BQ29412PWR Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Function:	Battery Protection
Battery Chemistry:	Lithium-Ion
Number of Cells:	2 ~ 4
Fault Protection:	Over Voltage
Interface:	--
Operating Temperature:	-40°C ~ 110°C (TA)
Package / Case:	8-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:	8-TSSOP
Base Part Number:	BQ29412

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PMIC – Battery Management The BQ29412PWR is a relatively new integrated circuit that lies in the realm of Power Management ICs (PMIC). Specifically, this chip belongs to the battery management family of PMICs, which serve an important role in keeping the battery of a device optimally charged and discharged, enabling it to work at its best. This article will detail the application field and working principle of the BQ29412PWR.Due to the chip’s design and purpose, the BQ29412PWR finds numerous applications in the portable device field. It is mainly used for Li-ion batteries, but can also be applied for other battery chemistries such as NiMH, LiFePO4, and SLA. It can be integrated with other power management devices to help accurately monitor the charge/discharge cycle of the battery, ensuring optimal performance and maximum longevity of the battery.In terms of its design, the BQ29412PWR features an integrated architecture comprising a battery stack, pass and load switches, low-temperature delta, a sense resistor and a charge pump. All of these components help to accurately measure and control the battery’s charge and discharge rates. In addition, the chip has several safety features including over-temperature, over-voltage, over-charge and over-discharge protection.The BQ29412PWR operates in two charge/discharge cycles. The first one is the constant current/constant voltage (CC/CV) cycle and the second one is the differential voltage (DV) cycle. The CC/CV cycle is used to top off the battery, while the DV cycle is used to maintain the battery’s charge.During the CC/CV cycle, the chip continuously monitors the battery voltage and current. When the voltage reaches its maximum level, the charge current is reduced and the chip switches to the DV cycle. In the DV cycle, the chip monitors the battery voltage and detects when the voltage drops below a preset value. At this point, it will switch back to the CC/CV cycle to begin the topping off process.On the whole, the BQ29412PWR allows for precise and safe control over the charging and discharging of Li-ion batteries and other chemistries. It is a key component for engineers in creating portable devices with a long battery life, thus making the usage and hassle of charging the battery on a regular basis less of a strain on the user.

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