MIC2544A/2548A Programmable Current Limit High-Side Switch General Description Features The MIC2544A and MIC2548A are integrated, high-side 2.7V to 5.5V input power switches optimized for low loss DC power switching Adjustable current-limit up to 1.5A and other power management applications, including Reverse current flow blocking (no body diode) Advanced Configuration and Power Interface (ACPI). 90A typical on-state supply current The MIC2544A/48A is a cost-effective, highly integrated solution that requires few external components to satisfy 1 A typical off-state supply current USB and ACPI requirements. 120m maximum on-resistance Load current management features include a precision Open-drain fault flag resistor-programmable output current-limit and a soft-start Thermal shutdown circuit which minimizes inrush current when the switch is Thermal shutdown output latch (MIC2548A) enabled. Thermal shutdown, along with current-limit, 2ms (slow) turn-on and fast turn-off protects the switch and the attached device. Available with active-high or active-low enable The MIC2544A/48As open-drain flag output is used to indicate current-limiting or thermal shutdown to a local controller. The MIC2548A has an additional internal latch Applications which turns the output off upon thermal shutdown providing robust fault control. The enable signal is USB power distribution compatible with both 3V and 5V logic, and is also used as PCI bus power switching the thermal shutdown latch reset for the MIC2548A Notebook PC The MIC2544A and MIC2548A are available in active-high ACPI power distribution and active-low enable versions in the 8-pin SOIC PC card hot swap applications (small-outline integrated circuit) and 8-pin MSOP (micro- Inrush current-limiting small-outline package). Typical Application Typical Advanced Configuration and Power Interface (ACPI) Application Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2544A/2548A Ordering Information* Part Number Enable Latch* Temperature Range Package Pb-Free MIC2544A-1YM Active High -40C to +85C 8-pin SOIC MIC2544A-1YMM Active High 8-pin MSOP -40C to +85C MIC2544A-2YM Active Low -40C to +85C 8-pin SOIC MIC2544A-2YMM Active Low 8-pin MSOP -40C to +85C MIC2548A-1YM Active High -40C to +85C 8-pin SOIC MIC2548A-1YMM Active High 8-pin MSOP -40C to +85C MIC2548A-2YM Active Low -40C to +85C 8-pin SOIC MIC2548A-2YMM Active Low -40C to +85C 8-pin MSOP *Thermal Shutdown Latch M9999-043010 April 2010 2