Analog Devices Linear ADI Power SCP-LT3463-EVALZ Demo Manual page 4

DEMO MANUAL SCP-LT3463-EVALZ
Negative VIOC Equations
V − V = V = −1 .2 5 V
L DOIN L DOOUT VIOC
⎛
R
TOP
V = −1 .2 5
( )
⎝ ⎜
MAX L DOIN
R
Because the V term is simply the sum of the final
LDOIN
output voltage after the LDO and the difference the LT3463
is adding on top, it can be helpful to take the desired final
output voltage, add 1.0V, and then look up that voltage-
resistor combination from Table 2.
R can then be obtained by figuring out the difference
MAX
between the maximum and nominal output voltage of the
LT3463, divided by the current through the internal R
resistor, which is 1.25/R
BOT
4
⎛ ⎞
R
TOP
⎝ ⎜ ⎠ ⎟
R
BOT
⎞
+ R R
⎛ ⎞
MAX MAX
+ V
⎝ ⎜ ⎠ ⎟
⎠ ⎟
VIOC
4 0 k
BOT
.
BOT
Rev. 0