www.ti.com
HW Description
3
SLVUAS6A – March 2017 – Revised January 2018
Submit Documentation Feedback
Copyright © 2017–2018, Texas Instruments Incorporated
LP2951EVM
2.2
Input Capacitors
Capacitors C
1
-C
3
are all capacitors routed to the input of the LP2951 device to ground. C
2
comes
populated on the board, and has a value of 1 µF. C
1
and C
3
are pads that allow for additional input
capacitors to be put on the board and can accommodate different capacitor sizes.
Figure 2. Input Capacitors C
1
-C
3
2.3
Output Capacitors
Capacitors C
4
-C
7
are all capacitors routed to the Output pin. C
4
-C
6
are ceramic caps routed in series with
a 1-
Ω
resistor, R
7
, from the output to ground. This series resistance helps stabilize the internal amplifier of
the LP2951 device. See the
LP2951
or
LP2951-N
data sheet for the recommended series resistance
when using a ceramic output capacitor. C
5
comes populated on the board and has a value of 2.2 µF. C
4
and C
6
are pads that allow for additional output capacitors to be put on the board and can accommodate
different capacitor sizes. C
7
is meant for an electrolytic capacitor. It is routed directly from the output to
ground with no series resistance, but still functionally the same as C
4
-C
6
. Electrolytic Capacitors do not
require an external series resistance as the internal ESR of an electrolytic is typically enough to keep the
device stable.
Figure 3. Output Capacitors C
4
-C
7
