Mfr Part #:

BQ29449DRBR

Q: What is the overvoltage protection threshold?

4.3V fixed for 2-4 cell Li-Ion/Polymer.

Q: What package is available?

8-SON (3x3mm) with exposed pad.

The Texas Instruments BQ29449DRBR is a secondary over-voltage protection IC designed for 2 to 4 series cell Li-Ion battery packs. It offers high-accuracy overvoltage detection and low power consumption.

✓ Total Stock: 19,491 pcs

$ Price Range: $1.00

BQ29449DRBR Available from 3 distributors

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Unit Electronics Co.,Limited ✓ Non-Authorised Inventory information	12,200 pcs On Request	12200 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request
Optech Co.,Limited ✓ Non-Authorised Inventory information	7,000 pcs On Request	7000 pcs	On Request	1	On Request	On Request	10+	On Request	On Request
Smaxon Electronics ✓ Non-Authorised Inventory information	291 pcs On Request	291 pcs	On Request	1	On Request	On Request	1223+	On Request	On Request

BQ29449DRBR Description

Short technical summary and product information.

The BQ29449DRBR from Texas Instruments is a secondary over-voltage protection integrated circuit specifically designed for 2-series, 3-series, or 4-series cell Lithium-Ion battery packs. It incorporates a high-accuracy precision overvoltage detection circuit with a typical accuracy of ±25 mV within an operating temperature range of 0°C to 60°C.

This IC features fixed overvoltage protection thresholds, with options including 4.30V. It operates with low power consumption, drawing less than 2 µA typical when all cells are below the protection voltage. The device includes an external capacitor-controlled delay timer, allowing for adjustable delay before signaling an overvoltage condition.

The BQ29449DRBR is housed in a small 8-lead VSON (DRB) package, suitable for surface mounting. Its primary applications include second-level protection in Li-Ion battery packs for devices such as notebook computers, power tools, and portable equipment.

Key specifications include a wide operating temperature range of -40°C to 85°C. The device supports 2 to 4 cells and is compatible with Lithium Ion battery chemistries. It is available in an 8-VDFN Exposed Pad package.

BQ29449DRBR Quick Information

Product Type: Battery Protection IC

Series: BQ29449

Canonical Name: BQ29449DRBR Secondary Over-Voltage Protection IC

Subcategory: Battery Protectors

BQ29449DRBR Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

BQ29449DRBR Estimated Pricing

Qty	Low	High
1+	$1.00	$1.00

Estimated market price range - modelled values for guidance only, not live distributor offers.

BQ29449DRBR Features

Secondary over-voltage protection for 2-4 cells.
High-accuracy overvoltage detection ±25 mV.
Low power consumption, < 2 µA typical.
External capacitor-controlled delay timer.
Small 8-lead VSON (DRB) package.

BQ29449DRBR Applications

Protection for Li-Ion battery packs.
Used in notebook computers.
Suitable for power tools.
Applicable to portable equipment.

BQ29449DRBR FAQs

7 frequently asked questions generated from this part’s specifications.

What is the overvoltage protection threshold?

4.3V fixed for 2-4 cell Li-Ion/Polymer.

What is the accuracy of the overvoltage protection?

±25mV over 0°C to 60°C.

What is the quiescent current consumption?

Less than 2µA typical.

How many cells can this IC protect?

2 to 4 cells in series.

What battery chemistry is supported?

Lithium Ion.

What is the operating temperature range?

-40°C to 85°C.

What package is available?