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MIC2526-1BM

Dual USB Power Control Switch

Micrel 

MIC2526

Micrel

MIC2526

Dual USB Power Control Switch

Not Recommended for New Designs

Refer to MIC2026

General Description

The MIC2526 is a dual integrated high-side power switch with

independent enable and flag functions, optimized for self-

powered and bus-powered Universal Serial Bus (USB) appli-

cations. Few external components are necessary to satisfy

USB requirements.

The MIC2526 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 MIC2526 is available in active-high and active-low ver-

sions in 8-pin DIP and SOIC packages.

Features

• Compliant to USB specifications

• UL Recognized Component

• 2 independent switches

• 3V to 5.5V input

• 500mA minimum continuous load current per port

• 140mΩ maximum on-resistance

• 1.25A maximum short circuit current limit

• Individual 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 host 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

Data

10k

10k

3.3V USB Controller

VIN

ON/OFF

1µF OVERCURRENT

OVERCURRENT

ON/OFF

100k

100k

MIC2526-2

ENA

FLGA

FLGB

ENB

OUTA

IN

GND

OUTB

VCC

5.0V

47µF

0.1µF

47µF

Ferrite

Beads

VBUS

D+

D–

GND

VBUS

D+

D–

GND

2-Port USB Self-Powered Hub

Data

(Two Pair)

to USB

Controller

USB

Port 1

USB

Port 2

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

February 2000

1

MIC2526

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