ISL85403FRZ-TK

Voltage - Input (Max):	40V
Supplier Device Package:	20-QFN (4x4)
Package / Case:	20-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 105°C (TA)
Synchronous Rectifier:	Both
Frequency - Switching:	200kHz ~ 2.2MHz
Current - Output:	2.5A
Voltage - Output (Max):	36V
Voltage - Output (Min/Fixed):	0.5V
Series:	--
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost, Buck-Boost
Output Configuration:	Positive
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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PMIC - Voltage Regulators - DC DC Switching Regulators

The ISL85403FRZ-TK is an industry-leading synchronous DC/DC voltage regulator. It is designed to deliver superior system performance, efficiency and reliability for a variety of different applications. The ISL85403FRZ-TK is a member of the ISL85x03 family of synchronous buck regulators, offering a wide range of input and output voltages and currents, adjustable output voltage and current, low output voltage ripple and fast transient response. It is suitable for a wide range of inputs, including 12V and 24V industrial applications.The ISL85403FRZ-TK is designed to operate from a wide input voltage range of 4.5V to 28V. It is compatible with all popular analog and digital current-mode PFC controllers and can regulate and maintain an output voltage of up to 24V. The current limit can be set and adjusted through an external voltage divider and a resistor. The output voltage can be adjusted within the range of 0.95V to 28V. The ISL85403FRZ-TK can deliver up to 10A of output current with a large power conversion efficiency ranging from 85% to 95%. It offers fast transient response with a switching frequency of up to 1.7MHz. It also provides a low-noise operation with a quiescent current of just 2.5mA. The ISL85403FRZ-TK also provides a variety of protections, such as over-temperature, overvoltage, and undervoltage protection. It also supports a wide range of output voltage tracking and sequencing options. It is available in a small 2.5mm x 3mm package. The ISL85403FRZ-TK regulator is ideal for a wide range of power conversion applications in industrial, automotive, medical, and communications systems. As it provides high efficiency and fast transient response, it can be used as a dependable and cost-effective solution for a variety of power conversion needs.

Working Principle

The ISL85403FRZ-TK is a synchronous buck regulator that converts a higher input voltage to lower a output voltage with a switching transistor circuit. It steps down the voltage from the input voltage to the lower value of the output by regulating the rate at which the current flows in the switching circuit. The ISL85403FRZ-TK uses a current-mode control technique to regulate the output voltage so that it stays within an acceptable range. It consists of an error amplifier, a driver circuit, and a power switch. In each switching cycle, the driver circuit charges or discharges the power switch according to the voltage feedback. The error amplifier senses the output voltage of the regulator and compares it to the reference voltage, which is generated from the adjusting pin. When the output voltage is lower than the reference voltage, the error amplifier turns on the driver which in turn turns on the power switch. This allows the current to flow from the input to the output and the output voltage rises. The same process occurs when the output voltage is higher than the reference voltage, however, in this case the error amplifier turns off the power switch and the current flow is stopped. The ISL85403FRZ-TK also incorporates a wide range of protection mechanisms to safeguard the power switch and the system against over-current, over-voltage and over-temperature conditions.

Conclusion

The ISL85403FRZ-TK is a high-performance synchronous switching regulator that offers excellent power conversion efficiency and fast transient response for industrial, automotive, and communications systems. It can provide up to 10A of output current with a wide input voltage range of 4.5V to 28V. It also offers adjustable voltage and current limit, low-output voltage ripple and protects against over-temperature, over-current and over-voltage conditions. It is available in a small 2.5mm x 3mm package. With its features and benefits, theISL85403FRZ-TK can be an ideal choice for a variety of power conversion applications.

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