ISL6420AIR-TK

Frequency - Switching:	100kHz ~ 1.4MHz
Base Part Number:	ISL6420A
Supplier Device Package:	20-QFN-EP (4x4)
Package / Case:	20-VFQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control, Phase Control, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	5.6 V ~ 28 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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ISL6420AIR-TK Application Field and Working Principle

The ISL6420AIR-TK is a high-efficiency, ultra-small synchronous buck controller from Intersil Corp., which is a provider of innovative power integrated circuits. It features best-in-class current mode PWM performance and is offered in a tiny 3 mm x 3 mm, 10-pin thin QFN package. The controller is designed to work over an input voltage range of 2.375 to 12V, making it suitable for a wide range of applications such as powering system peripherals, point-of-load regulation and audio subsystems.The ISL6420AIR-TK includes an integrated low-side power MOSFET and a feedback voltage error amplifier. The output voltage is controlled through a current mode feedback loop, creating low distortion and low output ripple. This results in a very high efficiency in all operating conditions. The ISL6420AIR-TK also includes a wide range of protection features, ensuring reliable operation and improving overall system safety.The controller also offers a unique feature called Flexible Operating Mode. This allows the user to choose between pulse frequency modulation and pulse width modulation operation mode. The pulse frequency modulation mode allows an accurate output voltage to be maintained over a wide input voltage range, while the pulse width modulation mode offers reduced output ripple.The ISL6420AIR-TK is designed for use in a variety of power supply applications, such as powering system peripherals, powering point-of-load regulation and audio subsystems, and for post-regulator applications. It also offers a wide range of features that make it ideal for a variety of applications, such as its fast transient response, low noise operation, improved efficiency, wide input voltage range and programmable over-current protection. The ISL6420AIR-TK works by using a voltage error amplifier to monitor the output voltage and drive a power MOSFET. The voltage error amplifier is connected to the feedback pin and is used to compare the actual output voltage to the programming voltage. The output voltage is maintained by varying the power MOSFET’s switching frequency in proportion to the difference between the programmed voltage and the actual voltage. The controller includes an internal compensation network that allows the user to set the loop bandwidth and loop stability. The device also features an internal voltage reference that can be externally adjusted, allowing the user to set the output voltage within a range of 1V to 6V. Additionally, the controller can be programmed to operate in either pulse frequency modulation or pulse width modulation mode. Finally, the ISL6420AIR-TK offers programmable over-current protection and thermal protection. The programmable over-current protection allows the user to set the peak current limit for the output stage, ensuring that current is limited to safe levels. The thermal protection feature ensures that the power MOSFET remains at safe temperatures, ensuring reliable operation. In conclusion, the ISL6420AIR-TK is an ideal choice for powering system peripherals, powering point-of-load regulation and audio subsystems, and post-regulator applications. It provides the user with an excellent combination of performance, integration, and flexibility, making it a great choice for those looking for a high-efficiency and small-sized synchronous buck controller.

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