MIC2524 查看數據表（PDF） - Micrel

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MIC2524

Quad USB Power Control Switch Not Recommended for New Designs

Micrel 

MIC2524/2527

General Description

The MIC2524 and MIC2527 are cost-effective high-side

power switches with four independently controlled channels,

optimized for self-powered and bus-powered Universal Se-

rial Bus (USB) applications. Few external components are

necessary to satisfy USB requirements.

The MIC2524/7 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 MIC2524/7 is available in active-high and active-low

versions in 16-pin DIP and SOIC packages.

Micrel

MIC2524/2527

Quad USB Power Control Switch

Not Recommended for New Designs

Refer to MIC2027

Features

• Compliant to USB specifications

• UL Recognized Component

• 4 independent switches

• 3V to 5.5V input

• 500mA minimum continuous load current per port

• 140mΩ maximum on-resistance (MIC2524)

• 1.25A maximum short circuit current limit

• Individual open-drain fault flag pins

• 220µA 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

• 16-pin SOIC and DIP packages

Applications

• USB bus-powered hubs

• USB self-powered hubs

• USB monitors

• USB printers

Typical Application

MIC2527

5.1V ± 3%

5V ± 1%

or

MIC2524

5V ±3%

MIC5207-3.3

LDO Regulator

IN

OUT

4.7

µF

GND

10k

3.3V USB Controller

V+

ON/OFF

1µF OVERCURRENT

D+

D– GND

Bold lines indicate

0.1" wide, 1-oz. copper

high-current traces.

* 33µF, 16V tantalum or 100µF, 10V electrolytic per port

27k

MIC2524

MIC2527

ENA

IN

FLGA

IN

ENB OUTA

FLGB OUTB

ENC OUTC

FLGC OUTD

END GND

FLGD GND

33µF*

0.1

µF

33µF*

33µF*

33µF*

Ferrite

Bead

0.01µF

VBUS

D+

D–

GND

0.01µF

VBUS

D+

D–

GND

0.01µF

VBUS

D+

D–

GND

0.01µF

VBUS

D+

D–

GND

Downstream

USB

Port 1

500mA max.

Downstream

USB

Port 2

500mA max.

Downstream

USB

Port 3

500mA max.

Downstream

USB

Port 4

500mA max.

UL Recognized Component

4-Port Self-Powered Hub

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

June 1999

1

MIC2524/2527

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