lt3755-2 Linear Technology Corporation, lt3755-2 Datasheet - Page 4

• Manufacturer Part Number: lt3755-2
• Description: Lt3755/lt3755-1/lt3755-2 40vin, 75vout Led Controllers Features
• Manufacturer: Linear Technology Corporation

elecTrical characTerisTics
LT3755/LT3755-1/LT3755-2
PARAMETER
Linear Regulator
INTV
Dropout (V
INTV
INTV
INTV
Logic Inputs/Outputs
PWM Input High Voltage
PWM Input Low Voltage
PWM Pin Resistance to GND
PWMOUT Output Low (V
PWMOUT Output High (V
SHDN/UVLO Threshold Voltage Falling
SHDN/UVLO Rising Hysteresis
SHDN/UVLO Input Low Voltage
SHDN/UVLO Pin Bias Current Low
SHDN/UVLO Pin Bias Current High
OPENLED Output Low (V
SYNC Pin Resistance to GND
SYNC Input High
SYNC Input Low
Gate Driver
t
t
GATE Output Low (V
GATE Output High (V
temperature range, otherwise specifications are at T
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 LT3755E, LT3755E-1 and LT3755E-2 are guaranteed to meet
performance specifications from 0°C to 125°C junction temperature.
Specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LT3755I, LT3755I-1 and LT3755I-2 are
guaranteed to meet performance specifications over the –40°C to 125°C
operating junction temperature range. The LT3755H-2 is guaranteed to
meet performance specifications over the full –40°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.

r
f
GATE Driver Output Rise Time
GATE Driver Output Fall Time
CC
CC
CC
CC
Regulation Voltage
Undervoltage Lockout
Current Limit
Current in Shutdown
IN
– INTV
CC
OL
OH
)
)
)
OL
OL
OH
)
)
)
A
= 25°C. V
CONDITIONS
I
SHDN/UVLO = 0V, INTV
E-, I-Grades
H-Grade
I
SHDN/UVLO = 1.15V
SHDN/UVLO = 1.30V
I
LT3755-1 Only
LT3755-1 Only
LT3755-1 Only
C
C
INTVCC
VIN
OPENLED
The
L
L
= 3300pF
= 3300pF
Drops Below 1µA
IN
l
= 24V, SHDN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
= –10mA, V
denotes the specifications which apply over the full operating
= 0.5mA (LT3755 and LT3755-2)
Note 3: For V
proper operation.
Note 4: GATE and PWMOUT pins are driven either to GND or INTV
internal switches. Do not connect these pins externally to a power supply.
Note 5: The LT3755 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operating above
the specified maximum operating junction temperature may impair device
reliability.
IN
= 7V
CC
= 7V
IN
below 6V, the SHDN/UVLO pin must not exceed V
l
l
l
l
INTV
INTV
1.185
1.175
0.05
0.05
MIN
3.9
1.5
1.5
1.7
29
45
7
CC
CC
–
–
1.220
7.15
2.05
TYP
350
4.1
34
60
20
10
30
35
35
8
0
1.245
1.245
MAX
0.05
100
200
7.3
4.3
0.4
0.4
2.5
0.4
40
12
50
IN
CC
for
37551fd
UNITS
by
mV
mA
mV
mV
mV
kΩ
kΩ
µA
µA
nA
ns
ns
V
V
V
V
V
V
V
V
V
V
V
V