Texas Instruments BQ29410PWRG4

Overview

BQ29410PWRG4 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, programmable delay via external capacitor on CD pin, and ultra-low 2 µA supply current. It monitors individual cell voltages (VC1–VC4), triggers OUT high to activate external fuse-blowing circuitry upon overvoltage, and operates across –40°C to 110°C ambient.

For engineers reviewing the BQ29410PWRG4 datasheet, BQ29410PWRG4 pinout, BQ29410PWRG4 application, or BQ29410PWRG4 equivalent, key selection criteria include its precise 4.35 V protection threshold, 1–2 s delay time with 0.22 µF CD capacitor, TSSOP-8 (PW) package compatibility, and role as second-level safety device in portable Li-ion systems requiring IEC 62133 or UL 1642 compliance.

Technical Context

The BQ29410PWRG4 implements independent voltage monitoring of up to four series-connected Li-ion cells using precision internal reference and comparator circuitry. Its overvoltage detection accuracy is ±25 mV at 25°C and ±80 mV over full temperature range (–40°C to 110°C), with 320 mV hysteresis to prevent chatter during recovery.

Upon detection, it initiates a controlled delay by charging an external capacitor via a 0.18 µA current source on the CD pin; when CD reaches 1.2 V, the open-drain OUT pin pulls high to drive an external N-channel FET. The device maintains stable operation during pulse charging and rejects supply ripple without false triggering.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-2 (260°C, 1 year).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29410PWRG4, the BQ29411PWRG4 offers +50 mV headroom for marginal voltage tolerance, while BQ29412PWRG4 adds +100 mV-both retain identical timing, package, and reliability specs but shift protection boundary upward, requiring revalidation of cell stress and thermal performance.

Availability

BQ29410PWRG4 is available at Aetrix Electronics and suitable for notebook computer battery packs, portable instrumentation power systems, and industrial cordless power tools requiring stable component supply, long-lifecycle support, and RoHS-compliant TSSOP-8 packaging.

Supply support for BQ29410PWRG4 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 IC design.

The bq2941x product line was engineered specifically for redundant, hardware-based overvoltage protection in multi-cell Li-ion battery packs, targeting applications where firmware-controlled protection alone is insufficient for functional safety compliance.

FAQ

What is the exact overvoltage protection threshold of the BQ29410PWRG4?

The BQ29410PWRG4 has a fixed, factory-trimmed overvoltage protection threshold of 4.35 V per cell, with accuracy of ±25 mV at 25°C and ±80 mV over the full operating temperature range (–40°C to 110°C). This value is specific to the BQ29410 variant and differs from other members of the bq2941x family such as BQ29411 (4.40 V) or BQ29412 (4.45 V).

How does the BQ29410PWRG4 implement programmable delay time?

The BQ29410PWRG4 uses an internal 0.18 µA current source to charge an external capacitor connected to the CD pin; when the CD voltage reaches 1.2 V, the OUT pin activates. With a 0.22 µF capacitor, the delay is 1–2 seconds. The BQ29410PWRG4 does not require external resistors or digital configuration-delay is purely analog and capacitor-dependent.

Can the BQ29410PWRG4 be used in 2-cell and 3-cell battery configurations?

Yes, the BQ29410PWRG4 supports 2-, 3-, and 4-cell Li-ion configurations. For 2-cell use, VC1 and VC2 are tied together and connected to the top of the stack; for 3-cell, VC1 and VC2 are shorted. The device automatically adapts sensing based on which VC pins are connected, and all configurations maintain the same 4.35 V per-cell threshold and delay behavior.

What is the recommended external FET type for driving the OUT pin of the BQ29410PWRG4?

The BQ29410PWRG4 OUT pin is an open-drain output rated for 1.5–2.5 V high-level voltage at 40 µA sink current. It is designed to drive the gate of a discrete N-channel MOSFET (e.g., Si2302, DMN2004K) that controls the positive battery rail fuse. A pull-up resistor (typically 10–100 kΩ to VDD) is required, and gate capacitance must be compatible with the BQ29410PWRG4's output drive capability.

Does the BQ29410PWRG4 require any external passive components besides the CD capacitor?

Yes-the BQ29410PWRG4 requires a 0.22 µF capacitor on CD for delay timing, plus a 0.1 µF ceramic capacitor between VDD and GND for supply decoupling. Optional RC filters (100 Ω–1 kΩ + 0.01–0.1 µF) may be added to each VC pin for noise immunity, and a 0–1 kΩ resistor + 0.1 µF capacitor can filter VDD if supply ripple exceeds specification limits.