High performance dual output PWM-drivers

21 September 2005 Power Electronics / Power Management

The IR3621M and IR3621F are voltage-mode, dual output bi-phase synchronous buck controller-driver ICs for high performance point-of-load (POL) converters. The IR3621 includes a full suite of power management features, including pre-bias protection, sequencing capability, hiccup current limit protection and tight voltage reference accuracy. For 12 V input, 2,5 V output, the IR3621M converter achieves up to 86% efficiency at 15 A full load and 400 kHz switching frequency when used with two optimised Hexfet MOSFETs. Typical applications include powering dual-logic ASICs, DDR memory power management or other multirail or two-phase requirements. The IR3621M (32-pin MLPQ package) provides ±1% output voltage accuracy, and the IR3621F (28-lead TSSOP package) provides ±1,35% output voltage accuracy. Both provide pre-bias protection, and are suited for non-isolated 0,8 V to 3,3 V output DC-DC POL converters with either dual output rails up to 15 A each, or single output rails up to 30 A. The IRDC3621 Design Kit demonstrates the complete DC-DC converter performance.

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