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LT3956
elecTrical characTerisTics
erature range, otherwise specifications are at T
PARAMETER
Logic Inputs/Outputs
PWM Threshold Voltage
PWM Pin Resistance to GND
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
VMODE Output Low (V
)
OL
VMODE Pin Leakage
PWMOUT Driver
t
PWMOUT Driver Output Rise Time
r
t
PWMOUT Driver Output Fall Time
f
PWMOUT Output Low (V
)
OL
PWMOUT Output High (V
)
OH
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 LT3956E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
Typical perForMance characTerisTics
V
Threshold vs V
(ISP–ISN)
300
250
200
150
100
50
0
–50
0
0.5
1
CTRL VOLTAGE (V)
The
= 25°C. V
A
IN
CONDITIONS
I
Drops Below 1µA
VIN
EN/UVLO = 1.15V
EN/UVLO = 1.30V
I
= 1mA
VMODE
FB = 0V, VMODE = 12V
C
= 560pF
L
C
= 560pF
L
V
(ISP–ISN)
with Reduced CTRL Voltage
CTRL
103
CTRL = 0.5V
102
101
100
99
98
97
1.5
2
0
20
3956 G01
denotes the specifications which apply over the full operating temp-
l
= 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3956I is guaranteed to meet performance specifications over the –40°C
to 125°C operating junction temperature range.
Note 3: For V
below 6V, the EN/UVLO pin must not exceed V
IN
operation.
T
= 25°C, unless otherwise noted.
A
Threshold vs V
ISP
40
60
80
ISP VOLTAGE (V)
3956 G02
MIN
TYP
MAX
0.85
1.35
1.8
l
45
60
1.185
1.220
1.245
l
20
0.4
1.7
2.1
2.5
10
100
200
0.1
5
35
35
0.05
INTV
–
CC
0.05
V
Full-Scale Threshold
(ISP–ISN)
vs Temperature
256
CTRL = 2V
254
252
250
248
246
244
242
25
50
–50
–25
0
TEMPERATURE (°C)
UNITS
V
kΩ
V
mV
V
µA
nA
mV
µA
ns
ns
V
V
for proper
IN
125
75
100
3956 G03
3956f
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