Datasheet

LTC3447
3
3447f
SYMBOL PARAMETER CONDITION MIN TYP MAX UNITS
I
2
C Interface Timing
f
I2C, MAX
Maximum I
2
C Operating Frequency (Note 5) 400 kHz
t
BUF
Bus Free Time Between Stop and Start Condition (Note 5) 1.3 µs
t
HD,RSTA
Hold Time After (Repeated) Start Condition (Note 5) 0.6 µs
t
SU,RSTA
Repeated Start Condition Setup Time (Note 5) 0.6 µs
t
SU,STOP
Stop Condition Setup Time (Note 5) 20 µs
t
HD,DIN
Data Hold Time, Input (Note 5) 0 ns
t
HD,DOUT
Data Hold Time, Output (Note 5) 280 410 670 ns
t
SU,DAT
Data Setup Time (Note 5) 50 ns
t
SP
Pulse Width of Spikes (Note 5) 150 ns
Suppressed by Input Filter
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V unless otherwise specifi ed.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3447E is guaranteed to meet performance specifi cations
from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
temperature are assured by design, characterization and correlation with
statistical process controls.
Note 3: T
J
is calculated from the ambient temperature, T
A
, and the power
dissipation, P
D
, according to the following formula:
T
J
= T
A
+ P
D
• 43°C/W
This IC includes overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperature
will exceed 125°C when overtemperature protection is active. Continuous
operation above the specifi ed maximum operating junction temperature
may impair device reliability.
Note 4: Dynamic supply current is higher due to gate charge being
delivered at the switching frequency.
Note 5: Determined by design, not production tested.
Note 6: The LTC3447 is tested in a proprietary test mode that connects
V
OUT
to FB.
TI I G DIAGRA
UWW
t
LOW
t
r
t
f
t
HD, STA
t
HIGH
t
SU, DAT
t
SU, STA
t
HD, DAT
t
HD, STA
t
SU, STO
t
BUF
START
COMMAND
REPEATED
START
COMMAND
STOP
COMMAND
START
COMMAND
SDA
SCL
3447 F01
Figure 1. Timing Diagram