ISL6551IB-T

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The ISL6551IB-T is a pulse width modulation (PWM) controller used in DC/DC switching regulator applications. It is designed to switch up to four channels of buck, boost, or inverting buck-boost converters, and can be configured for a wide range of output voltages and currents. The ISL6551IB is programmable with a variety of features such as switching frequency, PWM dimming, output voltage and current protection, and pulse skip mode for light load efficiency.

The ISL6551IB is designed for use in a wide range of applications, such as portable system power management, LED lighting and displays, automotive power supplies, and industrial equipment. The controller is optimized for pulse skip frequency modulation operating mode, allowing users to achieve Extended temperature range and EMI compliance. It also offers optional spread spectrum frequency modulation to reduce EMI noise.

The ISL6551IB is capable of controlling two high-side power MOSFETs and one low-side power MOSFET. The controller is optimized for step-up, buck-boost, buck, boost, and inverting buck-boost regulators. It includes an integrated voltage-mode control loop that automatically provides stable output regulation of an adjustable switching frequency. By using a closed-loop control methodology, the user is able to specify the voltage that is output from the regulator with a single external resistor, providing improved accuracy and load regulation.

The ISL6551IB is designed for medium current applications up to 2.4A in a thermally enhanced 10-pin LLP package. It is designed to operate over a 4.5V to 20V input voltage range and can provide up to 5V of output voltage. The ISL6551IB features an integrated drive stage to drive the remote power MOSFETs, and a built-in delay time control circuit to optimize performance of the PWM control circuit, providing improved transient response and start-up accuracy.

The ISL6551IB includes a programmable peak current compensation circuit that can be used to optimize efficiency at light loads, as well as a quiescent current monitoring circuit, allowing the user to optimize efficiency across the full load range. Additionally, the ISL6551IB includes a programmable Soft-Start function to reduce inrush current during start-up.

The ISL6551IB includes a built-in cycle-by-cycle current limit, which provides the user with the ability to set an output current limit and overcurrent protection. The ISL6551IB also features an integrated temperature rise and over-temperature protection circuit, which shuts down the system if the die temperature increases beyond the programmed temperature limit.

The ISL6551IB also features an integrated power-good (PG) output to indicate when the output voltage is within the specified range. The PG output can be used to signal the system power supply monitoring circuit when the system is powered up and ready for operation.

In summary, the ISL6551IB is a controller used for buck, boost, and inverting buck-boost converter applications. It is optimized for step-up, buck-boost, buck, boost, and inverting buck-boost regulators and includes several features such as programmable frequency and dimming, output voltage and current protection, pulse skip mode, temperature protection, and power-good output. The ISL6551IB is well-suited for use in industrial, automotive, and portable power applications.

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