LT3965/LT3965-1
4
39651fa
For more information www.linear.com/LT3965
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 40V, V
DD
= EN/UVLO = 5V, LEDREF = 3V, SRC = 0V, ADDR[4:1] not
connected, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
RTCLK Output Voltage (Using Internal
Oscillator)
R
TCLK
= 28kΩ 0.83 0.88 0.93 V
RTCLK Input Low Threshold (RT
VIL
)
l
0.4 V
RTCLK Input High Threshold (RT
VIH
)
l
1.5 V
RTCLK Input Clock Frequency 2.5 MHz
RTCLK Input Clock Pulse Width High (T
RTH
) 100 ns
RTCLK Input Clock Pulse Width Low (T
RTL
) 100 ns
RTCLK Input Clock Ramp Time between RT
VIL
and RT
VIH
(T
RTRAMP
)
T
RTL
= 10µs 2.3 µs
Address Select
ADDR[4:1] Input Low
l
0.25V
DD
V
ADDR[4:1] Input High
l
0.75V
DD
V
ADDR[4:1] Pull-Up Resistance to V
DD
300 500 700 kΩ
Alert Status Output
ALERT Output Low Voltage I
ALERT
= 3mA 0.3 0.4 V
ALERT Output High Leakage Current ALERT = 5.5V 0.1 µA
External LED Reference Voltage for Shorted LED Detection
LEDREF Input Linear Range 0 4 V
LEDREF Input Bias Current 0V ≤ LEDREF ≤ 4V –100 100 nA
I
2
C Port (See Note 5 for I
2
C Timing Diagram)
SDA and SCL Input Threshold Rising
l
0.7V
DD
V
SDA and SCL Input Threshold Falling
l
0.25V
DD
V
SDA and SCL Input Hysteresis
l
0.05V
DD
V
SDA and SCL Input Current SDA = SCL = 0V to 5.5V –250 250 nA
SDA Output Low Voltage I
SDA
= 3mA
l
0.4 V
SCL Clock Operating Frequency
l
400 kHz
(Repeated) Start Condition Hold Time (t
HD_STA
)
l
0.6 μs
Repeated Start Condition Set-Up Time (t
SU_STA
)
l
0.6 µs
Stop Condition Setup Time (t
SU_STO
)
l
0.6 μs
Data Hold Time Output (t
HD_DAT(O)
)
l
0 900 ns
Data Hold Time Input (t
HD_DAT(I)
)
l
0 ns
Data Set-Up Time (t
SU_DAT
)
l
100 ns
SCL Clock Low Period (t
LOW
)
l
1.3 µs
SCL Clock High Period (t
HIGH
)
l
0.6 μs
Data Rise Time (t
r
) C
B
= Capacitance of One BUS Line (pF) (Note 4) 20 + 0.1C
B
300 ns
Data Fall Time (t
f
) C
B
= Capacitance of One BUS Line (pF) (Note 4) 20 + 0.1C
B
300 ns
Input Spike Suppression Pulse Width (t
SP
) 50 ns
Bus Free Time (t
BUF
)
l
1.3 µs
