Texas Instruments BQ29707DSET

Overview

BQ29707DSET from Texas Instruments is a single-cell Li-ion/Li-polymer battery protection IC that integrates overvoltage (4.280 V), undervoltage (2.800 V), charge/discharge overcurrent (–0.090 V / 0.090 V), and short-circuit (0.3 V) detection with factory-programmed thresholds and fixed timing delays (1 s OVP, 96 ms UVP, 16 ms OCD, 6 ms OCC, 250 µs SCP). It operates from –40°C to +85°C with 4 µA normal-mode current and drives external CHG/DSG FETs via COUT/DOUT outputs in a 1.50 mm × 1.50 mm WSON package.

For engineers reviewing the BQ29707DSET datasheet, BQ29707DSET pinout, BQ29707DSET application, or BQ29707DSET equivalent, this device delivers precision cell-level fault monitoring for compact portable power systems where low quiescent current, zero-voltage charging capability (≥1.7 V), and ±5 mV OCP sensing accuracy are critical selection criteria.

Technical Context

The BQ29707DSET implements analog voltage and differential current sensing across external FETs using V– and VSS inputs to detect overcharge, over-discharge, and load faults without requiring a microcontroller. Its internal oscillator governs all fault timers, and recovery behavior follows fixed hysteresis (e.g., 12 ms OVP release, 8 ms UVP/OCD/OCC release).

It operates in two primary modes: NORMAL (4 µA ICC) for active monitoring and Shutdown (100 nA IQ) for ultra-low-power storage. Fault responses are hardwired-COUT pulls low on OCC/SCP, DOUT pulls low on UVP/OCD-and no I²C or configuration interface is present.

Key Specifications

Pinout & Package

Package: 6-pin WSON (DSE), 1.50 mm × 1.50 mm × 0.75 mm body size, wettable flank option not specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29707DSET, BQ29706DSET offers lower OVP and longer UVP delay for robustness in low-voltage systems, while BQ29733DSET provides higher OVP accuracy and sub-25 ms UVP response for premium energy-dense cells-neither is pin-compatible, but all share identical WSON-6 packaging and functional architecture.

Availability

BQ29707DSET is available at Aetrix Electronics and suitable for smartphone battery packs, tablet secondary protection circuits, and handheld data terminal power management systems requiring stable component supply and guaranteed long-term manufacturability.

Supply support for BQ29707DSET 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 requiring autonomous, low-power, factory-configured protection without microcontroller dependency.

FAQ

What protection functions does the BQ29707DSET provide?

The BQ29707DSET provides overcharge protection (OVP at 4.280 V), over-discharge protection (UVP at 2.800 V), charge overcurrent protection (OCC at –90 mV), discharge overcurrent protection (OCD at 90 mV), and load short-circuit protection (SCP at 0.3 V). All thresholds are factory-programmed, and each fault triggers dedicated gate-drive outputs (COUT/DOUT) to disable external FETs with fixed timing delays. The BQ29707DSET performs these functions autonomously without firmware or communication interface.

Does the BQ29707DSET support zero-voltage charging?

Yes, the BQ29707DSET supports zero-voltage charging: it allows charging of fully depleted batteries when the charger voltage applied to the BAT pin is ≥1.7 V. This feature enables automatic recovery of deeply discharged cells without external pre-charge circuitry. The BQ29707DSET inhibits charging only if the battery voltage falls below 0.75 V, as defined by its V0INH threshold. This behavior is intrinsic to the BQ29707DSET silicon design and requires no configuration.

What is the operating temperature range of the BQ29707DSET?

The BQ29707DSET is rated for operation from –40°C to +85°C ambient temperature. Its protection thresholds and timing parameters are characterized across this full range, with specified accuracy tolerances (e.g., ±20 mV OVP error from 0°C to 60°C). The device maintains 4 µA typical supply current within this range and uses an internal oscillator whose frequency drift is compensated to ensure consistent fault timing. This makes the BQ29707DSET suitable for consumer and industrial portable equipment exposed to real-world environmental extremes.

How does the BQ29707DSET sense overcurrent conditions?

The BQ29707DSET senses overcurrent by measuring differential voltage across external FETs: V_DS during discharge (between V– and VSS) and reverse V_DS during charge (between VSS and V–). It achieves ±5 mV typical sensing accuracy using matched internal amplifiers. For discharge overcurrent, the BQ29707DSET triggers DOUT low when V– – VSS exceeds 90 mV for 16 ms; for charge overcurrent, it triggers COUT low when VSS – V– exceeds 90 mV for 6 ms. No external sense resistor is required-the FET's R_DS(on) serves as the current-sensing element.

What package type and dimensions does the BQ29707DSET use?

The BQ29707DSET uses a 6-pin WSON package designated DSE, with nominal body dimensions of 1.50 mm × 1.50 mm × 0.75 mm. It features a bottom-exposed thermal pad for enhanced heat dissipation and is compatible with standard SMT reflow processes. Pin 1 is NC (no connection), pins 2 and 3 are COUT and DOUT outputs, pin 4 is VSS, pin 5 is BAT, and pin 6 is V–. This compact footprint enables integration into ultra-thin battery packs where board area is severely constrained-exactly as required by modern BQ29707DSET deployments.