MIC2526 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – Dual USB Power Control Switch Not Recommended for New Designs

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 V_BUS
100mA max.
V_BUS
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
V_CC
5.0V
47µF
0.1µF
47µF
Ferrite
Beads
V_BUS
D+
D–
GND
V_BUS
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 [phone] • fax + 1 [phone] • http://www.micrel.com
February 2000
1
MIC2526