Texas Instruments BQ29732DSET

Overview

BQ29732DSET from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that integrates overvoltage (4.280 V), undervoltage (2.500 V), charge/discharge overcurrent (–0.100 V / 0.190 V), and short-circuit (0.5 V) detection with factory-programmed thresholds and fixed delay timers. It drives external CHG/DSG FETs and supports zero-voltage charging for deeply depleted cells in portable power systems.

For engineers reviewing the BQ29732DSET datasheet, BQ29732DSET pinout, BQ29732DSET application, or BQ29732DSET equivalent, this device delivers precision ±10 mV OVP/UVP accuracy at 25°C, 4 µA NORMAL-mode current, and WSON-6 (1.50 mm × 1.50 mm) packaging optimized for space-constrained battery packs in handheld electronics.

Technical Context

The BQ29732DSET implements analog voltage sensing across external FETs to detect overcurrent conditions via differential V_DS measurement on V– and VSS pins, with ±10 mV typical accuracy at 25°C and ±15 mV over –40°C to +85°C. Its internal oscillator governs all fault timing functions, including fixed 250 µs short-circuit detection delay and programmable delays for OVP (1.25 s), UVP (144 ms), OCC (8 ms), and OCD (8 ms).

Operation occurs in two low-power states: NORMAL mode draws 4 µA at 3.8 V BAT, while shutdown consumes ≤0.1 µA. The device uses factory-trimmed thresholds-no external resistors or configuration pins-and relies on dedicated COUT/DOUT outputs to directly drive NMOS gate terminals of external charge and discharge FETs.

Key Specifications

Pinout & Package

Package: WSON-6 (DSE), 1.50 mm × 1.50 mm × 0.75 mm body, wettable flank terminations, no exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29732DSET, BQ29733DSET offers higher overvoltage headroom and faster undervoltage response, while BQ29728DSET provides elevated undervoltage protection without altering timing-enabling precise tailoring of safety margins for specific cell chemistries and load profiles.

Availability

BQ29732DSET is available at Aetrix Electronics and suitable for mobile handsets, tablet PCs, and handheld data terminals requiring stable component supply, long-term lifecycle support, and consistent factory-programmed protection parameters.

Supply support for BQ29732DSET 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 over 50 years of innovation in battery management solutions.

The BQ297xx family is designed specifically for cost-sensitive, space-constrained single-cell Li-ion/Li-polymer battery packs in consumer electronics, delivering integrated voltage/current protection with zero external passive components.

FAQ

What is the overcharge detection voltage threshold for BQ29732DSET?

The BQ29732DSET has a factory-programmed overcharge detection voltage (VOVP) of 4.280 V with ±10 mV accuracy at 25°C. This threshold is laser-trimmed and fixed-no external adjustment is possible. The device triggers COUT low after a 1.25-second delay when BAT-to-VSS voltage exceeds this value, protecting the cell from overcharging during constant-voltage charging phases.

Does BQ29732DSET support zero-voltage charging, and what is the activation threshold?

Yes, BQ29732DSET supports zero-voltage charging to recover deeply depleted cells. Charging is enabled when the voltage between BAT and V– reaches ≥1.7 V, and inhibited below 0.75 V. This function operates autonomously without MCU control and is verified across the full –40°C to +85°C temperature range per TI's characterization data.

What package type and dimensions does BQ29732DSET use?

BQ29732DSET uses the WSON-6 (DSE) package: 1.50 mm × 1.50 mm × 0.75 mm body size with wettable flank leads. It is a leadless, near-chip-scale package with six terminals-BAT, COUT, DOUT, VSS, V–, and NC-designed for high-density PCB layouts in portable devices.

How does BQ29732DSET detect discharge overcurrent without a sense resistor?

BQ29732DSET measures the voltage drop (V_DS) across the external discharge FET using the V– and VSS pins. With a factory-set OCD threshold of 0.190 V ±10 mV, it detects excessive discharge current by sensing this differential voltage-eliminating the need for a discrete current-sense resistor and associated board area and power loss.

What are the key timing parameters for fault recovery in BQ29732DSET?

After a fault is cleared, BQ29732DSET applies fixed recovery delays: 12 ms for overcharge (OVP) and 8 ms for over-discharge (UVP), charge overcurrent (OCC), discharge overcurrent (OCD), and short-circuit (SCD). These intervals begin once the measured voltage/current returns within safe limits and ensure stable re-enabling of CHG/DSG FETs.