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MIC2549A

Micrel Semiconductor
Part Number MIC2549A
Manufacturer Micrel Semiconductor
Description Programmable Current Limit High-Side Switch
Published Mar 28, 2018
Detailed Description MIC2545A/2549A Programmable Current-Limit High-Side Switch General Description The MIC2545A and MIC2549A are integrated...
Datasheet PDF File MIC2549A PDF File

MIC2549A
MIC2549A

Overview
MIC2545A/2549A Programmable Current-Limit High-Side Switch General Description The MIC2545A and MIC2549A are integrated high-side power switches optimized for low-loss DC power switching and other power-management applications, including advanced configuration and power interface (ACPI).
The MIC2545A/49A 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, which minimizes inrush current when the switch is enabled.
Thermal shutdown, along with adjustable currentlimit, protects the switch and the attached device.
The MIC2545A/49A’s open-drain flag output is used to indicate current-limiting or thermal shutdown to a local controller.
The MIC2549A has an additional internal latch which 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 MIC2549A.
The MIC2545A and MIC2549A are available in active-high and active-low enable versions in 8-pin DIP, SOIC, and TSSOP packages.
Data sheets and support documentation can be found on Micrel’s web site at: www.
micrel.
com.
Features • 2.
7V to 5.
5V input • Adjustable current-limit up to 3A • Reverse current flow blocking • 90µA typical on-state supply current • 1µA typical off-state supply current • 50mΩ maximum on-resistance • Open-drain fault flag • Thermal shutdown • Thermal-shutdown output latch (MIC2549A) • 2ms (slow) soft-start turn-on, fast turnoff • Available with active-high or active-low enable Applications • USB power distribution • PCI Bus Power Switching • Notebook PC • ACPI power distribution • PC card hot swap applications • Inrush current-limiting _________________________________________________________________________________________________________________________ Typical Applicati...


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