MIC2525 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – USB Power Control Switch Not Recommended for New Designs

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 V_BUS
100mA max.
V_BUS
D+
D–
GND
MIC5207-3.3
IN
OUT
1µF
GND
3.3V
10k
3.3V USB Controller
VIN
ON/OFF
1µF ^OVERCURRENT
GND
100k
V_CC
5.0V
MIC2525-2
EN
FLG
GND
NC
OUT
IN
OUT
NC
150µF
Ferrite
Beads
V_BUS
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 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2000
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MIC2525