MIC2525 데이터 시트보기 (PDF) - Micrel

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MIC2525

USB Power Control Switch

Micrel 

MIC2525

Micrel

MIC2525

USB Power Control Switch

Not Recommended for New Designs

Refer to MIC2025

General Description

The MIC2525 is an integrated high-side power switch, opti-

mized for self-powered and bus-powered Universal Serial

Bus (USB) applications. Few external components are nec-

essary to satisfy USB requirements.

The MIC2525 satisfies the following USB requirements: each

switch channel supplies up to 500mA as required by USB

downstream devices; the switch’s low on-resistance meets

USB voltage drop requirements; fault current is limited to

typically 750mA, well below the UL 25VA safety require-

ments; and a flag output is available to indicate fault condi-

tions 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,

undervoltage lockout (UVLO) to ensure that the device re-

mains off unless there is a valid input voltage present, and

3.3V and 5V logic compatible enable inputs.

The MIC2525 is a UL recognized component and is available

in active-high and active-low versions in 8-pin DIP and SOIC

packages.

For new designs, please see the MIC2025/2075.

Features

• Compliant to USB specifications

• UL Recognized Component

• 3V to 5.5V input

• 500mA minimum continuous load current per port

• 140mΩ maximum on-resistance

• 1.25A maximum short circuit current limit

• Open-drain fault flag pins

• 110µA typical on-state supply current

• 1µA typical off-state supply current

• Output can be forced higher than input (off-state)

• Thermal shutdown

• 2.4V typical undervoltage lockout (UVLO)

• 1ms turn-on (soft-start) and fast turnoff

• Active-high or active-low enable versions

• 8-pin SOIC and DIP packages

Applications

• USB hosts and self-powered hubs

• USB bus-powered hubs

• Hot plug-in power supplies

• Battery-charger circuits

Typical Application

4.50V to 5.25V

Upstream VBUS

100mA max.

VBUS

D+

D–

GND

MIC5207-3.3

IN

OUT

1µF

GND

3.3V

10k

3.3V USB Controller

VIN

ON/OFF

1µF OVERCURRENT

GND

100k

VCC

5.0V

MIC2525-2

EN

FLG

GND

NC

OUT

IN

OUT

NC

150µF

Ferrite

Beads

VBUS

D+

D–

GND

0.1µF

USB

Port

Data

Data

Single-Port USB Self-Powered Hub

UL Recognized Component

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

January 2000

1

MIC2525

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