LT1942(RevA) 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: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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
1942fa
4
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