TPS22985 Datasheet, PDF (1/20 Pages) Texas Instruments – Thunderbolt™ SUPPLY SELECTION IC

TPS22985
www.ti.com
SLVSBA9B – MARCH 2012 – REVISED JUNE 2012
Thunderbolt™ SUPPLY SELECTION IC
Check for Samples: TPS22985
FEATURES
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•2 2.8 V to 19.8 V
• Auto Selects 3.3 V Supply
• > 10-mA Low Power Switch
• > 500-mA 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
VDD1
VDD2
CPO
Charge
Pump
FET 1
FET 3
FET 4
FET 2
Logic
Core
RESETZ
ENB
CFG/OE
RX
RXH
TX
TXH
Level
Shifter
Level
Shifter
RXC
TXC
DESCRIPTION
The TPS22985 is a supply selection device for active
Thunderbolt™ cables. The device selects a supply
that is at 3.3V from two supply inputs and connects
this to two non-current limited outputs OUTA and
OUTB. When 3.3V is not present at either supply, the
outputs become high impedance.
The TPS22985 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 VDD
when the ENB input is high.
In Control Mode, OUTA functions 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
TPS22985 opens all switches and the outputs OUTA
and OUTB become high impedance. When the
connected VDD exceeds a maximum voltage of 3.6V,
it is disconnected from the outputs. VDD2 will only
connect when it is in the valid range and VDD1 is
greater than 3.6V
The TPS22985 is available in a 1.6mm x 1.6mm
WCSP package.
CFG2 (Thunderbolt^TM)
Cable uC and CDR Retimier
Figure 1. Typical Application
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Thunderbolt is a trademark of Intel Corporation.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated