BQ2004ESN

Series:	--
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Multi-Chemistry
Number of Cells:	--
Current - Charging:	Constant, Pulsed
Programmable Features:	Voltage
Fault Protection:	--
Charge Current - Max:	--
Battery Pack Voltage:	--
Voltage - Supply (Max):	5.5V
Interface:	--
Operating Temperature:	-20°C ~ 70°C (TA)
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	16-SOIC
Base Part Number:	BQ2004

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Introduction

BQ2004ESN is a miniaturized Energy Station IC from Texas Instruments that integrates a dual FET buck controller and a comparator-based CTM into one device. It is designed for charging a single cell Li-Ion or Li-Pol battery from a wall adapter or USB port. BQ2004ESN is appropriate for a variety of DC/DC applications such as wireless charging, portable media players, cellular phones, digital cameras, camcorders, handheld terminals, and other portable battery-powered systems.

Application Field

The BQ2004ESN is ideal for any single cell Li-Ion or Li-Pol battery powered application requiring a High Efficiency, Low Component Count DC/DC Charger. It provides a high efficiency, dual FET buck charger with low standby current. The CTM enables excellent line and load regulation. It also requires minimal external components and is simple to implement.BQ2004ESN can be used to directly charge from USB or an AC/DC adapter. It is suitable for applications such as wireless charging, portable media players, cellular phones, digital cameras, camcorders, handheld terminals, and other portable battery-powered systems.

Working Principle

The BQ2004ESN is a dual FET buck controller and CTM integrated in one device, designed for charging single cell Li-Ion or Li-Pol batteries from a wall adapter or USB port. It regulates the output voltage of the Buck converter. The output voltage of the Buck converter is regulated through the CTM. It compares the voltage on the capacitor to a reference voltage and produces an error signal which is used to control the FET switches of the converter. The error signal is used to control the duty cycle of the switching regulator to maintain the required voltage across the battery. The CTM also monitors the current through the battery and limits the maximum amount of current that the battery can draw from the input source. This feature helps protect the battery from overcurrent conditions.

Conclusion

The BQ2004ESN is a high efficiency, low component-count Buck charger with CTM integration. It is suitable for a variety of DC/DC applications such as wireless charging, portable media players, cellular phones, digital cameras, camcorders, handheld terminals, and other portable battery-powered systems. It is an efficient and simple solution for single cell Li-Ion and Li-Pol battery charging.

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