ISL6440IA-T

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The ISL6440IA-T is a monolithic integrated circuit (IC) designed to control DC-DC converters with synchronous rectification. This IC is a DC-DC controller that, in combination with a synchronous switching MOSFET, safely configures and implements a variety of synchronous rectification topologies. It offers better efficiency than other types of conventional synchronous rectification strategies. The ISL6440IA-T comes in a compact 8-pin DIP package.

Application Field

The ISL6440IA-T was designed for use in high-current applications often found in personal-care and home-care appliances, industrial motor drivers and point-of-load DC/DC converters. It enables lower temperature rise, fewer components and improved reliability when used with a MOSFET power stage.

Working Principle

The ISL6440IA-T is an integrated, synchronous DC-DC converter controller with an internal pulse-width modulation (PWM) generator. It requires only two external components: the power MOSFET and the blocking diode. The internal oscillator operates at 1MHz to make the switching frequencies of the synchronous rectifier higher than the PWM frequency, allowing the MOSFET to switch at high frequencies, thus reducing the conduction losses. The IC also includes a start-up circuit to power cycle the IC when the output voltage drops below the set point voltage.

The IC has four pins for setting the topology of the synchronous rectifier, the operating frequency, the voltage drop of the MOSFET and the set point voltage. The IC has a very low output voltage ripple and is capable of driving up to 10A onto the output capacitors. The IC has various protection features, including over-temperature protection, under-voltage protection and cycle-by-cycle current limitation.

Conclusion

The ISL6440IA-T is highly integrated in order to reduce the component count and improve the efficiency of the power supply. It is suitable for applications where high current and low ripple voltage are required. It is not limited to power supplies, but can be used in any device requiring synchronous rectification, such as LED lighting and motor control. The ISL6440IA-T provides excellent features, including protection features and a low output voltage ripple.

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