the datasheet layout guidelines.

What is the output drive capability of the BQ771600DPJT OUT pin?

The BQ771600DPJT OUT pin is a CMOS active-high driver capable of sourcing 4.5 mA minimum at VDD = 14.4 V and sinking 0.5–14 mA depending on load. It drives directly to VDD when active and presents high impedance when inactive - eliminating need for external pull-up resistors. This output behavior is fixed for the BQ771600DPJT variant and differs from NCH open-drain versions in the same family.

Can the BQ771600DPJT be used in automotive-grade applications?

The BQ771600DPJT operates from –40°C to +110°C and meets JEDEC JESD22-A114 HBM ±2000 V and JESD22-C101 CDM ±500 V ESD ratings, supporting under-hood and battery-pack environments. While not AEC-Q200 qualified, its thermal performance, low leakage (<100 nA), and robust CD fault detection make the BQ771600DPJT suitable for non-safety-critical automotive accessories and light EV subsystems where extended temperature operation is required.