Datasheet

W-=-= 400
01.0
min_
max_
min
A
V
R
I
V
R
OUT
IPG
PG
OUT
Pullup
V
TH_PG
FB
PG Comparator
R
IPG
R
Pullup
V
max 10V
PG
V
OUT
PG
TPS62125
C
OUT
Power Good
A
VV
R
OUT
Pullup
0004.0
3.0
min
-
=
VIN
V
IN_startup
V
IN_stop
VOUT
Hysteresis
DC/DC start
DC/DC stop
Proper V ramp up
OUT
TPS62125
www.ti.com SLVSAQ5C –MARCH 2012–REVISED DECEMBER 2013
Figure 54. Using the EN comparator as input SVS for proper V
OUT
ramp up
POWER GOOD (PG) PULL UP / OUTPUT DISCHARGE RESISTOR
The Power Good open collector output needs an external pull up resistor to indicate a high level. The pull up
resistor can be connected to a voltage level up to 10V. The output can sink current up to 0.4mA with specified
output low level of less than 0.3V. The lowest value for the pull up resistor can be calculated by:
(11)
Figure 55. PG open collector output
The PG pin can be used to discharge the output capacitor. The PG output has an internal resistance R
IPG
of
typical 600Ω and minimum 400Ω. The maximum sink current into the PG pin is 10mA. In order to limit the
discharge current to the maximum allowable sink current into the PG pin, the external pull up resistor R
Pull up
can
be calculated to:
(12)
In case a negative value is calculated, the external pull up resistor can be removed and the PG pin can be
directly connected to the output.
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