Programmable Current Limit High-Side Switch

Microchip's MIC2544A and MIC2548A are integrated, high-side power switches optimized for low loss DC power switching

Image of Micrel's Programmable Current Limit High-Side SwitchMicrel's MIC2544A and MIC2548A are integrated, high-side power switches that are optimized for low loss DC power switching and other power management applications, including advanced configuration and power interface (ACPI). The MIC2544A/48A is a cost-effective, highly integrated solution that requires few external components to satisfy USB and ACPI requirements.

Load current management features include a precision resistor-programmable output current-limit and a soft-start circuit that minimizes inrush current when the switch is enabled. Thermal shutdown, along with current-limit, protects the switch and the attached device.

The MIC2544A/MIC2548A open-drain flag output is used to indicate current-limiting or thermal shutdown to a local controller. The MIC2548A has an additional internal latch that turns the output off upon thermal shutdown, providing robust fault control. The enable signal is compatible with both 3V and 5V logic and is also used as the thermal shutdown latch reset for the MIC2548A.

Features
  • 2.7V to 5.5V input
  • Adjustable current-limit up to 1.5A
  • Reverse current flow blocking (no “body diode”)
  • 90µA typical on-state supply current
  • 1μA typical off-state supply current
  • 120mΩ maximum on-resistance
  • Open-drain fault flag
  • Thermal shutdown
  • Thermal shutdown output latch (MIC2548A)
  • 2ms (slow) turn-on and fast turn-off
  • Available with active-high or active-low enable

Programmable Current Limit High-Side Switch

ImageManufacturer Part NumberDescriptionAvailable Quantity
MIC2548A-1YM datasheet linkIC SW CURR LIMIT HI SIDE 8SOICMIC2548A-1YMIC SW CURR LIMIT HI SIDE 8SOIC1785 - Immediate
MIC2548A-1YM product page link
MIC2544A-1YM datasheet linkIC SW CURR LIMIT HI SIDE 8SOICMIC2544A-1YMIC SW CURR LIMIT HI SIDE 8SOIC4180 - Immediate
MIC2544A-1YM product page link
MIC2544A-2YM datasheet linkIC SW CURR LIMIT HI SIDE 8SOICMIC2544A-2YMIC SW CURR LIMIT HI SIDE 8SOIC0MIC2544A-2YM product page link
MIC2548A-2YMM datasheet linkIC SW CURR LIMIT HI SIDE 8MSOPMIC2548A-2YMMIC SW CURR LIMIT HI SIDE 8MSOP0MIC2548A-2YMM product page link
MIC2544A-1YMM datasheet linkIC SW CURR LIMIT HI SIDE 8MSOPMIC2544A-1YMMIC SW CURR LIMIT HI SIDE 8MSOP0MIC2544A-1YMM product page link
MIC2544A-2YMM datasheet linkIC SW CURR LIMIT HI SIDE 8MSOPMIC2544A-2YMMIC SW CURR LIMIT HI SIDE 8MSOP0MIC2544A-2YMM product page link
MIC2548A-1YMM datasheet linkIC SW CURR LIMIT HI SIDE 8MSOPMIC2548A-1YMMIC SW CURR LIMIT HI SIDE 8MSOP0MIC2548A-1YMM product page link
MIC2548A-2YM datasheet linkIC SW CURR LIMIT HI SIDE 8SOICMIC2548A-2YMIC SW CURR LIMIT HI SIDE 8SOIC0MIC2548A-2YM product page link
Published: 2011-01-05