Texas Instruments BQ296907DSGR

Overview

BQ296907DSGR from Texas Instruments is a factory-programmed, high-accuracy overvoltage protection IC for 2–4 series Li-ion/LiFePO₄ battery packs, featuring ±12 mV OVP threshold accuracy at 4.65 V, 6.5 s fixed delay timer, active-high output drive, and 1.5 V/3 mA regulated supply output. It operates in NORMAL mode at 1.23 µA supply current and maintains OVP detection even during undervoltage conditions.

For engineers reviewing the BQ296907DSGR datasheet, BQ296907DSGR pinout, BQ296907DSGR application, or BQ296907DSGR equivalent, this device supports critical second-level cell voltage monitoring, RTC power delivery, and fuse-blow control in space-constrained portable systems requiring ultra-low quiescent current and factory-trimmed precision.

Technical Context

The BQ296907DSGR implements independent per-cell voltage sensing across four differential inputs (V1–VSS to V4–V3), compares each against a factory-set 4.65 V overvoltage threshold with 300 mV hysteresis, and triggers an active-high OUT signal after a fixed 6.5 s delay. Its integrated regulator delivers stable 1.5 V at up to 3 mA while self-disabling when any cell falls below the factory-programmed 2.5 V undervoltage threshold.

In NORMAL mode (all cells between 2.5 V and 4.65 V), it draws only 1.23 µA; under undervoltage (any cell < 2.5 V), current drops to 0.25 µA while retaining full OVP monitoring capability - enabling reliable fault detection in imbalanced packs without regulator load.

Key Specifications

Pinout & Package

Package: 8-pin WSON (2.0 mm × 2.0 mm), thermally enhanced with exposed pad (PWPD) tied to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ296907DSGR, BQ296107DSGR offers identical OVP timing and regulation but omits UV-based REG disable - making it unsuitable for deep-discharge-sensitive applications - while MP26123DJ-LF-Z integrates charging functionality at the cost of higher I_Q, no programmable REG voltage, and reduced OVP precision.

Availability

BQ296907DSGR is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power subsystems, and portable medical electronics requiring stable component supply, factory-trimmed voltage thresholds, and ultra-low quiescent current operation.

Supply support for BQ296907DSGR 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 experience in battery safety ICs.

The BQ2969 family targets high-reliability, second-level overvoltage protection in multi-cell Li-ion and LiFePO₄ battery packs, emphasizing precision, ultra-low power, and integrated regulated supply for always-on system functions.

FAQ

What is the factory-programmed overvoltage threshold for BQ296907DSGR?

The BQ296907DSGR has a factory-programmed overvoltage threshold of 4.65 V with ±12 mV accuracy at 25°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The device uses this fixed threshold to monitor each cell in 2–4 series configurations and trigger the OUT pin after the programmed 6.5 s delay. BQ296907DSGR maintains this specification across –40°C to +110°C with defined drift limits.

Does BQ296907DSGR retain overvoltage detection capability when the battery pack is in undervoltage state?

Yes, BQ296907DSGR retains full overvoltage detection capability even when any cell falls below its factory-programmed 2.5 V undervoltage threshold. In that condition, the REG output is disabled to prevent further discharge, but the internal OVP comparators and delay timer remain fully operational. This allows BQ296907DSGR to detect and respond to overvoltage on other cells - a critical feature for identifying imbalance faults in partially discharged packs.

What is the purpose and configuration requirement of the REG pin on BQ296907DSGR?

The REG pin on BQ296907DSGR delivers a factory-programmed 1.5 V regulated output capable of sourcing up to 3 mA. It is designed to power always-on circuits such as RTC oscillators or supervisor ICs without requiring an external LDO. A 0.47 µF ceramic capacitor must be placed directly between REG and VSS for stability, noise immunity, and ESD robustness. BQ296907DSGR disables REG automatically when any cell voltage drops below 2.5 V for 6.5 s.

How does the OUT pin of BQ296907DSGR behave during overvoltage events?

The OUT pin of BQ296907DSGR is configured as active-high and transitions to logic high after a fixed 6.5 s delay following detection of any cell exceeding 4.65 V. It remains asserted until all cell voltages fall below 4.35 V (4.65 V – 300 mV hysteresis). BQ296907DSGR does not latch the output - recovery is automatic upon valid voltage restoration. The pin can source up to 5.2 mA and is intended to drive the gate of an external NMOS FET controlling a high-side fuse.

What package type and thermal characteristics apply to BQ296907DSGR?

BQ296907DSGR is packaged in an 8-pin WSON (DSG) measuring 2.0 mm × 2.0 mm with an exposed thermal pad (PWPD). Its junction-to-board thermal resistance (RθJB) is 46.5°C/W, and junction-to-ambient (RθJA) is 80.0°C/W. The exposed pad must be soldered to a VSS copper plane for optimal thermal performance and reliability. This compact, thermally efficient package supports high-density battery pack layouts and meets IPC-7351B footprint standards.