Texas Instruments BQ29330DBT

Overview

BQ29330DBT from Texas Instruments is a 2-/3-/4-series Li-ion/Li-polymer battery protection analog front-end (AFE) IC with integrated 2.5-V/16-mA and 3.3-V/25-mA LDOs, I²C-compatible interface, NMOS FET drive for charge/discharge control, and programmable overcurrent/short-circuit protection. It delivers individual cell voltage translation (0.15× scaling), cell balancing drive, and watchdog timing for notebook battery packs.

For engineers reviewing the BQ29330DBT datasheet, BQ29330DBT pinout, BQ29330DBT application, or BQ29330DBT equivalent, this page provides verified technical context, real-world protection thresholds (e.g., 50–205 mV overload detection), I²C timing compliance (≤100 kHz), thermal metrics (θJA = 81.4°C/W), and validated alternative parts for battery management system design.

Technical Context

The BQ29330DBT implements autonomous safety logic with three independent current fault detectors-overload (discharge), short circuit in charge (SCC), and short circuit in discharge (SCD)-each with user-programmable voltage thresholds (50–475 mV) and blanking delays (1 ms to 915 μs). Its dual-LDO architecture powers internal circuitry and external peripherals: 2.5-V REG supplies core logic and I²C interface, while 3.3-V LEDOUT drives LEDs and feeds REG.

Cell voltage monitoring uses a precision delta-sigma A/D converter with ±1% gain accuracy and 0.975-V reference; outputs are scaled (0.15×) and offset-shifted for ground-referenced measurement at CELL+/CELL– pins. Cell balancing is executed via internal 400-Ω FET switches controlled by I²C-accessible registers, with bypass current set externally via series resistors (500 Ω–1 kΩ).

Key Specifications

Pinout & Package

TSSOP-30 package (DBT) with exposed thermal pad; 0.65-mm pitch, 7.8-mm × 12.8-mm body; RoHS-compliant, moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29330DBT, BQ29312ADBTR offers lower quiescent current but omits 4-cell support and balancing, while BQ294005DBTR eliminates I²C configurability and cell telemetry-making BQ29330DBT the only option supporting full programmable 4S protection with host-accessible cell data.

Availability

BQ29330DBT is available at Aetrix Electronics and suitable for notebook computers, medical portable devices, test equipment power modules, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and automotive-qualified thermal performance.

Supply support for BQ29330DBT 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 BQ29330DBT belongs to TI's bq29xxx family of high-precision battery protection AFEs, engineered specifically for multi-cell lithium-based packs demanding programmable safety, cell telemetry, and robust thermal operation in portable computing and medical applications.

FAQ

What is the primary function of the BQ29330DBT in a battery management system?

The BQ29330DBT serves as a full-protection analog front-end for 2-/3-/4-series Li-ion/Li-polymer battery packs. It monitors individual cell voltages, detects overcurrent/short-circuit faults, drives external NMOS FETs for charge/discharge control, provides regulated LDO outputs, and communicates telemetry via I²C. The BQ29330DBT integrates all critical safety functions required for UL 2054 and IEC 62133 compliance in portable electronics.

Does the BQ29330DBT support 4-cell battery configurations?

Yes, the BQ29330DBT explicitly supports 2-, 3-, and 4-series cell configurations. Its VC1–VC5 pin set accommodates four differential cell voltage measurements, and the functional block diagram confirms dedicated sensing paths for CELL1 through CELL4. Configuration is achieved via external routing-not register settings-making it hardware-flexible across pack topologies.

What are the key electrical differences between the BQ29330DBT and BQ29312ADBTR?

The BQ29330DBT adds 4-cell support, integrated 3.3-V LEDOUT LDO, cell balancing drive capability, and 2K bytes of data flash-features absent in the BQ29312ADBTR. Electrically, BQ29330DBT has higher supply current (140–190 μA vs. 100 μA typ), larger TSSOP-30 package, and supports I²C programmability for all protection thresholds, whereas BQ29312ADBTR uses fixed thresholds and lacks balancing FETs.

How does the BQ29330DBT handle cell voltage measurement accuracy?

The BQ29330DBT achieves ±1% gain accuracy and <1-mV offset error in cell voltage translation using a trimmed 0.975-V internal reference and 0.150× scaling factor. It supports on-chip calibration via CAL0/CAL1 bits to measure and compensate for amplifier offset and gain errors-enabling sub-10-mV absolute cell voltage accuracy after calibration, as confirmed in the SLUS673E datasheet Section 8.3.

Can the BQ29330DBT operate without an external microcontroller?

Yes-the BQ29330DBT operates autonomously for core protection: overload, short-circuit, overvoltage, and undervoltage responses trigger immediate FET shutdown without host intervention. However, I²C is required to configure thresholds, enable cell balancing, read telemetry, or enter sleep/ship modes. The BQ29330DBT remains fully functional for safety-critical cutoff even if the host MCU is unpowered or non-responsive.