BQ24751BRHDR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Not For New Designs
Battery Chemistry:	Multi-Chemistry
Number of Cells:	2 ~ 4
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	Over Current, Over Voltage
Charge Current - Max:	10A
Battery Pack Voltage:	18.048V (Max)
Voltage - Supply (Max):	24V
Interface:	--
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	28-VFQFN Exposed Pad
Supplier Device Package:	28-VQFN (5x5)
Base Part Number:	BQ24751

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Introduction

PMIC – Battery Chargers are typically used to charge any type of battery. The BQ24751BRHDR is a highly integrated, high efficiency switching charger with integrated power path management and battery management FETs. It is a single-cell Li-ion charger in a miniaturized 10-pin, thermally enhanced VQFN package.

Application Field

The BQ24751BRHDR provides an ideal solution for consumer electronics and many other applications. It has an adjustable input current capability ranging from 500mA up to 4.0 A, and an adjustable output voltage of 4.2 V. The charging current and charge termination current can also be optimized for many different applications.It features reverse current protection, battery temperature sensing, and input undervoltage protection. Additionally, its charge status output can trigger an interlock to prevent load discharging when the battery is low. It has internal MOSFETs for both main power and charge termination.The BQ24751BRHDR can withstand an ambient temperature range of -20°C to 85°C and is rated at 5V/2.5 A max. It is perfect for extreme temperature applications like medical devices, wearables, mobile phones, wireless headsets and other personal electronic devices.

Working Principle

The BQ24751BRHDR works on a simple principle of charging a battery with a constant current until the battery voltage reaches a maximum voltage, at which point it switches to trickle-charge mode. This gives it an efficiency of up to 93%, making it one of the most efficient battery chargers in its category.When first connected to the battery, the BQ24751BRHDR starts a constant current charging which is determined by the selector pin settings. When the battery voltage reaches the constant voltage or end of charge voltage, the charge current is reduced to termination current, and the charger enters the trickle-charge or maintenance-charge mode.To prevent overcharging, the BQ24751BRHDR is designed with an internal timer that is programmable via the selector pin settings. It will terminate the charging process when the timer reaches time-out. The charger also features precision voltage regulation which eliminates the need for external resistors.

Conclusion

The BQ24751BRHDR is a highly efficient switching charger with integrated power path management and battery management FETs. It is perfect for consumer electronic applications, medical devices, wearables, mobile phones and other personal electronic devices. It is easy to set up, thanks to its adjustable input current and adjustable output voltage, and offers up to 93% efficiency. Finally, it also includes an internal timer and precision voltage regulation, adding to its convenience.

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