LTC3883 Datasheet, PDF (71/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
PMBus Command Details
VIN_ON
The VIN_ON command sets the input voltage, in volts, at which the unit should start power conversion.
This command has two data bytes and is formatted in Linear_5s_11s format.
VIN_OFF
The VIN_OFF command sets the input voltage, in volts, at which the unit should stop power conversion.
This command has two data bytes and is formatted in Linear_5s_11s format.
MFR_RVIN
The MFR_RVIN command is used to set the resistance value of the V_IN pin filter element in milliohms. (See also
READ_VIN). Set MFR_RVIN equal to 0 if no filter element is used.
This command has two data bytes and is formatted in Linear_5s_11s format.
Output Voltage and Limits
COMMAND NAME
VOUT_MODE
CMD CODE DESCRIPTION
0x20 Output voltage format and exponent (2^–12).
TYPE
R Byte
DATA
FORMAT
Reg
UNITS
VOUT_MAX
0x24 Upper limit on the output voltage the unit can R/W Word L16
V
command regardless of any other commands.
VOUT_OV_FAULT_ LIMIT
0x40 Output overvoltage fault limit.
R/W Word L16
V
VOUT_OV_WARN_ LIMIT
0x42 Output overvoltage warning limit.
R/W Word L16
V
VOUT_MARGIN_HIGH
0x25 Margin high output voltage set point. Must be R/W Word L16
V
greater than VOUT_COMMAND.
VOUT_COMMAND
0x21 Nominal output voltage set point.
R/W Word L16
V
VOUT_MARGIN_LOW
0x26 Margin low output voltage set point. Must be R/W Word L16
V
less than VOUT_COMMAND.
VOUT_UV_WARN_ LIMIT
0x43 Output undervoltage warning limit.
R/W Word L16
V
VOUT_UV_FAULT_ LIMIT
0x44 Output undervoltage fault limit.
R/W Word L16
V
POWER_GOOD_ON
POWER_GOOD_OFF
MFR_VOUT_MAX
0x5E Output voltage at or above which a power
R/W Word L16
V
good should be asserted.
0x5F Output voltage at or below which a power
R/W Word L16
V
good should be de-asserted.
0xA5 Maximum allowed output voltage.
R Word
L16
V
DEFAULT
NVM
VALUE
2^–12
0x14
Y
5.5
0x5800
Y
1.1
0x119A
Y
1.075
0x1133
Y
1.05
0x10CD
Y
1.0
0x1000
Y
0.95
0x0F33
Y
0.925
0x0ECD
Y
0.9
0x0E66
Y
0.93
0x0EE1
Y
0.92
0x0EB8
5.5
0x5800
VOUT_MODE
The data byte for VOUT_MODE command, used for commanding and reading output voltage, consists of a 3-bit mode
(only linear format is supported) and a 5-bit parameter representing the exponent used in output voltage Read/Write
commands.
This read-only command has one data byte.
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