LT3473 查看數據表（PDF） - Linear Technology
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LT3473 Datasheet PDF : 12 Pages
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LT3473/LT3473A
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 3V, SHDN = 3V, CTRL = 2V, unless otherwise specified.
PARAMETER
CONDITIONS
MIN TYP MAX
Switching Frequency
0.9
1.2
1.4
Maximum Duty Cycle
●
88
92
Switch Current Limit
● 1.2
Switch VCESAT
Switch Leakage Current
Schottky Forward Drop
Schottky Leakage Current
ISW = 100mA
VSW = 5V
ID = 100mA
CAP = 36V, SW = 0V
45
0.1
5
0.45
4
Disconnect PNP Voltage Drop
IOUT = 100µA, CAP = 20V
80
IOUT = 50mA, CAP = 20V
250
Disconnect PNP Quiescent Current
CAP = 20V
1.2
Disconnect PNP Leakage Current
SHDN = OUT = 0V, CAP = 20V
0.01 0.1
LTC3473A Only
NPN1 Voltage Drop
INE1 = 1mA
0.8
NPN1 Beta
INE1 = 1mA
60
NPN2 Voltage Drop
INE2 = 1mA
0.8
NPN2 Beta
INE2 = 1mA
60
UNITS
MHz
%
A
mV
µA
V
µA
mV
mV
µA
µA
V
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3473EDD and LT3473AEDE are 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 process controls.
Note 3: Failure to correctly solder the Exposed Pad of the package to the
PC board will result in a thermal resistance much higher than 40°C.
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Load Regulation (Feedback Taken
from CAP)
20.20
VIN = 3.6V
20.00
CAP
19.80
OUT
19.60
19.40
19.20
19.00
0
20
40
60
80
100
LOAD CURRENT (mA)
3473 G01
Feedback Voltage
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
CTRL VOLTAGE (V)
3473 G02
PGOOD Threshold Voltage
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0.5
1
1.5
2
CTRL VOLTAGE (V)
3473 G03
3473f
3
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