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MIC2545A

Programmable Current-Limit High-Side Switch

Micrel 

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 current-

limit, 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

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Typical Application

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

June 2011

M9999-062711-A

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