TPS2110A

TPS2111A

SBVS043 − MARCH 2004

www.ti.com

6

TRUTH TABLE

D1

D0

VI(VSNS) > 0.8V

VI(IN2) > VI(IN1)

OUT(1)

0

0

X

X

IN2

0

1

YES

X

IN1

0

1

NO

NO

IN1

0

1

NO

YES

IN2

1

0

X

X

IN1

1

1

X

X

Hi-Z

X = Don’t care.

(1)The under-voltage lockout circuit causes the output to go Hi-Z if the

selected power supply does not exceed the IN1/IN2 UVLO, or if neither

of the supplies exceeds the internal VDD UVLO.

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

D0

1

I

TTL- and CMOS-compatible input pins. Each pin has a 1-

µA pull-up. The truth table shown above illustrates the

functionality of D0 and D1.

D1

2

I

TTL- and CMOS-compatible input pins. Each pin has a 1-

µA pull-up. The truth table shown above illustrates the

functionality of D0 and D1.

GND

5

I

Ground

IN1

8

I

Primary power switch input. The IN1 switch can be enabled only if the IN1 supply is above the UVLO threshold and at

least one supply exceeds the internal VDD UVLO.

IN2

6

I

Secondary power switch input. The IN2 switch can be enabled only if the IN2 supply is above the UVLO threshold and

at least one supply exceeds the internal VDD UVLO.

ILIM

4

I

A resistor RILIM from ILIM to GND sets the current limit IL to 250/RILIM and 500/RILIM for the TPS2110A and TPS2111A,

respectively.

OUT

7

O

Power switch output

VSNS

3

I

In the auto-switching mode (D0 = 1, D1 = 0), an internal power FET connects OUT to IN1 if the VSNS voltage is greater

than 0.8 V. Otherwise, the FET connects OUT to the higher of IN1 and IN2. The truth table shown above illustrates the

functionality of VSNS.