LT1961 查看數據表（PDF） - Linear Technology
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LT1961 Datasheet PDF : 16 Pages
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LT1961
ELECTRICAL CHARACTERISTICS The●denotesthespecificationswhichapplyoverthefulloperatingtemperature
range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.8V, SHDN, SYNC and switch open unless otherwise noted.
PARAMETER
CONDITION
MIN TYP MAX UNITS
FB Input Current
●0
– 0.2 – 0.4
μA
FB to VC Voltage Gain
0.4V < VC < 0.9V
150 350
FB to VC Transconductance
VC Pin Source Current
ΔIVC = ±10μA
VFB = 1V
● 500
● – 85
850
– 120
1300
– 165
μMho
μA
VC Pin Sink Current
VFB = 1.4V
● 70
110 165
μA
VC Pin to Switch Current Transconductance
VC Pin Minimum Switching Threshold
Duty Cycle = 0%
2.4
A/V
0.3
V
VC Pin 1.5A ISW Threshold
0.9
V
Maximum Switch Duty Cycle
SHDN Threshold Voltage
VC = 1.2V, ISW = 100mA
VC = 1.2V, ISW = 1A, 25°C ≤ TA ≤ 125°C
VC = 1.2V, ISW = 1A, TA ≤ 25°C
● 80
90
%
75
80
%
70
75
%
● 1.28 1.35 1.42
V
SHDN Input Current (Shutting Down)
SHDN = 60mV Above Threshold
● –7
–10 –13
μA
SHDN Threshold Current Hysteresis
SHDN = 100mV Below Threshold
4
7
10
μA
SYNC Threshold Voltage
1.5
2.2
V
SYNC Input Frequency
1.5
2
MHz
SYNC Pin Resistance
ISYNC = 1mA
20
kΩ
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 LT1961E 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
LT1961I is guaranteed over the – 40ºC to 125ºC operating junction
temperature range.
Note 3: Minimum input voltage is defined as the voltage where the
internal regulator enters lockout. Actual minimum input voltage to
maintain a regulated output will depend on output voltage and load
current. See Applications Information.
1961fa
3
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