ISL6439IBZ-T

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The ISL6439IBZ-T is a high-efficiency, integrated boost-buck controller which incorporates an N-channel MOSFET that is capable of providing up to 28V of output from an input voltage rail ranging from 4.5V to 20V in battery-powered systems. It is designed for both step-up and step-down operations, delivering a wide input and output dynamic range to meet the varying power requirements of different applications.

The ISL6439IBZ-T is integrated with a variety of features to help reduce overall design complexity and cost. It includes a variable frequency voltage mode control which provides excellent transient response times and excellent light load efficiency. It also features two mode programming which allows for flexible design optimization based on load conditions. Additionally, a pulse skipping mode decreases switching losses, further boosting efficiency.

In addition, the ISL6439IBZ-T integrates protection features such as over-current protection, soft start, over voltage protection, and thermal shutdown. This ensures safe and reliable operation in any application.

Application Field

The ISL6439IBZ-T is ideal for a wide range of applications, including battery-operated mobile devices, distributed power architectures, DC-DC converters, isolated power supplies, portable instrumentation, and notebook and desktop PCs.

It can be used in a variety of step-up or step-down DC-DC applications that require a high level of efficiency across light loads and varying input and output voltage conditions. However, it is particularly well-suited for systems that require low noise performance and EMI/EMC compliance.

Working Principle

The ISL6439IBZ-T operates by using pulse-width modulation (PWM) to control the duty cycles of switch transistors. A simple block diagram is shown below to illustrate the basic operation of the controller. When the voltage is lower than the sample threshold voltage, the oscillator circuit generates a switching pulse and the switching transistor connects the input voltage to the inductor. During this period, energy is stored in the inductor, which is then released to the output when the switching transistor is turned off.

When the output voltage reaches its set point, the oscillator circuit stops, and the output voltage is regulated by the error amplifier. When the voltage is above the sample threshold voltage, the controller will operate in the same manner, but with the switch transistor disconnecting the inductor from the input voltage. In this way, the ISL6439IBZ-T can operate in both boost and buck operating modes.

To ensure that the ISL6439IBZ-T works within its specified parameters, it includes a variety of features such as frequency ramped soft-start and adjustable dead time. The frequency ramped soft-start reduces inrush current at startup, thus protecting downstream components from over current conditions. The adjustable dead time allows for optimized switching frequencies for different load conditions, improving efficiency and reducing power losses.

In addition, the ISL6439IBZ-T also provides various protection features such as over-current protection, over voltage protection, over-temperature protection, and short circuit protection. These features help to ensure safe and reliable operation in any application.

The ISL6439IBZ-T is a high-efficiency integrated boost-buck controller designed for use in a variety of applications. Its variable frequency voltage mode control provides excellent transient response times and low noise operation. Its two-mode programming, pulse skipping mode, and various protection features make it suitable for a variety of step-up and step-down DC-DC applications including those that require low noise performance and EMI/EMC compliance.

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