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LTM4681
ELECTRICAL CHARACTERISTICS
operating temperature range (Note 2). Specified as each individual output channel (Note 4). T
RUNP = 0, FREQUENCY_SWITCH = 350kHz and V
EEPROM settings and per Test Circuit 1, unless otherwise noted.
SYMBOL
PARAMETER
Digital Input WP_nn
I
Input Pull-Up Current
PUWP
Open-Drain Outputs SCL_nn, SDA_nn, FAULT_nn, ALERT_nn, RUNn, SHARE_CLK_nn, PGOODn
V
Output Low Voltage
OL
Digital Inputs SHARE_CLK_nn, WP_nn
V
Input High Threshold Voltage
IH
V
Input Low Threshold Voltage
IL
Digital Filtering of FAULTn
I
Input Digital Filtering FAULTn
FLTG
Digital Filtering of PGOODn
I
Output Digital Filtering PGOODn
FLTG
Digital Filtering of RUNn
I
Input Digital Filtering RUN
FLTG
PMBus Interface Timing Characteristics
f
Serial Bus Operating Frequency
SCL
t
Bus Free Time Between Stop and
BUF
Start
t
Hold Time After Repeated Start
HD(STA)
Condition After This Period, the First
Clock is Generated
t
Repeated Start Condition Setup Time
SU(STA)
t
Stop Condition Setup Time
SU(ST0)
t
Date Hold Time
HD(DAT)
Receiving Data
Transmitting Data
t
Data Setup Time
SU(DAT)
Receiving Data
t
Stuck PMBus Timer Non-Block Reads
TIMEOUT_SMB
Stuck PMBus Timer Block Reads
t
Serial Clock Low Period
LOW
t
Serial Clock High Period
HIGH
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTM4681 is tested under pulsed-load conditions such that
T
≈ T
. The LTM4681E is guaranteed to meet performance specifications
J
A
over the 0°C to 125°C internal operating temperature range. Specifications
10
The
denotes the specifications which apply over the specified internal
l
commanded to 1.000V unless otherwise noted. Configured with factory-default
OUTn
CONDITIONS
WP
I
= 3mA
SINK
Measured from the Last PMBus Start Event
over the –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM4681I is guaranteed to meet specifications over the full
–40°C to 125°C internal operating temperature range. T
the ambient temperature T
formula:
For more information
www.analog.com
= 25°C, V
= 12V, RUNn = 3.3V,
A
IN
MIN
l
0.6
l
l
1.3
l
0.6
l
0.6
l
0.6
l
l
0.3
l
0.1
1.3
l
0.6
l
and the power dissipation PD according the
A
T
= T
+ (P
• θ
)
J
A
D
JA
TYP
MAX
UNITS
10
µA
0.4
V
1.5
1.8
V
1
V
3
µs
100
µs
10
µs
10
400
kHz
µs
µs
10000
µs
µs
0
0.9
µs
µs
µs
32
ms
255
10000
µs
µs
is calculated from
J
Rev. A
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