PWM controller IC enables high density point-of-load regulators

3 May 2006 Power Electronics / Power Management

International Rectifier has introduced the IR3624, a 600 kHz single-phase synchronous buck PWM controller IC designed for high density, 10 A non-isolated point-of-load (POL) regulators used in networking and communications systems.

The higher 600 kHz switching frequency enables the use of a reduced footprint inductor and fewer output capacitors, saving board area. For example, says the company, when the new IR3624 is used with a pair of IR's small can DirectFET Hexfet Mosfets, such as the IRF6623 and IRF66636, a complete 10 A regulator can be made to fit into 200 mm² of board space.

For system robustness, the IR3624 features integrated thermal shutdown and programmable over-current limit protection. It includes a 0,6 V voltage reference, which allows a single POL regulator to support a wide variety of applications from ultra low-voltage DSPs to legacy 5 V logic. For applications below 5 A, even higher density can be achieved by using one SO-8 dual N-channel Hexfet Mosfet such as the IRF8910 to replace the two standalone Mosfets, says IR. This further shrinks board area to within 150 mm².

To meet the tracking requirements of the latest ASICs and FPGAs during start-up, the IR3624 can start-up with a pre-biased output voltage without discharging the output. This feature simplifies regulator design for both the core and I/O voltages. Under-voltage lockout and programmable soft start features further help to limit in-rush currents and ensure proper power up of the regulator.

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