UC3909DW

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Battery Chemistry:	Lead Acid
Number of Cells:	--
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	--
Charge Current - Max:	--
Battery Pack Voltage:	--
Voltage - Supply (Max):	40V
Interface:	--
Operating Temperature:	0°C ~ 70°C (TA)
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	20-SOIC
Base Part Number:	UC3909

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UC3909DW Application Field and Working Principle

PMIC - Battery chargers pertain to devices that are used to charge and maintain the charge state of a battery by providing controlled input power. One such device is the UC3909DW Integrated Li-Ion/Li-Polymer Charge State Controller from Texas Instruments. This device is specifically designed for advanced charging of Lithium-ion and Lithium-polymer cell-type batteries. This exceptional device is a versatile charge state controller and provides Auto-Switch (TM) capabilities to accommodate a wide range of battery types, capacities,and charging requirements.

Application Fields

The UC3909DW is suitable for any application involving high-performance battery charging. Its integrated Auto-Switch (TM) technology allows for a wide range of Li-ion and Li-polymer battery types and sizes to be used. It has been widely used in applications such as portable medical devices, high-end audio and digital media players, mobile phones, car navigation systems, multifunction digital cameras, advanced PDAs and other smart devices.

Description

The IC features a highly integrated control solution with a feature set and algorithm optimized for Li-ion and Li-polymer battery management. Its Auto-Switch (TM) technology allows it to automatically detect and adapt to charge different cell-type batteries simply by changing the parameters set in the IC. Features of the chip such as overtemperature protection, short circuit protection, charge current and voltage regulation and voltage monitor ensure safe and reliable operation.

Hardware Overview

The IC consists of a power supply block, a 3-phase charger and a real-time monitor sub-system. The power supply consists of an integrated switching power supply controller, power MOSFETs, an error amplifier and an overvoltage/undervoltage protection circuit. The 3-phase charger consists of an over-voltage/undervoltage protection circuit, an input voltage and current monitor, a charge current and voltage monitor, a temperature monitor and a charge FET. The real-time monitor sub-system includes an integrated temperature monitor, over-temperature and overcharge protection, safety timer and a charge status monitor.

Working Principle

The UC3909DW adopts an adaptive, capacitive capacitor-divider and an integrated DC-DC power supply control system to produce a precise and reliable charging current. The charger divides the charging current into five phases: precondition, constant voltage- current, trickle charge, charge termination, and float. At the beginning of the pre-condition phase, the charger charges the battery with a small current to “wake-up” the battery. When the voltage of the battery is higher than the preset “wake-up” voltage, the charger moves to the constant-voltage stage. During this stage, the charger maintains the battery voltage at a certain fixed voltage determined by the terminal connected voltage and the battery capacity. When the charge current reaches a certain level determined by the surface area of the battery, the charger moves to the trickle mode. In this mode, the charger applies a small current to prevent the battery voltage from dropping. When the battery voltage reaches a predetermined level, the timer indicates the termination of the charge, and the charger moves to the float mode. In the float mode, the charger maintains the battery voltage at a stable level without applying any current to the battery. This prevents the battery from overcharging and excessive battery life.

Conclusion

The Texas Instruments UC3909DW is an exceptional device offering a highly effective battery charging and management solution for advanced Li-ion and Li-polymer batteries. With its Auto-Switch (TM) ability, the IC is able to optimize the charging current for a wide range of cell-type batteries, ensuring reliable and safe operation. Its 3-phase charging algorithm allows it to charge the battery with a precise and reliable current and its monitor sub-system provides comprehensive protection against overcharge and over temperature. The versatile IC is an excellent choice for any application involving high-performance battery charging.

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