Datasheet

LTC3675/LTC3675-1
7
36751fc
For more information www.linear.com/LTC3675
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
BUF
Bus Free Time Between Stop and Start
Condition
1.3 µs
t
HD_SDA
Hold Time After Repeated Start Condition 0.6 µs
t
SU_STA
Repeated Start Condition Set-Up Time 0.6 µs
t
SU_STO
Stop Condition Set-Up Time 0.6 µs
t
HD_DAT(O)
Data Hold Time Output 0 900 ns
t
HD_DAT(I)
Data Hold Time Input 0 ns
t
SU_DAT
Data Set-Up Time 100 ns
t
LOW
SCL Clock Low Period 1.3 µs
t
HIGH
SCL Clock High Period 0.6 µs
t
f
Clock/Data Fall Time C
B
= Capacitance of One Bus Line (pF) 20+0.1C
B
300 ns
t
r
Clock/Data Rise Time C
B
= Capacitance of One Bus Line (pF) 20+0.1C
B
300 ns
t
SP
Input Spike Suppression Pulse Width 50 ns
Interface Logic Pins (PBSTAT, WAKE, RSTB, IRQB, ONB)
I
LK(HIGH)
Output High Leakage Current 3.6V at Pin –1 1 µA
V
OL
Output Low Voltage 3mA into Pin 100 400 mV
V
ONB(HIGH)
ONB High Threshold 800 1200 mV
V
ONB(LOW)
ONB Low Threshold 400 700 mV
Interface Logic Pins (EN1, EN2, EN3, EN4, ENBB)
V
HI_ALLOFF
Enable Rising Threshold All Regulators and LED Driver Disabled
l
400 650 1200 mV
V
EN_HYS
Enable Falling Hysteresis 60 mV
V
HI
Enable Rising Threshold At Least One Regulator/LED Driver Enabled
l
380 400 420 mV
I
EN
Enable Pin Leakage Current EN = 3.6V –1 1 µA
Pushbutton Parameters; CT = 0.01µF
t
ONB_LO
ONB Low Time to PBSTAT Low WAKE High 28 50 72 ms
t
ONB_WAKE
ONB Low Time to WAKE High 280 400 520 ms
t
ONB_HR
ONB Low to Hard Reset 3.5 5 6.5 sec
t
HR
Time for Which All Enabled Regulators are
Disabled
0.7 1 1.3 sec
t
PBSTAT_PW
PBSTAT Minimum Pulse Width 28 50 72 ms
t
WAKE_ON
WAKE High Time 3.5 5 6.5 sec
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 LTC3675/LTC3675-1 are tested under pulsed load conditions
such that T
A
≈ T
J
. The LTC3675/LTC3675-1 are guaranteed to meet
performance specifications from 0°C to 125°C. Specifications over the
–40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
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 impedance and other
environmental factors.
Note 3: The LTC3675/LTC3675-1 include overtemperature protection
which protects 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:
Static current, switches not switching. Actual current may be
higher due to gate charge losses at the switching frequency.
Note 5: Currents measured at a specific V
IN
pin. Buck 1 (V
IN
, Pin 6);
Buck 2 (V
IN
, Pin 7); Buck 3 and Buck 4 (V
IN
, Pin 10); Boost and Buck
Boost (V
IN
, Pin 34); LED driver (V
IN
, Pin 31).
Note 6: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current rating may result in device
degradation over time.
Note 7: With dual string operation, the LED pin with the lower voltage sets
the regulation point.