Texas Instruments BQ29410PWG4

Overview

BQ29410PWG4 from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.35 V per-cell overvoltage threshold, <2 µA supply current, and programmable delay via external capacitor on CD pin. It drives an external N-channel FET to blow a fuse during overvoltage events in portable instrumentation and notebook computers.

For engineers reviewing the BQ29410PWG4 datasheet, BQ29410PWG4 pinout, BQ29410PWG4 application, or BQ29410PWG4 equivalent, key selection criteria include cell count support (2–4 series), precision voltage threshold tolerance (±25 mV at 25°C), low-power operation, CD-pin-based delay timing, and TSSOP-8 package compatibility with high ripple rejection.

Technical Context

The BQ29410PWG4 implements independent per-cell voltage monitoring using four VCx inputs (VC1–VC4) referenced to GND, with internal comparator circuitry that triggers only when any single cell exceeds 4.35 V. Its protection sequence initiates a 1.2 V threshold-based charge on the CD pin, enabling precise delay control without external timing ICs.

It operates across –40°C to 110°C ambient temperature, supports up to 28 V absolute max input on all VCx pins, and maintains stable output during pulse charging due to high power supply ripple rejection - critical for battery management systems where transient noise may falsely trigger protection.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package: 3.0 mm × 4.4 mm, 0.65 mm pitch, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29412PWG4, the BQ29410PWG4 provides earlier overvoltage intervention at 4.35 V - critical for standard Li-ion cells - while BD1400GUL lacks multi-cell sensing entirely and cannot replace it in 2S+ battery management architectures.

Availability

BQ29410PWG4 is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, portable medical devices, and industrial handheld scanners requiring stable component supply with full lifecycle traceability.

Supply support for BQ29410PWG4 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, embedded processing, and power management technologies with over 50 years of innovation in battery safety ICs.

The bq2941x product line was designed specifically for secondary overvoltage protection in multi-cell Li-ion battery packs, delivering precision voltage monitoring, ultra-low power consumption, and robust noise immunity for portable and industrial applications.

FAQ

What is the exact overvoltage protection threshold of the BQ29410PWG4?

The BQ29410PWG4 has a fixed overvoltage detection voltage of 4.35 V per cell, with accuracy of ±25 mV at 25°C and ±80 mV over –40°C to 110°C. This value is factory-trimmed and non-adjustable - distinct from other members of the bq2941x family such as BQ29412PWG4 (4.45 V) or BQ29419PWG4 (4.30 V).

How does the BQ29410PWG4 implement programmable delay timing?

The BQ29410PWG4 uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin. When CD voltage reaches 1.2 V, the OUT pin activates. With a 0.22 µF capacitor, delay time is 1–2 seconds - allowing designers to tune response latency without additional ICs or firmware.

Can the BQ29410PWG4 be used in a 2-cell Li-ion configuration?

Yes, the BQ29410PWG4 supports 2-, 3-, and 4-cell configurations. For 2S operation, connect VC1 = VC2 = VC3 = VDD and VC4 to the bottom cell terminal, with GND completing the chain. The device monitors VC4–GND and VC1–VC2 simultaneously to detect overvoltage on either cell.

What package type and lead finish does the BQ29410PWG4 use?

The BQ29410PWG4 uses the TSSOP-8 (PW) package: 4.4 mm × 3.0 mm, 0.65 mm pitch, with green RoHS-compliant finish (Pb-free, no Sb/Br) and Cu-Ni-Pd-Au lead finish. Moisture sensitivity level is MSL-2 (260°C peak reflow, 1-year floor life).

Does the BQ29410PWG4 include an integrated MOSFET or require external components?

The BQ29410PWG4 does not include an integrated power switch. It requires an external N-channel MOSFET controlled by the OUT pin to interrupt the battery pack's positive rail. A fuse is also required downstream of the FET to physically open the circuit upon overvoltage detection - per TI's functional block diagram.