NOT RECOMMENDED FOR
NEW DESIGN PLEASE USE
AP2146 OR AP2156
AP1212
DUAL USB HIGH-SIDE POWER SWITCH
Features
• Compliant to USB specifications
• Dual independent switches control
• 2.7V to 5.5V input voltage
• 500mA minimum continuous current per port
• 110mΩ typical on-resistance
• 1.25A maximum short circuit current limit
• Independent 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 under voltage lockout (UVLO)
• 1ms turn-on (soft-start) and fast turn-off
• Enable active-high (H) or active-low (L)
• SOP-8L: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
General Description
The AP1212 series are dual integrated high-side power switch
with independent enable and flag functions, optimized for
self-powered and bus-powered Universal Serial Bus (USB)
applications. The AP1212 series support 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 1000mA, well below the
UL 25VA safety requirements; and a flag output is available to
indicate fault conditions 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, under voltage
lockout (UVLO) to ensure that the device remains off unless there
is a valid input voltage present, and 3.3V and 5V logic compatible
enable inputs.
Applications
• USB hubs
• Hot plug-in power supplies
• Battery-charger circuits
Typical Application Circuit
Power
Supply
3.3V
5V
7
IN
0.1uF
AP1212
8
OUT1
USB
Control
2 FLG1
1
EN1
3
4 FLG2
EN2
5
OUT2
GND
6
Downstream
USB Ports
0.1uF
D+
D-
ferrite bead
VBUS
33uF
GND
ferrite bead
0.1uF
D+
D-
ferrite bead VBUS
33uF
GND
ferrite bead
AP1212 Rev. 8
DS31019
1 of 12
www.diodes.com
NOVEMBER 2010
© Diodes Incorporated