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Buck control IC supports single, two outputs

Posted: 18 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous buck control ICs? POL buck converters? filter capacitors?


International Rectifier has released two dual-channel synchronous buck control ICs with integrated high-performance drivers for medium- to high-current POL buck converters used in networking, computing and communications systems.

The IR3622MPbF and IR3622AMPbF can be configured to support a single output in current share mode, capable of delivering up to 80A or support two independent outputs. The independent channels run 180 out of phase and reduce the required input capacitance requirement. Moreover, a significant reduction in output ripple voltage is achieved in single output mode, said IR.

IR3622MPbF targets 12V single input applications while the IR3622AMPbF supports 5V and 12V applications. Key protection features include selectable hiccup or latched current limit, pre-bias start-up, thermal shutdown protection and under- and overvoltage protection.

The devices feature a programmable switching frequency up to 600kHz to reduce I/O filtering requirements. This minimizes the size and number of external filter capacitors and inductors needed. Available in a 32-lead MLPQ package, the new ICs also feature two independently programmable soft-start functions to allow system level sequencing of output voltages in various configurations critical for system level start-up.

The IR3622 family may be used in multirail applications that require sophisticated power-up and power-down tracking and sequencing of multiple rails by offering a combination of track, sequencing, enable and "power good" output features that can be used to trigger a sequential rise of output voltages across multiple POL converters.

Two reference designs are available: the IRDC3622S for single output (dual phase) and the IRDC3622D for dual output.

The IR3622MPbF, IR3622MTRPbF, IR3622AMPbF and IR3622AMTRPbF devices are priced at $1.90 each in quantities of 10,000 pieces. Production orders are available immediately.

- Gina Roos

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