LT3956 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3956 Datasheet PDF : 20 Pages
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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 TA = 25°C. VIN = 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP MAX UNITS
Logic Inputs/Outputs
PWM Threshold Voltage
l
0.85
1.35 1.8
V
PWM Pin Resistance to GND
45
60
kΩ
EN/UVLO Threshold Voltage Falling
l 1.185 1.220 1.245
V
EN/UVLO Rising Hysteresis
20
mV
EN/UVLO Input Low Voltage
EN/UVLO Pin Bias Current Low
IVIN Drops Below 1µA
EN/UVLO = 1.15V
0.4
V
1.7
2.1
2.5
µA
EN/UVLO Pin Bias Current High
EN/UVLO = 1.30V
10
100
nA
VMODE Output Low (VOL)
VMODE Pin Leakage
IVMODE = 1mA
FB = 0V, VMODE = 12V
200
mV
0.1
5
µA
PWMOUT Driver
tr PWMOUT Driver Output Rise Time
tf PWMOUT Driver Output Fall Time
PWMOUT Output Low (VOL)
PWMOUT Output High (VOH)
CL = 560pF
CL = 560pF
35
ns
35
ns
0.05
V
INTVCC –
V
0.05
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 VIN below 6V, the EN/UVLO pin must not exceed VIN for proper
operation.
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
V(ISP–ISN) Threshold vs VCTRL
300
250
200
150
100
50
0
–50
0
0.5
1
1.5
CTRL VOLTAGE (V)
2
3956 G01
V(ISP–ISN) Threshold vs VISP
with Reduced CTRL Voltage
103
CTRL = 0.5V
102
101
100
99
98
97
0
20
40
60
ISP VOLTAGE (V)
80
3956 G02
V(ISP–ISN) Full-Scale Threshold
vs Temperature
256
CTRL = 2V
254
252
250
248
246
244
242
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3956 G03
3956f
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