ISL6439AIR

Frequency - Switching:	600kHz
Base Part Number:	ISL6439
Supplier Device Package:	16-QFN-EP (5x5)
Package / Case:	16-VQFN Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Phase Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.97 V ~ 3.63 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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ISL6439AIR Application Field and Working Principle

Introduction

The ISL6439AIR is a single-channel, synchronous buck controller designed for applications requiring multiple outputs. It is a low-cost, low operating voltage controller for high-performance DC-DC switching regulator applications. In addition, the ISL6439AIR is ideal for use in battery charging applications and in industrial and computer applications where high efficiency and low output noise is a must. The ISL6439AIR offers advanced features, such as programmable slew rate, soft-start and more.

Application Field

DC-DC switching controllers are used in a wide range of applications that require an efficient way to convert one DC voltage to another. The ISL6439AIR is an ideal choice for use in a variety of applications, including battery charging, industrial and computer applications where high efficiency and low output noise is required. It features a low operating voltage, low cost, and programmable slew rate, enabling designers to create a reliable and cost-effective regulator solution. The ISL6439AIR is also extremely versatile and can be used to implement various topologies, such as synchronous buck, SEPIC, and flyback. For example, the synchronous buck topology provides higher output current capability than traditional buck regulators while using a smaller footprint. On the other hand, the SEPIC topology allows the regulator to generate an output voltage that is either higher or lower than the input voltage, depending on the needs of the application. Finally, the flyback topology is suitable for applications where high voltage isolation is required and where the current capability of the synchronous buck is not sufficient.

Working Principle

The ISL6439AIR uses PWM control in order to regulate the output voltage. This is done by varying the duty cycle of a PWM comparator in order to change the amount of energy delivered to the load. The ISL6439AIR features a programmable slew-rate of up to 900kHz, allowing for fast transient response. In addition, the ISL6439AIR offers an adjustable soft-start feature which allows for a smooth start-up of the output voltage. In order to regulate the output voltage, the ISL6439AIR operates in a closed loop fashion. A voltage feedback is taken from the output of the regulator and the error amplifier compares the feedback voltage with a specified reference voltage. The error amplifier then produces an output which is sent to the PWM comparator. This PWM comparator then modulates the duty cycle in order to regulate the output voltage.When the load current is low, the ISL6439AIR uses a “burst mode” in order to maintain high efficiency during light load conditions. In this mode, it automatically reduces the switching frequency in order to reduce switching losses. This allows the ISL6439AIR to deliver a high level of efficiency over a wide operating range. Finally, the ISL6439AIR features two soft-stop features that allow the output voltage to be gently ramped down when the load is removed. This prevents the supply voltage from overshooting when the load is removed.

Conclusion

The ISL6439AIR is an excellent choice for a variety of DC-DC switching regulator applications. It offers advanced features such as programmable slew-rate and adjustable soft-start, as well as superior efficiency over a wide operating range. In addition, the ISL6439AIR is suitable for use in a range of topologies, including synchronous buck, SEPIC and flyback. Finally, its two soft-stop features offer a reliable way to ramp the output voltage down when the load is disconnected.

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