LTC3447_15 Datasheet, PDF (3/16 Pages) Linear Technology – I2C Controllable Buck Regulator

LTC3447
ELECTRICAL CHARACTERISTICS ^{The ● denotes the specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.6V unless otherwise specified.
SYMBOL PARAMETER
CONDITION
MIN
TYP MAX
I²C Interface Timing
f_{I2C, MAX} Maximum I²C Operating Frequency
(Note 5)
400
t_BUF
Bus Free Time Between Stop and Start Condition (Note 5)
1.3
t_HD,RSTA Hold Time After (Repeated) Start Condition
(Note 5)
0.6
t_SU,RSTA Repeated Start Condition Setup Time
(Note 5)
0.6
t_SU,STOP Stop Condition Setup Time
(Note 5)
20
t_HD,DIN Data Hold Time, Input
(Note 5)
0
t_HD,DOUT Data Hold Time, Output
(Note 5)
280
410
670
t_SU,DAT Data Setup Time
(Note 5)
50
t_SP
Pulse Width of Spikes
(Note 5)
150
Suppressed by Input Filter
UNITS
kHz
µs
µs
µs
µs
ns
ns
ns
ns
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 specifications
from 0°C to 70°C. Specifications 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 specified 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.
WU
W
TI I G DIAGRA
SDA
SCL
t_{HD, STA}
START
COMMAND
t_LOW
t_{SU, DAT}
t_{HD, DAT}
t_{SU, STA}
t_{HD, STA}
t_HIGH
t_r
t_f
REPEATED
START
COMMAND
Figure 1. Timing Diagram
t_BUF
t_{SU, STO}
STOP
COMMAND
START
COMMAND
3447 F01
3447f
3