TPS2505

SPAS093A – DECEMBER 2009 – REVISED FEBRUARY 2010

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FAULT1/2

FAULT1/2 are open-drain outputs that indicate when the USB switches are in an overcurrent or over-temperature

Over-temperature conditions bypass the internal delay period and assert/de-assert the FAULT1/2 output

ENUSB1/2

ENUSB1/2 are logic-level inputs that enable the USB switches. Pull ENUSB1/2 above 1 V to enable the USB

switches and below 0.7 V to disable the USB switches. ENUSB1/2 only enables the USB switches. The boost

converter is independent of ENUSB1/2 and continues to operate even when ENUSB disables the USB switch.

USB1/2

USB1/2 are the outputs of the USB switches and should be connected to the USB connectors to provide USB

power. Although the device does not require it for operation, a bulk capacitor may be connected from USB to

PGND to meet USB standard requirements. See the latest USB 2.0 specification for further details.

AUX

AUX is the boost converter output and provides power to the USB switches and to any additional load connected

to AUX. Internal feedback regulates AUX to 5.1 V. Connect a 22-µF ceramic capacitor from AUX to PGND to

filter the boost converter output. See COMPONENT RECOMMENDATIONS for further details. Additional external

load can be connected to AUX as long as the total current drawn by the USB switches and external load does

not overload the boost converter. See Determining the Maximum Allowable AUX and USB1/2 Current for details.

SW

SW is the internal boost converter connection of the low-side N-channel MOSFET drain and the high-side

P-channel drain. Connect the boost inductor from IN to SW close to the device to minimize parasitic effects on

the device operation.

THERMAL PAD

The thermal pad connection is used to heat-sink the device to the printed-circuit board (PCB). The thermal pad

may not be connected externally to a potential other than ground because it is connected to GND internally. The

thermal pad must be soldered to the PCB to remove sufficient thermal energy in order to stay within the

recommended operating range of the device.

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