Texas Instruments BQ7694202PFBR

Overview

BQ7694202PFBR from Texas Instruments is a high-accuracy battery monitor and protector IC for 3- to 10-series Li-ion, Li-polymer, and LiFePO₄ battery packs. It integrates dual ADCs for simultaneous voltage/current sampling, ±200-mV current sense range, <10 mV typical cell voltage measurement error, and autonomous or host-controlled cell balancing. It serves as the core protection and monitoring unit in cordless power tools and e-bike battery management systems.

For engineers reviewing the BQ7694202PFBR datasheet, BQ7694202PFBR pinout, BQ7694202PFBR application, or BQ7694202PFBR equivalent, key selection criteria include its I²C interface with CRC enabled, 3.3 V default REG1 LDO output, 48-pin TQFP (PFB) package, and support for high-side NFET protection with integrated charge pump.

Technical Context

The BQ7694202PFBR implements two independent ADCs: one for high-accuracy coulomb counting (input offset <1 µV typical) and another for cell voltage measurement (<10 mV typical error). Its protection subsystem includes configurable overvoltage, undervoltage, overtemperature, and overcurrent detection with both primary and secondary response layers.

It supports multiple low-power modes-NORMAL (286 µA), SLEEP (24–41 µA), DEEPSLEEP (9–10 µA), and SHUTDOWN (1 µA)-and features a 48-pin TQFP package with high-voltage tolerance (85 V on cell input pins) and random cell attach sequence tolerance for production-line robustness.

Key Specifications

Pinout & Package

Package: 48-pin TQFP (PFB), 7 mm × 7 mm body size, lead pitch 0.5 mm, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitor and protector applications.

Compared with BQ7694202PFBR, the BQ7694201PFBR offers SPI instead of I²C and lacks default REG1 regulation, while BQ7694203PFBR provides 5 V REG1 output-both require revalidation of communication firmware and LDO-dependent peripheral compatibility.

Availability

BQ7694202PFBR is available at Aetrix Electronics and suitable for cordless power tools, e-bikes, and vacuum cleaner battery packs requiring stable component supply, long-lifecycle support, and production-grade traceability.

Supply support for BQ7694202PFBR 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 battery management system expertise.

The BQ76942 product line delivers highly integrated, high-accuracy battery monitors for 3–10 series Li-based packs-designed specifically for industrial and consumer portable equipment demanding robust protection, low power, and production-ready configurability.

FAQ

What communication interfaces does the BQ7694202PFBR support?

The BQ7694202PFBR supports I²C at up to 400 kHz with CRC enabled, SPI, and HDQ one-wire interfaces. Its multifunction pins (SCL/SDA/HDQ/CFETOFF/DFETOFF) allow flexible routing and protocol selection without hardware changes. The I²C interface is factory-configured as the default for BQ7694202PFBR, and CRC validation ensures data integrity during register reads and writes-critical for safety-critical BMS operations.

How does the BQ7694202PFBR handle cell voltage measurement accuracy across temperature?

The BQ7694202PFBR achieves ±5 mV typical cell voltage accuracy at 25°C, degrading to ±15 mV over –40°C to 85°C. This specification includes post-calibration performance after board-level offset compensation. The device also performs cell 1 voltage validation during SLEEP mode to maintain accuracy during low-power operation. These values are measured differentially (VCx–VCx−1) and apply to all 10 cell inputs, ensuring consistent SOC estimation across full operating range.

What is the purpose of the REG1 LDO in the BQ7694202PFBR, and what voltage does it output by default?

The REG1 LDO in the BQ7694202PFBR is a programmable output supplying 1.8 V, 2.5 V, 3.0 V, 3.3 V, or 5.0 V to external circuitry such as microcontrollers or sensors. By default, BQ7694202PFBR configures REG1 to 3.3 V-distinguishing it from other variants like BQ7694201 (disabled) and BQ7694203 (5.0 V). This eliminates the need for an external regulator in many 3.3 V system designs, reducing BOM cost and PCB area.

Does the BQ7694202PFBR support autonomous cell balancing, and how is it implemented?

Yes, the BQ7694202PFBR supports autonomous passive cell balancing without host processor involvement. Balancing is triggered based on user-configurable voltage thresholds and executed through dedicated balance current paths routed via VC0–VC10 pins. Each cell can be balanced independently at up to 100 mA, and timing/control logic resides entirely within the IC-enabling balancing during charging, rest, or even DEEPSLEEP mode when wake sources are active.

What protection features are integrated into the BQ7694202PFBR?

The BQ7694202PFBR integrates a comprehensive protection suite including overvoltage/undervoltage per cell, overtemperature (via internal sensor and up to nine external thermistors), overcurrent (charge/discharge), short-circuit, and internal diagnostics (open-wire, ADC fault, memory CRC). Protection responses are configurable as latched or auto-recoverable, and the device supports both primary (fast, hardware-based) and secondary (software-configurable) protection layers-meeting functional safety requirements for UL 2580 and IEC 62133 compliance.