TPS2500 datasheet(5/43 Pages) TI2

5 / 43 page

PGND

GND

ENUSB

FAULT

USB

AUX

ILIM

Thermal

Pad

DRCPackage

(TopView)

P0051-03

TPS2500, TPS2501

www.ti.com

SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010

PIN DESCRIPTIONS

SIGNAL

TYPE(1)

DESCRIPTION

NAME

NO.

AUX

Fixed 5.1-V boost converter output. Connect a low-ESR ceramic capacitor from AUX to PGND.

Enable input for boost converter. Tie to IN to enable.

ENUSB

Enable input for the USB switch. Tie to IN or AUX to enable.

FAULT

Active-low USB fault indicator (open-drain)

GND

Control/logic ground. Must be tied to PGND close to the IC externally.

ILIM

Program the nominal USB-switch current-limit threshold with a resistor to GND.

Input supply voltage for boost converter

PGND

Source connection for the internal low-side boost-converter power switch. Connect to GND with a

low-impedance connection to the input and output capacitors.

Boost and rectifying switch input. This node is switched between PGND and AUX. Connect the boost

inductor from IN to SW.

USB

Output of the USB power switch. Connect to the USB port.

Thermal

—

Must be soldered to achieve appropriate power dissipation. Connect to GND.

pad

(1)

I = input; O = output; P = power

AUX

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

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

the boost converter output. See the Component Recommendations section for further details. Additional external

load can be connected to AUX as long as the total current drawn by the USB switch and external load does not

overload the boost converter. See the Determining the Maximum Allowable AUX and USB Current section for

details.

EN is a logic-level input that enables the boost converter. Pull EN above 1 V to enable the device and below 0.7

V to disable the device. EN also disables the USB switch, because the USB switch cannot be run when the

boost converter is disabled.

ENUSB

ENUSB is a logic-level input that enables the USB switch. Pull ENUSB above 1 V to enable the USB switch and

below 0.7 V to disable the USB switch. ENUSB only enables the USB switch. The boost converter is

independent of ENUSB and continues to operate even when ENUSB disables the USB switch.

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