Configurable dual-phase PWM buck control ICs

19 September 2007 Power Electronics / Power Management

International Rectifier has introduced two dual-channel synchronous buck control ICs with integrated high performance drivers for medium to high current point-of-load (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 80 A, or to support two independent outputs. The independent channels run 180° out of phase, and reduce the required input capacitance requirement. A significant reduction in output ripple voltage is achieved in single output mode.

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

The devices feature a programmable switching frequency up to 600 kHz to reduce input and output filtering requirements, and minimise 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 is well suited to 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.

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