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