LT1942 Ver la hoja de datos (PDF) - Linear Technology
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LT1942 Datasheet PDF : 16 Pages
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LT1942
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, VSHDN = VIN, unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
PGOOD Leakage Current
PGOOD Sink Current
CT Charging Current
PGOOD NPN Off, VPGOOD = 5V
PGOOD NPN On, VPGOOD = 1V
0
0.1
µA
0.5
0.7
mA
12
µA
CT Reference Voltage
0.8
V
VOUT3 Leakage Current
VOUT3 Source Current
Minimum D3/VOUT3 Operating Voltage
Output Disconnect PNP Off, D3 = 36V, VOUT = 0V
0
1
µA
Output Disconnect PNP On, D3 = 3V, VOUT = 2.5V
10
15
mA
Minimum D3 Voltage for Proper Output
Disconnect PNP Operation
3
V
D4 LED Open-Circuit Voltage
38
42
44
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 LT1942 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical controls.
Note 3: Current flows out of the pin.
Note 4: Current limit guaranteed by design and/or correlation to static test.
Note 5: VCESAT 100% tested at wafer level.
TYPICAL PERFOR A CE CHARACTERISTICS
VFB1 Voltage
1.28
1.27
1.26
1.25
1.24
1.23
1.22
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1942 G01
NFB2 Voltage
–145
–146
–147
–148
–149
–150
–151
–152
–153
–154
–155
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1942 G02
VFB3 Voltage
1.28
1.27
1.26
1.25
1.24
1.23
1.22
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1942 G01
1942fb
4
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