MIC2537

MIC2537 Micrel MIC2537 Quad Power Distribution Switch Final Information General Description The MIC2537 is a cost-effective high-side power switch with four independently controlled channels, optimized for buspowered Universal Serial Bus (USB) applications. Few external components are necessary to satisfy USB requirements. The MIC2537 satisfies the following USB requirements: each switch channel supplies up to 100mA as required by USB bus-powered downstream devices; fault current is limited to typically 250mA, well below the UL 25VA safety requirements; and a flag output is available to indicate fault conditions to the local USB controller. Soft start eliminates the momentary voltage drop on the upstream port that may occur when the switch is enabled in bus-powered applications. Additional features include thermal shutdown to prevent catastrophic switch failure from high-current loads and 3.3V and 5V logic compatible enable inputs. The MIC2537 is available in active-high and active-low versions in a 16-lead SOP package. Features Compliant to USB specifications 3V to 5.5V input 100mA minimum continuous load current per port 425mΩ typical on-resistance < 400mA current limit Individual open-drain fault flag leads 3V/5V-compatible enable inputs Active-high (-1) and active-low (-2) versions 100µA max. on-state supply current <1µA typical off-state supply current 16-lead SOP package –40°C to 85°C operation Applications USB keyboards USB bus-powered do...