ISL78235AARZ-T

Voltage - Input (Max):	5.5V
Supplier Device Package:	16-WFQFN (5x5)
Package / Case:	16-VQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 105°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	420kHz ~ 4.2MHz
Current - Output:	5A
Voltage - Output (Max):	5.5V
Voltage - Output (Min/Fixed):	0.6V
Series:	Automotive, AEC-Q100
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

ISL78235AARZ-T is a fully integrated, monolithic synchronous buck capacitor-input regulator with a wide input voltage range and high power output of up to 1A. Its performance is excellent and cost-effective, and its features include programmable output voltage, adjustable soft-start, power-good flag, no-load, over-current and under voltage protection, and over temperature protection. This device, while typically used as a single-stage regulator, can also be used in dual-stage topology, including buck-boost, SEPIC and Zeta configurations, making it suitable for many different applications. It is designed for a wide variety of DC-DC converters, such as oscillator regulator, switching regulator, and voltage regulator, making it an excellent choice for application in a wide range of fields.

Application Fields

The ISL78235AARZ-T is capable of providing up to 1A of output current at 3.3V with very low quiescent current. This makes it an ideal choice for many different applications, such as automotive electronics, portable electronic devices, and industrial applications. Additionally, this differential amplifier design provides high power efficiency and allows for very low EMI/RFI emissions, making it suitable for applications in noisy environments. In automobile applications, the ISL78235AARZ-T can be used as an adjustable voltage regulator for controlling voltage levels in order to provide stable power to essential components. It can also be used to improve the efficiency of onboard automotive audio systems, providing lower heat emissions and higher power efficiency. Furthermore, it can be used to provide a stable power supply for voltage sensitive circuits, increasing the reliability and efficiency of vehicle electronics. In portable electronic devices, this device can serve as a buck regulator, providing stable power supply for processors, digital logic, and other components. Its low quiescent current enables portable devices to achieve longer battery life. Additionally, its small size is ideal for applications where board space is limited. In industrial applications, the ISL78235AARZ-T can serve as a voltage regulator to provide a low voltage supply for remote sensing and other monitoring devices, enabling reliable operation in harsh environmental conditions. It can also be used as an adjustable voltage regulator, providing precise regulation of motor speed and current control. This enables improved efficiency and consistency of manufacturing processes.

Working Principle

The ISL78235AARZ-T is a synchronous buck voltage regulator, which works by using a pair of MOSFETs to convert input voltage to a regulated output voltage. It has an internal error amplifier which compares the output voltage to a fixed reference voltage, and a pulse width modulator which adjusts the duty cycle of the converter based on the output of the error amplifier. The ISL78235AARZ-T’s pulse width modulator has adjustable switching frequency, adjustable soft start, and adjustable power good flag, providing increased flexibility and improved regulation accuracy. Additionally, the adjustable synchronous rectifiers improve efficiency and provide reduced switching losses. Furthermore, this device also has over-current, over-temperature, and undervoltage protections, allowing for safe operation in a wide range of temperature ranges and supply voltage conditions.

Conclusion

The ISL78235AARZ-T is a fully integrated, monolithic synchronous buck capacitive-input regulator, capable of providing up to 1A of output current at 3.3V. It is designed for a wide variety of applications, including automotive electronics, portable electronic devices, and industrial applications. Its features include programmable output voltage, adjustable soft-start, power-good flag, no-load, over-current and under voltage protection, and over temperature protection, making it an excellent choice for regulating voltage levels in a wide variety of fields. Its buck voltage regulation principle provides high power efficiency and low EMI/RFI emissions, enabling reliable operation in noisy environments.

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