BQ21040DBVT Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	Over Temperature, Over Voltage, Short Circuit
Charge Current - Max:	800mA
Battery Pack Voltage:	4.2V
Voltage - Supply (Max):	6.45V
Interface:	USB
Operating Temperature:	0°C ~ 125°C (TJ)
Package / Case:	SOT-23-6
Supplier Device Package:	SOT-23-6

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BQ21040DBVT Application Field and Working PrincipleThe BQ21040DBVT, a single-cell Li-ion battery charge controller, is a component part of Power Management Integrated Circuits (PMICs) in the field of Battery Chargers. It can provide a regulated power supply and charge control to Lithium-ion (Li-ion) batteries. It enables portable applications, such as tablets and smartphones, to achieve fast and easy charging in a compact form factor.The BQ21040DBVT uses a two-stage, constant current-constant voltage (CC-CV) charge algorithm to charge a single Li-ion battery cell from 4.2 V to 3.3 V. The device comes with several programmable parameters, such as charge current, charge voltage, and charge termination threshold, to enable optimal performance for different Li-ion battery packs.The BQ21040DBVT combines the charge controller with integrated pass transistors, low-dropout (LDO) voltage regulator and logic controller in the same chip. This ensures that the device consumes very little power, while efficiently extracting the maximum amount of energy from the battery. The device also integrates protection circuitry to prevent damage caused by short circuit, over-voltage, over-current and temperature. The integrated LDO voltage regulator further simplifies the design of the entire system.The BQ21040DBVT has a wide variety of applications where it can be used to provide fast charging of single-cell Li-ion battery packs. It is suitable for use in consumer electronics products, such as tablets and smartphones, as well as portable medical devices and wearable electronics. The device is also well suited for use in automotive systems, such as starter batteries and remote keyless entry systems. Additionally, the device can be used in energy storage systems and other power-hungry applications.The BQ21040DBVT works by using a two-stage, constant current-constant voltage (CC-CV) charge algorithm. In the constant current stage, the charge current is set to a pre-programmed value and is then held constant until the battery voltage reaches the minimum charging voltage. At this point, the charge current is reduced to a pre-programmed “float” level and the voltage is then held at this level until the charge current reaches an end-of-charge threshold. Upon reaching this threshold, the device shuts off the charge current, indicating that the battery is fully charged.The BQ21040DBVT also has several protections that ensure safe charging. These include over-temperature, over-voltage, over-current and short circuit protections. These protections ensure that the device does not cause any damage to the battery or other components of the system.In summary, the BQ21040DBVT is a single-cell Li-ion battery charge controller that is part of Power Management Integrated Circuits in the field of Battery Chargers. It provides a regulated power supply and charge control to Li-ion batteries and is suitable for use in consumer electronics, automotive and energy storage applications. The device uses a two-stage, constant current-constant voltage (CC-CV) charge algorithm and integrates protection circuitry to prevent any damage from over-voltage, over-current, temperature and short circuit.

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