Texas Instruments BQ7694203PFBR

Overview

BQ7694203PFBR 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, autonomous or host-controlled cell balancing, and high-side NFET charge-pump drivers. It serves as the core protection and telemetry controller in cordless power tools and e-bike battery management systems.

For engineers reviewing the BQ7694203PFBR datasheet, BQ7694203PFBR pinout, BQ7694203PFBR application, or BQ7694203PFBR equivalent, key selection criteria include its SPI interface with CRC enabled, 5-V REG1 LDO default setting, 48-pin TQFP (PFB) package, 85-V high-voltage tolerance on cell inputs, and support for up to nine external thermistors with internal diagnostics.

Technical Context

The BQ7694203PFBR implements two independent ADCs: one dedicated to high-accuracy coulomb counting (<1 µV input offset) and another for synchronized cell voltage acquisition (<10 mV error). Its protection subsystem includes configurable overvoltage, undervoltage, overtemperature, and overcurrent thresholds with both primary and secondary response layers.

It supports three low-power operating modes-SLEEP (24–41 µA), DEEPSLEEP (9–10 µA), and SHUTDOWN (1 µA)-and features integrated OTP memory programmable during production. The device uses a charge pump to drive high-side NFETs and provides dual programmable LDOs (REG1 defaults to 5 V, REG2 configurable from 1.8 V to 5.0 V).

Key Specifications

Pinout & Package

48-pin TQFP package (PFB), 7 mm × 7 mm body size, exposed thermal pad (not electrically connected), RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ7694202PFBR and BQ7695203PFBR, the BQ7694203PFBR offers optimal balance of SPI robustness, 5-V LDO capability, and cost-effective 85°C operation-making it ideal for high-volume consumer and industrial battery packs where I²C bandwidth or automotive qualification are unnecessary.

Availability

BQ7694203PFBR is available at Aetrix Electronics and suitable for cordless power tools, e-bikes, and vacuum cleaner battery packs requiring stable component supply, production-ready OTP programming support, and long-term lifecycle assurance.

Supply support for BQ7694203PFBR 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 innovation.

The BQ76942 product line delivers highly integrated, high-accuracy battery monitors for 3- to 10-series lithium-based packs-designed specifically for industrial, mobility, and cordless applications demanding autonomous protection and precision telemetry.

FAQ

What communication interface does the BQ7694203PFBR use, and how is it configured?

The BQ7694203PFBR uses SPI with CRC enabled as its primary communication interface. Unlike other variants in the family, this part has CRC validation activated by default and supports clock speeds up to 400 kHz. Configuration is performed via registers or one-time-programmable (OTP) memory, and the device supports multifunction pins (e.g., SCL/SDA/CFETOFF/DFETOFF) to implement full SPI signaling without requiring additional GPIOs. This makes the BQ7694203PFBR especially suitable for noise-sensitive motor-driven applications where SPI's deterministic timing outperforms I²C.

How does the BQ7694203PFBR handle cell voltage measurement accuracy across temperature?

The BQ7694203PFBR achieves ±10 mV cell voltage measurement accuracy from 0°C to 60°C and ±15 mV from –40°C to 85°C, after board-level offset calibration. This specification applies to all 10 cell inputs (VC0–VC10) under recommended operating conditions (VBAT = 4.7 V to 55 V). The device includes factory-trimmed voltage ADC references and supports user calibration routines for COV/CUV protections, ensuring consistent protection thresholds across environmental stress. These values are confirmed in Section 7.3 of the official datasheet and validated across production lots.

What is the default output voltage of the REG1 LDO on the BQ7694203PFBR, and can it be changed?

The REG1 LDO on the BQ7694203PFBR defaults to 5.0 V output, distinguishing it from other variants like BQ7694202 (3.3 V default) or base BQ76942 (disabled). REG1 is programmable to 1.8 V, 2.5 V, 3.0 V, 3.3 V, or 5.0 V via configuration registers or OTP memory. This flexibility allows the BQ7694203PFBR to directly power 5-V microcontrollers, display drivers, or sensor interfaces without external regulators-reducing BOM count and PCB area in space-constrained battery packs.

Does the BQ7694203PFBR support autonomous cell balancing, and what is the maximum balancing current?

Yes, the BQ7694203PFBR supports both autonomous and host-controlled cell balancing. Autonomous balancing operates without MCU intervention using internal timers and voltage thresholds. The maximum balancing current through any single cell is 100 mA, as specified in the Absolute Maximum Ratings table. Balancing is implemented via dedicated current paths between adjacent cells (e.g., VC0–VC1, VC1–VC2, etc.), and the device supports balancing during charge, discharge, or rest states-critical for maintaining long-term pack health in applications like e-bikes and power tools.

What power modes does the BQ7694203PFBR support, and what are their typical current draws?

The BQ7694203PFBR supports four operational power modes: NORMAL (286 µA typical), multiple SLEEP options (24–41 µA), multiple DEEPSLEEP options (9–10 µA), and SHUTDOWN (1 µA). SLEEP mode retains RAM and register state while disabling ADC conversions; DEEPSLEEP further disables clocks and LDOs except for wakeup-capable pins (e.g., TS2, LD); SHUTDOWN cuts nearly all internal circuitry. These modes are selected via command or configuration bits and enable ultra-low-power monitoring in battery-powered equipment with multi-week shelf life requirements.