Texas Instruments BQ296229DSGR

Overview

BQ296229DSGR from Texas Instruments is a high-accuracy, low-power overvoltage protection IC for 2–4 series Li-ion battery packs, featuring factory-programmed 4.60 V OVP threshold, 6.5 s fixed delay timer, ±10 mV OVP accuracy, active-high OUT signal, and 3.0 V regulated output supply delivering up to 2 mA. It is used in notebook PC battery packs to safeguard against cell overvoltage while powering always-on RTC circuits.

For engineers reviewing the BQ296229DSGR datasheet, BQ296229DSGR pinout, BQ296229DSGR application, or BQ296229DSGR equivalent, key selection considerations include its 4.60 V OVP setting, 6.5 s fault delay, 3.0 V/2 mA REG output, 8-pin WSON (2 mm × 2 mm) package, and self-disable behavior triggered by cell undervoltage below 2.5 V.

Technical Context

The BQ296229DSGR independently monitors each cell voltage in 2–4 series stacks using precision analog comparators referenced to a factory-trimmed 4.60 V threshold with 300 mV hysteresis. Upon detection of any cell exceeding 4.60 V, it initiates a fixed 6.5 s internal timer before asserting the active-high OUT signal to drive an external NMOS FET for fuse blow control.

Its integrated 3.0 V regulator delivers up to 2 mA with ±30 mV load regulation (0–2 mA), self-disables when any cell drops below 2.5 V for ≥6 s, and consumes only 1.2 µA when disabled. The device operates across –40°C to +110°C with input voltage range up to 20 V on VDD and <100 nA per-cell input leakage.

Key Specifications

Pinout & Package

Package: 8-pin WSON (2.00 mm × 2.00 mm), thermally enhanced with exposed pad connected to VSS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ296229DSGR, BQ296231DSGR offers higher regulated voltage but mismatches downstream 3.0 V loads, while BQ296223DSGR lowers OVP sensitivity-requiring revalidation of charge termination and thermal safety margins.

Availability

BQ296229DSGR is available at Aetrix Electronics and suitable for notebook PC battery packs, ultrabook power management systems, and medical portable device designs requiring stable component supply with guaranteed long-term availability.

Supply support for BQ296229DSGR 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 company specializing in analog and embedded processing technologies, with leadership in battery management ICs for consumer, industrial, and automotive markets.

The BQ296xxx family is designed specifically for second-level overvoltage protection in multi-cell Li-ion battery packs, integrating precision sensing, fault timing, and regulated supply generation in a single compact package.

FAQ

What is the factory-programmed overvoltage protection threshold for BQ296229DSGR?

The BQ296229DSGR has a factory-programmed overvoltage protection (OVP) threshold of 4.60 V with ±10 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 initiate the 6.5 s delay timer upon detection. BQ296229DSGR maintains this specification across its full operating temperature range of –40°C to +110°C, with drift bounded to ±54 mV at 110°C.

How does the regulated output (REG) of BQ296229DSGR behave during battery discharge?

The BQ296229DSGR's REG pin delivers a stable 3.0 V output up to 2 mA, but automatically disables when any monitored cell voltage falls below the factory-set 2.5 V undervoltage threshold for ≥6 s. Once disabled, REG remains off until all cells rise above 2.55 V (2.5 V + 50 mV hysteresis). This self-disable function prevents excessive battery drain during storage or deep discharge. BQ296229DSGR draws only 1.2 µA in this state, preserving residual capacity.

What is the purpose of the PWPD pin on BQ296229DSGR?

The PWPD (Power Pad) pin on BQ296229DSGR is not a functional signal pin-it is the exposed thermal pad on the underside of the 8-pin WSON package. Texas Instruments recommends connecting this pad directly to the VSS net on the PCB using multiple thermal vias to improve heat dissipation and electrical grounding. Proper PWPD connection reduces junction-to-board thermal resistance to 32.5°C/W, ensuring reliable operation under sustained 2 mA REG load and high ambient temperatures. BQ296229DSGR performance and lifetime depend on correct PWPD implementation.

Can BQ296229DSGR be used in a 2-cell battery configuration?

Yes, BQ296229DSGR supports 2-cell, 3-cell, and 4-cell Li-ion stacks. For a 2-cell design, connect V1 to the bottom cell's positive terminal and V2 to the top cell's positive terminal; leave V3 and V4 unconnected or short V3 to V2 and V4 to V3 as specified in the datasheet. The device internally ignores unused sense inputs and continues accurate monitoring of (V1–VSS) and (V2–V1). BQ296229DSGR maintains full functionality-including 4.60 V OVP, 6.5 s delay, and 3.0 V REG-in all supported configurations without external component changes.

What external components are required for stable operation of BQ296229DSGR?

BQ296229DSGR requires four 0.1 µF ceramic capacitors (one each on V1–V4 sense inputs), a 0.47 µF ceramic capacitor on the REG pin, and a 0.1 µF capacitor on VDD-all placed close to their respective pins. A 1 kΩ resistor is recommended in series with each sense input for noise filtering (calibration assumes this value). No external components are needed for OVP timing or REG regulation-the 6.5 s delay and 3.0 V output are fully integrated. BQ296229DSGR achieves ±10 mV OVP accuracy only when these recommended RC values are used.