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LTM4700
PMBus COMMAND DETAILS
MFR_VOUT_MAX
The MFR_VOUT_MAX command is the maximum output voltage in volts for each channel, including VOUT_OV_FAULT_
LIMIT. If the output voltages are set to high range (Bit 6 of MFR_PWM_CONFIG set to a 0) MFR_VOUT_MAX is 3.6V. If
the output voltage is set to low range (Bit 6 of MFR_PWM_CONFIG set to a 1) the MFR_VOUT_MAX is 2.75V. Entering
a VOUT_COMMAND value greater than this will result in a CML fault and the output voltage setting will be clamped
to the maximum level. This will also result in Bit 3 VOUT_MAX_Warning in the STATUS_VOUT command being set.
This read only command has 2 data bytes and is formatted in Linear_16u format.
OUTPUT CURRENT AND LIMITS
COMMAND NAME
MFR_IOUT_CAL_GAIN
MFR_IOUT_CAL_GAIN_TC
IOUT_OC_FAULT_LIMIT
IOUT_OC_WARN_LIMIT
MFR_IOUT_CAL_GAIN
The IOUT_CAL_GAIN command is used to set the resistance value of the current sense resistor in milliohms. (see
also MFR_IOUT_CAL_GAIN_TC).
This command has two data bytes and is formatted in Linear_5s_11s format. Consult the factory for details.
MFR_IOUT_CAL_GAIN_TC
The MFR_IOUT_CAL_GAIN_TC command allows the user to program the temperature coefficient of the IOUT_CAL_GAIN
sense resistor or inductor DCR in ppm/°C.
This command has two data bytes and is formatted in 16-bit 2's complement integer ppm. N = –32768 to 32767 •
–6
10
. Nominal temperature is 27°C. The IOUT_CAL_GAIN is multiplied by:
[1.0 + MFR_IOUT_CAL_GAIN_TC • (READ_TEMPERATURE_1-27)].
DCR sensing will have a typical value of 3900.
The IOUT_CAL_GAIN and MFR_IOUT_CAL_GAIN_TC impact all current parameters including: READ_IOUT,
MFR_IOUT_PEAK, IOUT_OC_FAULT_LIMIT and IOUT_OC_WARN_LIMIT.
88
CMD CODE DESCRIPTION
The ratio of the voltage at the current
sense pins to the sensed current. For
devices using a fixed current sense
resistor, it is the resistance value in
mΩ.
0xF6
Temperature coefficient of the current
sensing element.
0x46
Output overcurrent fault limit.
0x4A
Output overcurrent warning limit.
For more information
DATA
TYPE
PAGED
FORMAT
R/W Word
Y
L11
R/W Word
Y
CF
R/W Word
Y
L11
R/W Word
Y
L11
www.analog.com
DEFAULT
UNITS
NVM
VALUE
mΩ
Y
Set at
Factory
ppm/°C
Y
3800
0xOED8
A
Y
65
0xEA08
A
Y
55
0xE370
Rev. B
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