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.
Features
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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
USB hosts and self-powered hubs
USB bus-powered hubs
Hot plug-in power supplies
Battery-charger circuits
Applications
For new designs, please see the MIC2025/2075.
Typical Application
V
CC
5.0V
4.50V to 5.25V
Upstream V
BUS
100mA max.
V
BUS
D+
D–
GND
1µF
3.3V
10k
3.3V USB Controller
VIN
ON/OFF
OVERCURRENT
GND
100k
MIC2525-2
EN
FLG
GND
NC
OUT
IN
OUT
NC
0.1µF
150µF
Ferrite
Beads
V
BUS
D+
D–
GND
USB
Port
MIC5207-3.3
IN
OUT
GND
1µF
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
MICREL [ MICREL SEMICONDUCTOR ]
