LT3795
elecTrical characTerisTics
PARAMETER
Linear Regulator
INTV
CC
Regulation Voltage
Dropout (V
IN
-INTV
CC
)
INTV
CC
Current Limit
INTV
CC
Shutdown Bias Current if Externally
Driven to 7V
INTV
CC
Undervoltage Lockout
INTV
CC
Undervoltage Lockout Hysteresis
Oscillator
Switching Frequency
R
T
= 82.5k
R
T
= 19.6k
R
T
= 6.65k
(Note 5)
(Note 5)
V
RAMP
= 2V
l
l
l
l
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C, V
IN
= 24V, EN/UVLO = 24V, CTRL1 = CTRL2 = 2V, PWM = 5V, unless otherwise noted.
CONDITIONS
MIN
7.4
18
85
13
3.8
4
200
85
340
900
105
400
1000
160
210
70
1
2
RAMP = 0.4V
RAMP = 1.6V
l
TYP
7.7
550
MAX
8
UNITS
V
mV
mA
mA
I
INTVCC
= –10mA, V
IN
= 4.5V
V
IN
= 110V, INTV
CC
= 6V
V
IN
= 12V, INTV
CC
= 6V
EN/UVLO = 0V, INTV
CC
= 7V
17
4.1
µA
V
mV
125
480
1150
kHz
kHz
kHz
ns
ns
%
V
V
µA
µA
Minimum Off-Time
Minimum On-Time
Switching Frequency Modulation
RAMP Input Low Threshold
RAMP Input High Threshold
RAMP Pin Source Current
RAMP Pin Sink Current
LOGIC Input/Outputs
PWM Input Threshold Rising
PWM Pin Bias Current
EN/UVLO Threshold Voltage Falling
EN/UVLO Rising Hysteresis
EN/UVLO Input Low Voltage
EN/UVLO Pin Bias Current Low
EN/UVLO Pin Bias Current High
OPENLED
OUTPUT Low
SHORTLED
OUTPUT Low
OVLO Threshold Voltage Rising
OVLO Falling Hysteresis
OVLO Pin Input Current
Gate Driver
t
r
NMOS GATE Driver Output Rise Time
t
f
NMOS GATE Driver Output Fall Time
NMOS GATE Output Low (V
OL
)
NMOS GATE Output High (V
OH
)
t
r
Top GATE Driver Output Rise Time
t
f
Top GATE Driver Output Fall Time
Top Gate On Voltage (V
ISP
-V
TG
)
Top Gate Off Voltage (V
ISP
-V
TG
)
12
12
0.96
1.185
0.4
2.5
3
10
3.8
100
300
300
l
1
10
1.220
20
1.04
1.25
V
µA
V
mV
V
µA
nA
mV
mV
V
mV
nA
ns
ns
l
I
VIN
Drops Below 1µA
EN/UVLO = 1.15V
EN/UVLO = 1.30V
I
OPENLED
= 0.5mA
I
SHORTLED
= 0.5mA
1.215
1.25
28
150
1.28
C
L
= 3300pF 10% to 90%
,
C
L
= 3300pF 10% to 90%
,
INTV
CC
–
0.05
C
L
= 300pF
C
L
= 300pF
ISP = 48V
PWM = 0V, ISP = 48V
20
18
0.05
V
V
50
100
7
0
8
0.3
ns
ns
V
V
3795f
4
For more information
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
