Texas Instruments BQ29413DCTT

Overview

BQ29413DCTT from Texas Instruments is a secondary overvoltage protection IC for 2-, 3-, or 4-cell Li-ion battery packs, featuring fixed 4.50 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 in notebook computers and portable instrumentation.

For engineers reviewing the BQ29413DCTT datasheet, BQ29413DCTT pinout, BQ29413DCTT application, or BQ29413DCTT equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, validated alternatives, and supply-chain support for high-reliability battery safety design.

Technical Context

The BQ29413DCTT implements precision voltage monitoring across up to four series-connected Li-ion cells using dedicated VC1–VC4 inputs, with internal reference accuracy of ±25 mV at 25°C and ±80 mV over –40°C to 110°C. Its overvoltage detection triggers a 0.18 µA current source charging an external capacitor on CD, enabling precise delay tuning (e.g., 1.5 s with 0.22 µF).

Upon CD reaching 1.2 V, OUT transitions high to activate an external NCH FET; recovery occurs only after all cells fall below (V(PROTECT) – Vhys), where Vhys = 320 mV. The device maintains stable operation during pulse charging and rejects supply ripple without requiring external regulators.

Key Specifications

Pinout & Package

Package: SSOP-8 (DCT), 3.95 mm × 4.25 mm × 1.3 mm, RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29414DCTT and BQ29412DCTT, the BQ29413DCTT provides the industry-standard 4.50 V/cell trip point-optimized for mainstream Li-ion cells balancing safety margin and usable capacity, without requiring layout changes or firmware updates.

Availability

BQ29413DCTT is available at Aetrix Electronics and suitable for notebook computers, portable medical devices, industrial test equipment, and power tools requiring stable component supply and long-term lifecycle support.

Supply support for BQ29413DCTT 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 BQ29413DCTT belongs to TI's bq2941x family of secondary overvoltage protection ICs, designed specifically for hardware-enforced, autonomous cell-level overvoltage cutoff in multi-cell Li-ion battery packs.

FAQ

What is the exact overvoltage protection threshold of the BQ29413DCTT?

The BQ29413DCTT has a fixed, factory-trimmed overvoltage protection threshold of 4.50 V per cell, specified with ±80 mV accuracy over the full –40°C to 110°C operating temperature range. This value is not adjustable and applies uniformly to all monitored cells (VC1–VC4) in 2-, 3-, or 4-cell configurations. The BQ29413DCTT uses this threshold to initiate the CD pin delay timer upon detection.

How does the BQ29413DCTT implement delay timing, and what capacitor value achieves a 1.5-second response?

The BQ29413DCTT implements delay timing by sourcing a precise 0.18 µA current into an external capacitor connected to the CD pin. When the CD voltage reaches 1.2 V, the OUT pin activates. Using t_D = (1.2 V × C_DELAY) / 0.18 µA, a 0.22 µF capacitor yields a nominal 1.5-second delay. This timing is confirmed in the Electrical Characteristics table and Figure 2 of the SLUS669G datasheet for the BQ29413DCTT.

Can the BQ29413DCTT be used in a 2-cell Li-ion battery configuration?

Yes, the BQ29413DCTT supports 2-cell configurations by connecting VC1 and VC2 together to the top of the stack, VC4 to the bottom cell's cathode, and leaving VC3 unconnected (or tied to GND per TI application guidance). The device internally validates differential voltages across VC1–VC2, VC2–VC3, VC3–VC4, and VC4–GND, making it fully functional in 2-, 3-, or 4-cell topologies without external component changes.

What is the maximum supply voltage the BQ29413DCTT can tolerate on its VDD pin?

The BQ29413DCTT supports a VDD supply voltage range of –0.3 V to 28 V, as specified in the Absolute Maximum Ratings table. This allows direct connection to the full battery stack voltage-for example, up to ~16.8 V for a charged 4-cell Li-ion pack-without external regulation. Operation remains valid from 4 V to 25 V per Recommended Operating Conditions, ensuring robustness across charge/discharge cycles.

Does the BQ29413DCTT require external passive components beyond the CD capacitor?

Yes, the BQ29413DCTT requires external RC filters on VCx inputs (R_IN = 100 Ω–1 kΩ, C_IN = 0.01–0.1 µF) and on VDD (R_VD ≤ 1 kΩ, C_VD ≥ 0.1 µF) per the datasheet's Recommended Operating Conditions. These filters suppress high-frequency noise and ensure stable voltage monitoring. No external resistors are needed for threshold setting-the 4.50 V trip point is internal and fixed in the BQ29413DCTT.