FEATURES

2• 2.8 V to 19.8 V Input

• Auto Selects 3.3 V supply

• >10mA Low Power Switch

• >500mA High Power Switch

• Reverse Current Blocking from OUT to VDD

• Wake on UART Input Activity

• UART RX and TX Buffers

APPLICATIONS

• Thunderbolt™ Cables

• Notebook Computers

• Desktop Computers

• Power Management Systems

DESCRIPTION

The TPS22986 is a supply selection device for active

Thunderbolt™ cables. The device selects a 3.3V

input from two available supplies and connects the

chosen input to two outputs, OUTA and OUTB. When a 3.3V supply is not present, the outputs become

high impedance.

The TPS22986 has two modes of operation, Normal

and Control. In Normal Mode, OUTA is always on

when a valid supply is present. OUTB is connected to

a valid supply when the ENB input is high.

In Control Mode, OUTA behaves the same as Normal

Mode and OUTB is controlled by a combination of

monitored inputs and valid supplies on VDD1 and VDD2. When a valid VDD is available, the device

waits for a rising input on ENB and then disconnects

OUTB until the next falling RXH transition. Once the

next falling RXH transition occurs, the device

reconnects OUTB.

In either mode, when a valid VDD is not available, the

TPS22986 opens all switches and the outputs OUTA

and OUTB become high impedance. When the

connected VDD exceeds 3.6V, it is disconnected from

the outputs.

The TPS22986 is available in a 1.6mm x 1.6mm

WCSP package.