LTC4081EDD#TRPBF

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:	--
Charge Current - Max:	500mA
Battery Pack Voltage:	4.2V
Voltage - Supply (Max):	5.5V
Interface:	I²C
Operating Temperature:	0°C ~ 70°C (TA)
Package / Case:	10-WFDFN Exposed Pad
Supplier Device Package:	10-DFN (3x3)
Base Part Number:	LTC4081

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PMIC - Battery Chargers Application Field and Working Principle of LTC4081EDD#TRPBF

Power management integrated circuits (PMICs) provide the power system design with a wide range of features and functions. These features and functions help to reduce costs, increase flexibility, and improve overall power supply design performance. One important type of PMICs are the Battery Chargers. Battery Chargers, as the name suggests, are integrated circuits that are used to charge a variety of batteries such as Lithium-ion, Nickel-Metal Hydrid (NiMH), and Lead Acid batteries. The LTC4081EDD#TRPBF is a Li-Ion/Li-Pol Battery Charger IC from Analog Devices that enables efficient, compact and cost-effective Li-ion/Li-polymer battery charge systems. This Battery Charger IC combines key functions such as current limitation, thermal regulation, short-circuit protection, and AC adapter plug in/out re-detection in a small leadless SOT-23 package. This IC provides a precise and flexible battery charging current in a temperature-compensated exact-value current mode. The LTC4081EDD#TRPBF also offers a thermally regulated constant-voltage charge mode with current and charge termination. Moreover, the LTC4081EDD#TRPBF features an AC Adapter Voltage Range Monitor, which allows charge systems to detect a wide range of AC adapter voltage inputs.

Applications of the LTC4081EDD#TRPBF

The application field of the LTC4081EDD#TRPBF includes renewable energy sources such as solar, wind and hydro. It is also suitable for battery-powered systems such as portable medical, instrumentation, GPS, automotive, and consumer electronics.

Working Principle of the LTC4081EDD#TRPBF

The LTC4081EDD#TRPBF works on the principle of constant current and constant voltage charging for Lithium-ion and Li-polymer batteries. The IC is designed to limit the current delivered to the cell when the AC adapter voltage source is present in the system. This reduces the charging time and also prevents the battery from overcharging.The LTC4081EDD#TRPBF features a built-in thermal monitoring circuit that helps in maintaining a predetermined temperature level of the charging system. The thermal monitoring function keeps the thermal protection circuit from activating due to high temperature levels caused by heavily loaded charging systems.The lithium-ion batteries available in the market usually have over-voltage safety specification of 4.2V per cell whilst Li-polymer batteries have over-voltage safety specification up to 4.4V per cell. The LTC4081EDD#TRPBF also contains circuitry that protects against over-voltage conditions. The over-voltage tolerance limit is programmed by a voltage input from the system, which when integrated with an external over-voltage detector limits the output voltage of the IC to a predetermined level.The LTC4081EDD#TRPBF comes with an integrated AC adapter plug in/out detection circuit. The circuit is able to detect a wide range of AC adapter voltage inputs and out of this range and will reset the charger. The AC adapter plug in/out detection circuit also helps in re-enabling charging if the AC adapter plugged in is within the expected voltage range. The AC adapter plug in/out detection circuit also helps in avoiding an accidental charge termination due to AC adapter plug out/in event.The LTC4081EDD#TRPBF also supports a host of safety features such as short-circuit protection, voltage input under-voltage protection and over-current protection. The device can also accurately detect the presence of no battery (Zero Load) condition.

Conclusion

The LTC4081EDD#TRPBF from Analog Devices is a Li-Ion/Li-Polymer Battery Charger IC that offers a precise and flexible battery charging current in a temperature-compensated exact-value current mode with current and charge termination. This device provides key features such as current limitation, thermal regulation, short-circuit protection and AC adapter plug in/out detection in a small leadless SOT-23 package. The LTC4081EDD#TRPBF is suitable for battery-powered systems such as portable medical, instrumentation, GPS, automotive and consumer electronics. With its range of features and functions, the LTC4081EDD#TRPBF is sure to find a place in many design applications.

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