Datasheet

( )
( )
AD _IN max
IMON
LOAD max
63k V
R
I
W ´
=
OUT IN OUT
V V 0.04 I= - ´
TPS2420
SLUS903F –JANUARY 2009–REVISED JANUARY 2014 www.ti.com
VIN: Input voltage to the TPS2420 device. The recommended operating voltage range is 3 V to 18 V. All VIN
pins should be connected together and to the power source.
VOUT: Output connection for the TPS2420 device. When switched on the output voltage will be approximately:
(5)
All V
OUT
pins must be connected together and to the load.
LTCH: When pulled low the TPS2420 device attempts to restart after a fault. If left floating or pulled high the
TPS2420 device latches off after a fault. This pin is internally clamped at 3 V and is pulled to the internal 3-V
supply by diode in series with a 100-kΩ resistor.
PG: Active low, Open Drain output, Power Good indicates that there is no fault condition and the output voltage
is within 0.5 V of the input voltage. PG becomes operational before UV, whenever V
IN
is greater than 1 V.
IMON: This is a scaled analog output of I
VIN
. Select R
IMON
based on the maximum allowed A/D input voltage
(V
AD_FS
) and the desired full-scale current in VIN (I
VIN_FS
) per the following equation
(6)
This pin is clamped at 2.5 V to protect A/D converters. It is recommended that I
MON
be ignored until after PG
asserts because the I
MON
output is accurate only after V
OUT
> 3 V.
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