Series:	bqTINY™ III
Packaging:	Tape & Reel (TR)
Part Status:	Active
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	1
Current - Charging:	Constant - Programmable
Programmable Features:	Current, Timer
Fault Protection:	Over Temperature, Reverse Current, Short Circuit
Charge Current - Max:	1.5A
Battery Pack Voltage:	4.36V
Voltage - Supply (Max):	16V
Interface:	USB
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	20-VFQFN Exposed Pad
Supplier Device Package:	20-VQFN (3.5x4.5)
Base Part Number:	BQ24038

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BQ24038RHLR Application Field and Working Principle

Introduction

The BQ24038RHLR is a microcontroller-controlled 4-channel switching (2-channel simultaneous) step-down battery charger that provides a complete and powerful solution for Lithium-Ion (Li-Ion) and Lithium-Polymer (Li-Po) battery charging applications. It is a multi-channel, single-cell battery charger meant for faster and safer charging of Li-Ion and Li-Po batteries. BQ24038RHLR is a single-cell principle charger meant for simultaneous charging of two cells by using two independent step-down switching converters connected in parallel. This charger is available in different packages including BGA and QFN formats.

Application Field

The BQ24038RHLR is suitable for use in applications such as portable electronic equipment, video game systems, PDAs, cell phones, digital cameras, notebooks and other similar handheld devices. It\'s also well-suited for automotive and consumer electronics applications. This charger is capable of charging up to 4 cells simultaneously, and its multi-channel design makes it ideal for applications where space is a concern.

Features

The BQ24038RHLR has the following features:

• Integrated N-channel MOSFETs
• Built-in circuit protection circuitry
• Automatic sensing of charging current
• Constant voltage/current/temperature charging
• High charging efficiency with automatic power management
• Precharge detection before charging begins
• Programmable charging current and voltage levels
• Programmable charge termination
• Charge status LED indication

Working Principle

The BQ24038RHLR is integrated with N-channel MOSFETs, built-in circuitry protection, and other control components, as well as synchronous rectification control, which allow the charger to achieve high efficiency and reduce system energy losses. The charger works on a constant voltage/current/temperature charging principle. It can automatically detect the type of battery being charged and adjust the charging parameters accordingly. The charge is terminated when the voltage of each cell reaches its maximum limit or when the set time has elapsed. An LED indication is used to show the status of the charge. The charger is designed to sense the input voltage and then step down the voltage to the correct voltage for charging the battery. It then uses constant current/voltage charging to maintain the specified charging levels until the battery is fully charged. The charger provides several levels of protection including short-circuit, over-temperature, and over-voltage protection. It also has programmable termination for current, voltage, and temperature and over-discharge detection.

Conclusion

The BQ24038RHLR is a microcontroller-controlled 4-channel switching (2-channel simultaneous) step-down battery charger. It is suitable for applications such as portable electronic equipment, video game systems, PDAs, cell phones, digital cameras, notebooks and other similar handheld devices. It is integrated with several features including integrated N-channel MOSFETs, built-in circuit protection circuitry, and other control components. The charger works on a constant voltage/current/temperature charging principle and it is designed to sense the input voltage and then step down the voltage to the correct voltage for charging the battery. It also provides several levels of protection, including short-circuit, over-temperature, and over-voltage protection.

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