Texas Instruments BQ7721610PWR

Overview

BQ7721610PWR from Texas Instruments is a dedicated Li-ion battery pack protection IC for 3- to 16-series cell stacks, providing independent overvoltage (4.25 V), undervoltage (2.5 V), open-wire, and overtemperature (83°C) detection with fixed 4 s delay timers. It features active-high COUT (6 V drive) and active-low DOUT outputs, ±10 mV OVP accuracy at 25°C, and <1 µA quiescent current - used in cordless power tools and e-bike battery management systems.

For engineers reviewing the BQ7721610PWR datasheet, BQ7721610PWR pinout, BQ7721610PWR application, or BQ7721610PWR equivalent, key selection considerations include its dual-output fault signaling architecture, factory-programmed 4 s OV/UV delay, 24-pin TSSOP package with floating NC pins, and compatibility with external NTC thermistors for thermal monitoring in high-reliability portable energy storage designs.

Technical Context

The BQ7721610PWR implements independent per-cell voltage monitoring across up to 16 series-connected Li-ion cells using precision analog comparators with ±10 mV OVP accuracy at 25°C and ±20 mV over 0°C–60°C. Its internal delay timer initiates on any fault condition - overvoltage, undervoltage, open-wire, or overtemperature - and triggers COUT/DOUT after 4 s (OV/UV) or 4 s (OT/OW).

It uses ratiometric TS pin sensing with internal 20 kΩ pullup to detect overtemperature via external NTC resistance thresholds (e.g., 1525 Ω for 83°C), while open-wire detection applies 50 µA pulsed sink current to each Vx input. COUT is configured as active-high 6 V drive; DOUT is active-low open-drain, enabling direct interface with external FET gate drivers or fuse control logic.

Key Specifications

Pinout & Package

24-pin TSSOP (PW) package with 0.65 mm lead pitch, 4.40 mm × 7.80 mm body size (6.40 mm × 7.80 mm including leads). Pins 1 and 15–16 are NC (not connected); VSS serves as common ground reference for all cell inputs and IC substrate.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ7721607PWR and BQ7721613PWR, the BQ7721610PWR provides optimal balance of 2.5 V undervoltage cutoff, active-low DOUT for simplified FET gate control, and no undertemperature functionality - reducing design complexity for mid-range power tool applications where low-temperature operation is not required.

Availability

BQ7721610PWR 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 reliability under industrial temperature conditions.

Supply support for BQ7721610PWR 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 signal chain solutions.

The BQ77216xx product line is designed specifically for cost-sensitive, high-volume Li-ion battery pack protection in portable power equipment - emphasizing factory-programmed precision, minimal external components, and robust fault signaling without microcontroller dependency.

FAQ

What is the overvoltage protection threshold and accuracy of the BQ7721610PWR?

The BQ7721610PWR has a factory-programmed overvoltage protection (OVP) threshold of 4.25 V with ±10 mV accuracy at 25°C and ±20 mV accuracy from 0°C to 60°C. This precision enables reliable cell balancing and prevents overcharge in multi-cell Li-ion stacks without requiring calibration. The BQ7721610PWR achieves this using trimmed internal references and low-drift comparator circuitry integrated into its 24-pin TSSOP package.

How does the BQ7721610PWR handle open-wire detection?

The BQ7721610PWR performs open-wire detection by applying a 50 µA pulsed sink current to each Vx input every 128 ms for 128 µs. If Vn falls below Vn−1 − 200 mV, the device initiates its 4 s delay timer and asserts both COUT and DOUT upon expiration. This method allows detection of disconnected cells without external circuitry. The BQ7721610PWR maintains <100 nA leakage per input when open-wire detection is disabled, minimizing parasitic discharge.

What are the output drive configurations for COUT and DOUT on the BQ7721610PWR?

The BQ7721610PWR configures COUT as an active-high CMOS output capable of driving up to 6 V, while DOUT is an active-low open-drain output. This dual-drive architecture allows direct interfacing with high-side and low-side FET gates or external pull-up resistors. The BQ7721610PWR's COUT can source 4.5 mA during fault, and DOUT sinks up to 3 mA - sufficient to drive typical MOSFET gate drivers without buffering.

Does the BQ7721610PWR support temperature monitoring, and how is it implemented?

Yes, the BQ7721610PWR supports overtemperature monitoring via its TS pin, which interfaces with an external NTC thermistor using an internal 20 kΩ pullup resistor. It detects 83°C based on a threshold resistance of 1525 Ω, triggering both COUT and DOUT after a 4 s delay. The BQ7721610PWR does not support undertemperature protection - unlike some variants such as BQ7721607PWR - making it optimized for applications where only high-temperature cutoff is required.

What is Customer Test Mode (CTM), and how is it activated on the BQ7721610PWR?

Customer Test Mode (CTM) reduces the BQ7721610PWR's fault delay time from seconds to 50 ms for rapid production-line validation. It is activated by raising VDD to at least 12 V above V16 - for example, applying 58 V to VDD when V16 = 46 V. The BQ7721610PWR exits CTM automatically when the VDD–V16 differential drops below 10 V. This mode avoids permanent configuration changes and requires no OTP reprogramming.