Texas Instruments BQ296202DSGT

Overview

BQ296202DSGT from Texas Instruments is a high-accuracy, low-power overvoltage protector IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.45V OVP threshold, 6.5s fixed delay timer, ±10mV OVP accuracy, 3.3V regulated output (2mA max), and 8-pin WSON (2mm × 2mm) package. It monitors each cell independently and drives external FETs to blow fuses during overvoltage faults in notebook PC battery packs.

For engineers reviewing the BQ296202DSGT datasheet, BQ296202DSGT pinout, BQ296202DSGT application, or BQ296202DSGT equivalent, this page delivers verified technical context, real-world implementation constraints, confirmed pin functions, and validated alternative options for second-level battery protection design.

Technical Context

The BQ296202DSGT implements independent per-cell voltage monitoring across up to four series-connected Li-ion cells using precision analog comparators referenced to a factory-trimmed 4.45V overvoltage threshold. An internal fixed-delay timer (6.5s) triggers the CMOS-active-high OUT signal only after sustained overvoltage detection on any cell.

Its integrated 3.3V regulated supply delivers up to 2mA with self-disable logic that turns off REG when any cell voltage falls below the factory-set 2.5V undervoltage threshold - preventing battery drain while powering always-on circuits like RTCs. Input leakage per cell sense pin remains under 100nA across –40°C to +110°C.

Key Specifications

Pinout & Package

Package: 8-pin WSON (2.00mm × 2.00mm), exposed thermal pad (PWPD) recommended to be connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ296202DSGT, BQ296203DSGT offers a +50mV OVP offset for improved margin against voltage transients, while BQ296231DSGT extends the upper limit to 4.60V for next-generation high-voltage cells - both retain identical 6.5s delay, 3.3V REG, and low-leakage performance.

Availability

BQ296202DSGT is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable devices, and UPS backup systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.

Supply support for BQ296202DSGT 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 BQ296xxx family is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision voltage monitoring, regulated supply generation, and robust fault signaling in ultra-small packages.

FAQ

What is the exact overvoltage protection threshold and accuracy of BQ296202DSGT?

The BQ296202DSGT has a factory-programmed overvoltage protection threshold of 4.45V with ±10mV accuracy at 25°C and ±54mV accuracy across –40°C to +110°C. This value is laser-trimmed during manufacturing and cannot be adjusted externally. The BQ296202DSGT uses internal precision references and matched comparator circuitry to maintain this specification without external calibration components.

Does BQ296202DSGT support 2-series, 3-series, and 4-series Li-ion configurations?

Yes, the BQ296202DSGT supports 2S, 3S, and 4S Li-ion battery stacks via its four independent cell sense inputs (V1–V4). Unused inputs are shorted to the adjacent lower pin (e.g., V4 to V3 in 3S configuration). The device automatically adapts monitoring range and fault logic regardless of stack size, and all electrical specifications - including OVP accuracy and leakage - apply identically across supported configurations.

How does the regulated output (REG) of BQ296202DSGT behave during battery discharge?

The BQ296202DSGT's REG pin delivers a stable 3.3V output up to 2mA, but self-disables when any monitored cell voltage falls below the factory-set 2.5V undervoltage threshold for 4.5–7.5 seconds. Once all cells rise above 2.5V + 300mV hysteresis, REG re-enables automatically. This behavior prevents excessive discharge and protects downstream circuits like RTCs from brownout conditions.

What is the purpose of the PWPD pin on BQ296202DSGT, and how should it be connected?

The PWPD pin on BQ296202DSGT is the exposed thermal pad of the 8-pin WSON package and must be electrically connected to VSS (ground) on the PCB for optimal thermal performance and ESD robustness. TI recommends soldering the pad fully to a VSS copper pour with multiple thermal vias. Leaving PWPD unconnected degrades thermal resistance by >40% and increases junction temperature, potentially affecting long-term reliability and OVP accuracy.

Can BQ296202DSGT be used without external RC filters on the Vx pins?

No - external RC filters are mandatory for stable operation of BQ296202DSGT. Each Vx pin requires a 1kΩ resistor and 0.1µF capacitor (per TI-recommended values) to suppress high-frequency noise and prevent false OVP triggering. Using different RIN values alters the effective OVP threshold due to input bias current interaction; omitting filters risks erratic behavior, especially in noisy switching environments like notebook chargers or motor-driven UPS systems.