BQ24745RHDRG4

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 Voltage
Charge Current - Max:	8.064A
Battery Pack Voltage:	19.2V (Max)
Voltage - Supply (Max):	24V
Interface:	I²C
Operating Temperature:	-40°C ~ 125°C (TJ)
Package / Case:	28-VFQFN Exposed Pad
Supplier Device Package:	28-VQFN (5x5)
Base Part Number:	BQ24745

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Introduction

The BQ24745RHDRG4 is a complete charge characterization and system level power monitor IC that maximizes the flexibility of power delivery system. BQ24745RHDRG4 is designed to operate from an alternating current (AC) or a direct current (DC) source. It is a 3-phase PMIC - Battery Chargers IC with integrated ripple suppression for low noise charging and flexibility allows for extensive system level options. The BQ24745RHDRG4 integrates state of the art circuitry to enable optimal power sequencing and system safety.

Application Field and Working Principle

The BQ24745RHDRG4 is mainly used in the application of battery charging. It is able to simultaneously monitor power, temperature and voltage on the input, output and storage capacitor bus. Embedded fault protection logic along with on chip isolators allows the BQ24745RHDRG4 to survive extreme fault scenarios, thus providing safe charging of batteries. With 3 Phase current control and high efficiency synchronous buck control, the BQ24745RHDRG4 delivers maximum load power. The working principle of the BQ24745RHDRG4 is based on three-level Power Monitor (PM) and two-level Power Switcher (PW) control system. PM, consisting of input and output PMs, is responsible for keeping the power level at constant level. PW, consisting of main Switcher and booster Switcher, is mainly responsible for controlling the input signal and distributing the power throughout the system. The BQ24745RHDRG4 also features flexible current limit, adjustable voltage regulation and integrated output voltage ripple suppression.

Charging Profiles and Power Management

BQ24745RHDRG4 supports three different charging profiles: constant current, constant voltage, and combination current/voltage (CC/CV) profiles. Constant current charging stage operates with a specified limit of current. Operating at a preset constant current allows for an optimized charging time. Constant voltage charging stage operates with a preset voltage limit. The battery is charged at this voltage until it reaches a near fully charged state. Combination current/voltage charging stage combines these two charging methods, charging the battery at a constant current first, then at a constant voltage. This allows for the battery’s energy to be balanced, thus providing stable and optimized charging performance. The BQ24745RHDRG4 also comes with power management features that allow for efficient power operation. These include Constant On Time (COT) control and Adaptive On Time (AOT) control, both of which allow for enhanced power supply operation and improved efficiency.

Features and Benefits

The BQ24745RHDRG4 has several key features and benefits. The first is its high efficiency, which ensures minimal heat generation in the system and helps extend the overall lifespan of the battery. Battery protection is also enhanced through the BQ24745RHDRG4’s short and OVER voltage protection. The second feature is its adjustable charging current, which is extremely useful in providing efficient and safe charge operations. The adjustable charging current ensures that the user can define the exact current regulation desired. The third feature is its low output ripple, which helps in minimization of EMI noise due to power supply switching. This ensures that the power supply is not disturbed and thus it can continue to operate without any glitches. In addition, the BQ24745RHDRG4 also features flexible current limit setting, adjustable voltage regulation, flexible timer settings and regulated output current monitoring. These features combine to provide an all-around solution for efficient and safe battery charging.

Conclusion

The BQ24745RHDRG4 is a complete charge characterization and system level power monitor IC designed to deliver maximum load power with 3-Phase current control and high efficiency synchronous buck control. Features such as adjustable charging current, low output ripple, flexible current limit setting, adjustable voltage regulation, and regulated output current monitoring, help enhance the efficiency, power stability and safety of battery charging. Additionally, it is mainly used in the application of battery charging and belongs to PMIC - Battery Chargers category. .

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