Texas Instruments BQ7694001DBT

Overview

BQ7694001DBT from Texas Instruments is a 9–15-series Li-ion/LiFePO₄ battery monitor AFE with integrated cell balancing FETs, dual low-side N-channel FET drivers (CHG/DSG), and I²C-compatible digital interface featuring CRC option. It measures up to 15 cell voltages, pack current via coulomb counter, die temperature, and three external thermistors (103AT), supporting 48-V industrial battery packs in UPS and e-bikes.

For engineers reviewing the BQ7694001DBT datasheet, BQ7694001DBT pinout, BQ7694001DBT application, or BQ7694001DBT equivalent, key selection criteria include its 44-pin TSSOP package, 5 mA per-cell balancing current, ±25 mV cell voltage accuracy over –40°C to +85°C, hardware-based OV/UV/OCD/SCD protection, and support for random cell connection topology without reconfiguration.

Technical Context

The BQ7694001DBT implements a multi-rail analog front-end with dedicated ADCs: one 14-bit ADC for cell voltage and temperature sensing (382 µV LSB), and a separate 16-bit coulomb counter ADC (8.44 µV LSB) with ±200 mV input range. Its protection logic executes autonomous hardware-triggered responses-including configurable OV/UV delay (1–8 s), OCD/SCD thresholds (8–200 mV), and thermal shutdown at 100–150°C-without host intervention.

It supports hierarchical voltage referencing across three domains (VSS, VC5X, VC10X) to accommodate up to 15-series stacks, enabling direct sensing of differential cell voltages (VCn–VCn−1) up to 9 V while maintaining ±0.3 µA input bias on non-reference sense pins. The device operates from 6 V to 48 V supply (BAT–VSS), with ultra-low 0.6–1.8 µA SHIP mode current and programmable wake-up via TS1 boot signal.

Key Specifications

Pinout & Package

Package: 44-pin TSSOP (DBT), 11.00 mm × 4.40 mm × 1.20 mm body size, lead pitch 0.65 mm. RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ7694001DBT, BQ7694000DBT offers identical monitoring capability but lacks CRC and 3.3-V regulation, while MAX17853 trades I²C simplicity for daisy-chain robustness and safety certification-making BQ7694001DBT optimal for industrial 48-V systems prioritizing ease of integration and thermal reliability.

Availability

BQ7694001DBT is available at Aetrix Electronics and suitable for e-bike battery management, energy storage systems, and uninterruptible power supplies requiring stable component supply, long-lifecycle support, and factory-programmed configuration consistency.

Supply support for BQ7694001DBT 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 and embedded processing technologies, with decades of expertise in battery management ICs and high-reliability power solutions.

The BQ769x0 product line was designed specifically for high-power, multi-cell Li-ion and LiFePO₄ battery packs in light electric vehicles, power tools, and stationary energy storage-emphasizing hardware autonomy, ultra-low power, and simplified system integration.

FAQ

What is the maximum number of series-connected cells supported by the BQ7694001DBT?

The BQ7694001DBT supports up to 15 series-connected cells, covering battery configurations from 9S to 15S. This enables direct monitoring of 48-V nominal Li-ion or LiFePO₄ packs without external multiplexing or voltage dividers. Its hierarchical sensing architecture (VSS/VC5X/VC10X references) ensures accurate differential measurements across the full stack, as confirmed in the device's Absolute Maximum Ratings and Recommended Operating Conditions tables.

Does the BQ7694001DBT require external EEPROM programming for configuration?

No, the BQ7694001DBT does not require external EEPROM programming. Texas Instruments preconfigures the device with fixed settings including I²C address (0x08), LDO output voltage (3.3 V), and CRC enablement-permanently stored in on-chip memory. This eliminates startup configuration overhead and ensures consistent behavior across units, as documented in the Device Comparison Table and Section 5 of the datasheet.

What is the cell voltage measurement accuracy of the BQ7694001DBT over temperature?

The BQ7694001DBT provides ±25 mV cell voltage accuracy across the full operating temperature range of –40°C to +85°C for input voltages between 2.0 V and 5.0 V. At 25°C, accuracy improves to ±10 mV for 3.6–4.3 V, and ±15 mV for 3.2–4.6 V. These values are specified in Section 7.5 Electrical Characteristics and reflect total error including offset, gain, and drift components.

How does the BQ7694001DBT handle thermistor inputs for multi-zone thermal monitoring?

The BQ7694001DBT supports three independent thermistor inputs (TS1, TS2, TS3), each with dedicated bias and ground reference: TS1 referenced to VSS, TS2 to VC5X, and TS3 to VC10X. This allows simultaneous monitoring of distinct thermal zones-such as top/middle/bottom of a 15S pack-using standard 103AT NTC thermistors. Pull-up resistance is factory-trimmed to 9.85–10.15 kΩ at 25°C, as specified in the Electrical Characteristics table.

What protection features are implemented in hardware versus firmware on the BQ7694001DBT?

The BQ7694001DBT implements OV, UV, OCD, and SCD protections entirely in hardware, with autonomous response times as fast as 35 µs (SCD) and no dependency on host MCU execution. Secondary protector fault detection and thermal shutdown (100–150°C) are also hardware-enforced. Firmware is only required for non-critical functions like balancing scheduling, SOC calculation, and alert logging-ensuring fail-safe operation even during host failure.