Analog Devices Linear LTM 4700 User Manual page 31

OPERATION
Table 3. FSWPH_CFG Pin Strapping Look-Up Table to Set the LTM4700's Switching Frequency and Channel Phase-Interleaving Angle
(Not Applicable if MFR_CONFIG_ALL[6] = 1b)
R * SWITCHING
FSWPH_CFG
(kΩ) FREQUENCY (kHz)
NVM; LTM4700
Open Default = 350
32.4
22.6
18.0
15.4
12.7
10.7
7.68
6.34
5.23
4.22
3.24
2.43
1.65
0.787
0
*R value indicated is nominal. Select R
FSWPH_CFG
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
over time. All such effects must be taken into account in order for resistor pin-strapping to yield the expected result at every SV
execution of MFR_RESET or RESTORE_USER_ALL, over the lifetime of one's product.
**External setting corresponds to FREQUENCY_SWITCH (Register 0x33) value set to 0x0000; the device synchronizes its switching frequency to that of
the clock provided on the SYNC pin, provided MFR_CONFIG_ALL[4] = 1b.
θSYNC TO θ0
NVM; LTM4700
Default = 0°
250 0°
350 0°
425 0°
575 0°
650 0°
750 0°
500 120°
500 90°
External** 0°
External** 0°
External** 60°
External** 120°
External** 90°
External** 0°
External** 120°
from a resistor vendor such that its value is always within 3% of the value indicated in the
FSWPH_CFG
For more information
bits [2:0] of MFR_
θSYNC TO θ1 PWM_CONFIG
NVM; LTM4700 NVM; LTM4700
Default = 180° Default = 000b
180°
180°
180°
180°
180°
180°
240°
270°
240°
120°
240°
300°
270°
180°
240°
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LTM4700
bit [4] of MFR_
CONFIG_ALL
NVM; LTM4700
Default = 0b
000b 0b
000b 0b
000b 0b
000b 0b
000b 0b
000b 0b
100b 0b
001b 0b
010b 1b
011b 1b
101b 1b
110b 1b
001b 1b
000b 1b
100b 1b
's value
FSWPH_CFG
power-up and/or every
IN
31
Rev. B