Texas Instruments BQ29419PW

Overview

BQ29419PW from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.30 V per-cell overvoltage threshold, <2 µA supply current, and programmable delay via external capacitor on CD pin. It monitors individual cell voltages (VC1–VC4) and drives an external N-channel FET to blow a fuse during overvoltage events - used in notebook computers and portable instrumentation.

For engineers reviewing the BQ29419PW datasheet, BQ29419PW pinout, BQ29419PW application, or BQ29419PW equivalent, key selection criteria include its precise 4.30 V overvoltage detection voltage, 250 mV hysteresis, 1–2 s programmable delay time with 0.22 µF capacitor, low ICC of ≤2 µA at 25°C, and TSSOP-8 (PW) package compatibility with industrial temperature range (–40°C to 110°C).

Technical Context

The BQ29419PW implements independent voltage monitoring across up to four series-connected Li-ion cells using dedicated VC1–VC4 inputs, comparing each against an internal reference to trigger overvoltage protection. Its output (OUT) transitions high when any cell exceeds 4.30 V and the CD pin voltage reaches 1.2 V after programmable charging delay.

Protection recovery occurs only after all cell voltages fall below (4.30 V – 250 mV) hysteresis threshold, ensuring stable reset behavior. The device maintains immunity to power supply ripple and remains functional during pulse charge operation without false triggering.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package, 3.0 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu 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 BQ29419PW, BQ29412PW raises protection voltage by 150 mV for higher-energy-density cells, while BQ29410PW offers a 50 mV increase over BQ29419PW for broader industry-standard compatibility - both retain identical delay programming, low-power operation, and TSSOP-8 footprint.

Availability

BQ29419PW is available at Aetrix Electronics and suitable for smart notebook battery packs, portable medical instrumentation, and industrial handheld scanners requiring stable component supply across extended product lifecycles.

Supply support for BQ29419PW 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 delivering analog and embedded processing solutions, with decades of expertise in battery management and precision analog ICs.

The BQ29419PW belongs to TI's bq2941x secondary protection family, designed specifically to provide robust, low-power, hardware-based overvoltage defense for multi-cell Li-ion battery systems in safety-critical portable applications.

FAQ

What is the exact overvoltage protection threshold voltage of the BQ29419PW?

The BQ29419PW has a fixed, factory-trimmed overvoltage protection threshold of 4.30 V per cell, with accuracy of ±50 mV over –40°C to 110°C. This value is specific to the BQ29419PW variant and differs from other members of the bq2941x family such as BQ29410PW (4.35 V) or BQ29412PW (4.45 V). The BQ29419PW does not support user adjustment of this threshold.

How is the overvoltage detection delay time set for the BQ29419PW?

The BQ29419PW uses an external capacitor connected to the CD pin to set overvoltage detection delay. With a 0.22 µF capacitor, the delay is 1–2 seconds, calculated as t_D = (1.2 V × C_DELAY) / 0.18 µA. The BQ29419PW integrates a precision 0.18 µA current source to charge the capacitor; no resistor or additional components are required.

Does the BQ29419PW support 2-cell, 3-cell, and 4-cell Li-ion configurations?

Yes, the BQ29419PW supports 2-, 3-, and 4-cell Li-ion battery configurations via flexible VC1–VC4 pin assignment. For 2-cell use, VC1, VC2, and VC3 are tied together; for 3-cell, VC1 and VC2 are shorted. All configurations retain full per-cell voltage monitoring capability and maintain the 4.30 V threshold per monitored node.

What is the function of the OUT pin on the BQ29419PW?

The OUT pin on the BQ29419PW is an open-drain output that transitions high when overvoltage is detected and the CD capacitor charges to 1.2 V. It is designed to drive the gate of an external N-channel MOSFET, which in turn activates a fuse-blowing circuit in the battery pack's positive rail. The BQ29419PW does not integrate the FET or fuse.

Is the BQ29419PW pin-compatible with other devices in the bq2941x family?

Yes, the BQ29419PW is pin-compatible with all other bq2941x variants including BQ29410PW, BQ29411PW, and BQ29412PW in the TSSOP-8 (PW) package. Pin functions (VC1–VC4, GND, CD, VDD, OUT) are identical across the family; only the overvoltage threshold and hysteresis values differ - allowing shared PCB layouts with variant-specific BOM selection.