MOSFET regulator reduces component count

28th February 2017
Alice Matthews

An easy-to-use, fully integrated and highly efficient DC/DC regulator has been introduced by Infineon Technologies. The IR3883 aims at high density Point of Load applications where high efficiency, high reliability and good thermal behaviour are required. The device is suitable for NetCom, telecom, servers and storage solutions.

The voltage regulator employs an enhanced stability engine that makes it stable with ceramic capacitors without compensation for an easy design. Other solutions require extra components for stability and for ripple injection. Thus, the IR3883 can save up to five components and facilitates the layout for small PCB size of less than 100 mm2.

The IR3883 provides up to 3A continuous current from 4.5-14V in a small 3x3mm PQFN package. It can enter diode emulation mode during light-loads to save power. Moreover, it can enter a low quiescent current mode making it useful for standby power supplies to fulfill energy savings regulations. DCM can be disabled for applications requiring low ripple or to avoid interference/beat frequency. The precise output voltage allows accurate output voltage from 0.5-5V. A thermally compensated internal current limit with three selectable levels overcomes the need to oversize the inductor and saves a resistor.

This gives a more overall robustness because digital OCSET eliminates false trips from external noise and simplifies layout. The footprint is optimised for easy layout as well. For example, PVIN/PGND and SW/BOOT are adjacent for bypass capacitors placement and less noise and easier design. The IR3883 also features all protection functions required for enterprise: pre-bias startup, thermal shutdown, over current protection, internal soft-start, enable pin and power GOOD output.

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