Texas Instruments BQ7694000DBTR

Overview

BQ7694000DBTR from Texas Instruments is a 9–15-series Li-ion/LiFePO₄ battery monitor AFE with integrated cell balancing FETs, low-side charge/discharge drivers, and dual 14-bit/16-bit ADCs for voltage, temperature, and coulomb counting. It supports up to three thermistors (103AT), delivers 2.5-V LDO output, and operates up to 108 V absolute max supply - enabling use in 48-V e-bike and energy storage systems.

For engineers reviewing the BQ7694000DBTR datasheet, BQ7694000DBTR pinout, BQ7694000DBTR application, or BQ7694000DBTR equivalent, key selection criteria include its 44-pin TSSOP package, 9–15-cell monitoring range, hardware-based OV/UV/OCD/SCD protection, I²C interface with CRC option, and random cell connection tolerance - all critical for high-reliability pack-level BMS design.

Technical Context

The BQ7694000DBTR implements a multi-rail sensing architecture with segmented voltage domains (VC0–VC5, VC5x–VC10, VC10x–VC15) to support up to 15-series cells while maintaining ±25 mV cell voltage accuracy (–40°C to +85°C) and ±40 LSB coulomb counter INL. Its dual ADC subsystem enables concurrent cell voltage (14-bit, 382 µV LSB) and pack current (16-bit, 8.44 µV LSB) measurement at 250-ms intervals.

Hardware protection logic executes independently of host control: OV/UV thresholds are programmable in 16-LSB steps across full ADC range; OCD/SCD detection uses configurable delay timers (8 ms–1280 ms and 35 µs–520 µs respectively) with ±2.5 mV offset compensation; and thermal shutdown triggers at 100–150°C. The device enters SHIP mode with 0.6–1.8 µA quiescent current.

Key Specifications

Pinout & Package

Package: 44-pin TSSOP (DBT), 11.00 mm × 4.40 mm × 1.20 mm body size, with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ7693000DBTR and MAX17853GCM+, the BQ7694000DBTR uniquely combines 15-cell scalability, on-chip balancing, and 44-TSSOP thermal performance - making it optimal for cost-sensitive, high-string-count industrial battery systems where layout simplicity and supply chain continuity matter.

Availability

BQ7694000DBTR is available at Aetrix Electronics and suitable for light electric vehicles, energy storage systems, and uninterruptible power supplies requiring stable component supply across multi-year production cycles.

Supply support for BQ7694000DBTR 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, high-string-count battery packs in light electric vehicles and industrial energy storage - prioritizing hardware autonomy, ultra-low quiescent current, and simplified system-level integration.

FAQ

What is the maximum number of series-connected cells supported by the BQ7694000DBTR?

The BQ7694000DBTR supports up to 15 series-connected cells, covering nominal battery voltages from 42 V (12S LiFePO₄) to 48 V (12S NMC) and beyond. This is enabled by its three-tiered voltage sensing architecture (VC0–VC5, VC5x–VC10, VC10x–VC15), which maintains signal integrity and accuracy across extended voltage ranges without external level shifters. The BQ7694000DBTR datasheet explicitly specifies "9–15 series cells" as its operational range.

Does the BQ7694000DBTR include integrated cell balancing capability?

Yes, the BQ7694000DBTR integrates internal cell balancing FETs delivering up to 5 mA per cell. This eliminates the need for external balancing transistors and associated gate-drive circuitry, reducing BOM count and PCB area. Balancing is controlled entirely through register writes over I²C, with configurable on/off states and timing - confirmed in Section 1 Features and Table 7-5 of the official BQ7694000DBTR datasheet.

What protection functions are implemented in hardware on the BQ7694000DBTR?

The BQ7694000DBTR implements five hardware-based protections without host MCU involvement: Overvoltage (OV), Undervoltage (UV), Overcurrent in Discharge (OCD), Short Circuit in Discharge (SCD), and secondary protector fault detection. Each has programmable thresholds and delay timers - for example, OCD response ranges from 8 ms to 1280 ms, and SCD triggers in as little as 35 µs. These are documented in Section 1 Features and Section 7.5 Electrical Characteristics.

Can the BQ7694000DBTR operate with different LDO output voltages?

No - the BQ7694000DBTR is factory-configured for a fixed 2.5-V REGOUT output. While the BQ76940 family includes variants like BQ7694002DBTR (3.3 V) and BQ7694006DBTR (I²C address 0x18), the BQ7694000DBTR specifically ships with 2.5-V LDO and cannot be reconfigured. This is stated in the Device Comparison Table (Section 5) and confirmed in ordering information on TI's product page.

What is the purpose of the VC5x and VC10x pins on the BQ7694000DBTR?

The VC5x and VC10x pins serve as reference nodes for segmented voltage domain measurement: VC5x acts as the local ground for cells VC6–VC10, and VC10x serves the same role for VC11–VC15. This architecture limits differential voltage stress across internal front-end circuitry to ≤10 V per domain - enabling safe, accurate monitoring of up to 15-series stacks while maintaining 14-bit ADC precision. Their function is defined in Section 6.4 Pin Configuration and Figure 6-4.