Linear ANALOG DEVICES LTM4680, Operation Manual, Page: 10 / 126

LTM4680
10
Rev. B
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ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the specified internal
operating temperature range (Note 2). n is specified as each individual output channel (Note 4). T
A
= 25°C, V
IN
= 12V, RUN n = 3.3V,
EXTV
CC
= 0, FREQUENCY_SWITCH = 350kHz and V
OUT n
commanded to 1.000V unless otherwise noted. Configured with factory-default
EEPROM settings and per Test Circuit 1, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Digital Inputs SHARE_CLK, WP
V
IH
Input High Threshold Voltage
l
1.5 1.8 V
V
IL
Input Low Threshold Voltage
l
0.6 1 V
Digital Filtering of FAULT n
I
FLTG
Input Digital Filtering FAULT n 3 µs
Digital Filtering of PGOOD n
I
FLTG
Output Digital Filtering PGOOD n 100 µs
Digital Filtering of RUN n
I
FLTG
Input Digital Filtering RUN 10 µs
PMBus Interface Timing Characteristics
f
SCL
Serial Bus Operating Frequency
l
10 400 kHz
t
BUF
Bus Free Time Between Stop and
Start
l
1.3 µs
t
HD(STA)
Hold Time After Repeated Start
Condition After This Period, the First
Clock is Generated
l
0.6 µs
t
SU(STA)
Repeated Start Condition Setup Time
l
0.6 10000 µs
t
SU(ST0)
Stop Condition Setup Time
l
0.6 µs
t
HD(DAT)
Date Hold Time
Receiving Data
Transmitting Data
l
l
0
0.3 0.9
µs
µs
t
SU(DAT)
Data Setup Time
Receiving Data 0.1 µs
t
TIMEOUT_SMB
Stuck PMBus Timer Non-Block Reads
Stuck PMBus Timer Block Reads
Measured from the Last PMBus Start Event 32
255
ms
t
LOW
Serial Clock Low Period
l
1.3 10000 µs
t
HIGH
Serial Clock High Period
l
0.6 µs
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 LTM4680 is tested under pulsed-load conditions such that
T
J
≈ T
A
. The LTM4680E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the –40°C to 125°C internal operating temperature range are assured
by design, characterization and correlation with statistical process
controls. The LTM4680I is guaranteed to meet specifications over the full
–40°C to 125°C internal operating temperature range. T
J
is calculated from
the ambient temperature T
A
and the power dissipation PD according the
formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
Note that the maximum ambient temperature consistent with these
specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.