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LTC4449 Datasheet(PDF) 38 Page - Linear Technology

Part # LTC4449
Description  Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management
PDF  108 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4449 Datasheet(HTML) 38 Page - Linear Technology

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LTC3882-1
38
Rev A
For more information www.analog.com
PMBus COMMAND SUMMARY
Table 7. PMBus Command Summary
COMMAND NAME
CMD
CODE DESCRIPTION
TYPE
PAGED
DATA
FORMAT UNITS NVM
DEFAULT
VALUE
SEE
PAGE
PAGE
0x00 Channel (page) presently selected for
any paged command.
R/W Byte
N
Reg
0x00
69
OPERATION
0x01 On, off and margin control.
R/W Byte
Y
Reg
l
0x80
73
ON_OFF_CONFIG
0x02 RUN pin and PMBus on/off command
configuration.
R/W Byte
Y
Reg
l
0x1E
72
CLEAR_FAULTS
0x03 Clear all set fault bits.
Send Byte
N
90
PAGE_PLUS_WRITE
0x05 Write a command directly to a specified
page.
W Block
N
69
PAGE_PLUS_READ
0x06 Read a command directly from a
specified page.
Block R/W
Process
N
70
WRITE_PROTECT
0x10 Protect the device against unintended
PMBus modifications.
R/W Byte
N
Reg
l
0x00
70
STORE_USER_ALL
0x15 Store entire operating memory in
EEPROM.
Send Byte
N
102
RESTORE_USER_ALL
0x16 Restore entire operating memory from
EEPROM.
Send Byte
N
102
CAPABILITY
0x19 Summary of supported optional PMBus
features.
R Byte
N
Reg
0xB0
71
SMBALERT_MASK
0x1B Mask ALERT activity
Block R/W
Y
Reg
l
see CMD
details
98
VOUT_MODE
0x20 Voltage-related format (Linear) and
exponent.
R Byte
Y
Reg
0x14
2–12
79
VOUT_COMMAND
0x21 Nominal VOUT value.
R/W Word
Y
L16
V
l
1.0V
0x1000
79
VOUT_MAX
0x24 Maximum VOUT that can be set by any
command, including margin.
R/W Word
Y
L16
V
l
5.5V
0x5800
80
VOUT_MARGIN_HIGH
0x25 VOUT at high margin, must be greater
than VOUT_COMMAND.
R/W Word
Y
L16
V
l
1.05V
0x10CD
80
VOUT_MARGIN_LOW
0x26 VOUT at low margin, must be less than
VOUT_COMMAND.
R/W Word
Y
L16
V
l
0.95V
0x0F33
80
VOUT_TRANSITION_RATE
0x27 VOUT slew rate for programmed output
changes.
R/W Word
Y
L11
V/ms
l
0.25
0xAA00
84
FREQUENCY_SWITCH
0x33 PWM frequency control.
R/W Word
N
L11
kHz
l
500kHz
0xFBE8
74
VIN_ON
0x35 Minimum input voltage to begin power
conversion.
R/W Word
N
L11
V
l
6.5V
0xCB40
78
VIN_OFF
0x36 Decreasing input voltage at which power
conversion stops.
R/W Word
N
L11
V
l
6.0V
0xCB00
78
IOUT_CAL_GAIN
0x38 Ratio of ISENSE± voltage to sensed
current.
R/W Word
Y
L11
mΩ
l
0.63mΩ
0xB285
82
VOUT_OV_FAULT_LIMIT
0x40 VOUT overvoltage fault limit.
R/W Word
Y
L16
V
l
1.1V
0x119A
80
VOUT_OV_FAULT_RESPONSE
0x41 VOUT overvoltage fault response.
R/W Byte
Y
Reg
l
0xB8
95
VOUT_OV_WARN_LIMIT
0x42 VOUT overvoltage warning limit.
R/W Word
Y
L16
V
l
1.075V
0x1133
81



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