ISL85003FRZ

Voltage - Input (Max):	18V
Supplier Device Package:	12-DFN (4x3)
Package / Case:	12-VFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	500kHz
Current - Output:	3A
Voltage - Output (Max):	18V
Voltage - Output (Min/Fixed):	0.8V
Series:	--
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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AbstractThis article is about the application field and working principle of the ISL85003FRZ, a DC-DC switching regulator from the line of PMIC voltage regulators. The ISL85003FRZ is a high-efficiency synchronous buck regulator designed for automotive applications. It is capable of delivering a maximum output voltage of 24V and a maximum output current of 3A. Its working principle and various applications are discussed in detail.IntroductionThe ISL85003FRZ is a high-efficiency synchronous buck regulator introduced by Intersil, which is a part of the PMIC (Power Management ICs) line of voltage regulators. As an advanced DC-DC switching regulator, the ISL85003FRZ is capable of efficiently converting input voltage of up to 26V to an output voltage of 24V and deliver a maximum output current of 3A. This rugged device can easily withstand input/output transient voltages, as well as overload conditions, making it an ideal solution for automotive applications. Working PrincipleThe ISL85003FRZ works on the concept of synchronous buck regulation, wherein two equipotent lines, namely, the high-side and low-side, are connected in series. The high-side line is connected to the source of power, while the low-side is connected to the load. This series connection is established by a top-side and bottom-side MOSFET switch, which controls the amount of power being supplied to the load. The regulator then regulates the voltage by adjusting the duty cycle of the MOSFET switch. The output voltage is equal to the ratio of the duty cycle and the input voltage, multiplied by the switching frequency.Suggested ApplicationsThe ISL85003FRZ is an ideal power conversion solution for automotive applications, such as Battery Management System (BMS), Low-Power System (LPS), Electrical distribution, and Emergency Tracking System (ETS). It can also be used in applications where high transient protection and overload protection are required, such as Solar Energy System, Battery Charger, LCD TV and LED lighting. Additionally, the ISL85003FRZ features an integrated FET-level voltage and current protection, as well as over-temperature protection and anti-ringing control, which makes it suitable for high-performance motor control applications.ConclusionThe ISL85003FRZ is a high-efficiency synchronous buck regulator designed for automotive applications. It is capable of delivering a maximum output voltage of 24V and a maximum output current of 3A. Its working principle is based on the concept of synchronous buck regulation, wherein two equipotent lines, namely, the high-side and low-side, are connected in series. The ISL85003FRZ is an ideal solution for applications where high transient protection and overload protection are required, such as Solar Energy System, Battery Charger, LCD TV and LED lighting.

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