Analog Devices Linear LTM 4700 User Manual page 30

LTM4700
OPERATION
Table 1. VOUTn _CFG Pin Strapping Look-Up Table for the
LTM4700's Output Voltage, Coarse Setting (Not Applicable if
MFR_CONFIG_ALL[6] = 1b)
R * V
VOUTn_CFG
(kΩ) SETTING COARSE
Open
32.4
22.6
18.0
15.4
12.7
10.7
9.09
7.68
6.34
5.23
4.22
3.24
2.43
1.65
0.787
0
*R value indicated is nominal. Select R
VOUTn_CFG
resistor vendor such that its value is always within 3% of the value
indicated in the table. Take into account resistor initial tolerance, T.C.R.
and resistor operating temperatures, soldering heat/IR reflow, and
endurance of the resistor over its lifetime. Thermal shock/cycling,
moisture (humidity) and other effects (depending on one's specific
application) could also affect R
VOUTn_CFG
effects must be taken into account in order for resistor pin strapping to
yield the expected result at every SV
of MFR_RESET or RESTORE_ USER_ALL, over the lifetime of one's
product.
30
(V) MFR_PWM_
OUTn
MODEn[1] BIT
NVM NVM
NVM NVM
3.3 0
3.1 0
2.9 0
2.7 0
2.5 0, if V > 0mV
TRIMn
1, if V ≤ 0mV
TRIMn
2.3 1
2.1 1
1.9 1
1.7 1
1.5 1
1.3 1
1.1 1
0.9 1
0.7 1
0.5 1
from a
VOUTn_CFG
's value over time. All such
power-up and/or every execution
IN
For more information
Table 2. VTRIMn_CFG Pin Strapping Look-Up Table for the
LTM4700's Output Voltage, Fine Adjustment Setting (Not
Applicable if MFR_CONFIG_ALL[6] = 1b)
R * V
VTRIMn_CFG TRIM
(kΩ)
Open
32.4
22.6
18.0
15.4
12.7
10.7
9.09
7.68
6.34
5.23
4.22
3.24
2.43
1.65
0.787
0
*R value indicated is nominal. Select R
VTRIMn_CFG
resistor vendor such that its value is always within 3% of the value
indicated in the table. Take into account resistor initial tolerance, T.C.R.
and resistor operating temperatures, soldering heat/IR reflow, and
endurance of the resistor over its lifetime. Thermal shock/cycling,
moisture (humidity) and other effects (depending on one's specific
application) could also affect R
VTRIMn_CFG
effects must be taken into account in order for resistor pin strapping to
yield the expected result at every SV
of MFR_RESET, or RESTORE_USER_ALL over the lifetime of one's
product.
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(mV) FINE ADJUSTMENT TO V
OUTn
SETTING WHEN RESPECTIVE
0
99
86.625
74.25
61.875
49.5
37.125
24.75
12.375
–12.375
–24.75
–37.125
–49.5
–61.875
–74.25
–86.625
–99
from a
VTRIMn_CFG
's value over time. All such
power-up and/or every execution
IN
Rev. B