Datasheet
TPS22930
SLVSBL3 –NOVEMBER 2012
www.ti.com
APPLICATION INFORMATION
ON/OFF CONTROL
The ON pins control the state of the switch. Asserting ON high enables the switch. ON is active high and has a
low threshold, making it capable of interfacing with low-voltage signals. The ON pin is compatible with standard
GPIO logic threshold. It can be used with any microcontroller with 1.2V or higher GPIO voltage. This pin cannot
be left floating and must be driven either high or low for proper functionality.
INPUT CAPACITOR (OPTIONAL)
To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns on into a
discharged load capacitor or short-circuit, it is recommended that a capacitor be placed between VIN and GND.
A 1-µF ceramic capacitor, C
IN
, placed close to the pins, is usually sufficient. Higher values of C
IN
can be used to
further reduce the voltage drop during high-current application. When switching heavy loads, it is recommended
to have an input capacitor about 100 times higher than the output capacitor to avoid excessive voltage drop;
however, a 100 to 1 ratio is not required for proper functionality of the device.
OUTPUT CAPACITOR (OPTIONAL)
Due to the integrated body diode in the PMOS switch, a C
IN
greater than C
L
is highly recommended. A C
L
greater than C
IN
can cause V
OUT
to exceed V
IN
when the system supply is removed. This could result in current
flow through the body diode from V
OUT
to V
IN
. A C
IN
to C
L
ratio of 100 to 1 is recommended for minimizing V
IN
dip
caused by inrush currents during startup; however, a 100 to 1 ratio is not required for proper functionality of the
device.
UNDER VOLTAGE LOCKOUT
Under voltage lockout protection turns off the switch if the input voltage drops below the under voltage lockout
threshold. With the ON pin active, the input voltage rising above the under voltage lockout threshold will allow a
controlled turn-on of the switch to limit current over-shoot.
REVERSE CURRENT PROTECTION
Reverse current protection (RCP) is only active when ON is asserted low. When ON is asserted high, current can
flow from VOUT to VIN or from VIN to VOUT. This allows the device to function as a bi-directional switch when
enabled.
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