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
0
TYP
–0.2
350
850
–120
110
2.4
MAX
UNITS
FB Input Current
●
–0.4
μA
FB to V Voltage Gain
0.4V < V < 0.9V
150
500
–85
70
C
C
FB to V Transconductance
ΔI = ±10μA
VC
●
●
●
1300
–165
165
μMho
μA
μA
A/V
V
C
V Pin Source Current
C
V
V
= 1V
FB
FB
V Pin Sink Current
C
= 1.4V
V Pin to Switch Current Transconductance
C
V Pin Minimum Switching Threshold
C
Duty Cycle = 0%
0.3
V Pin 1.5A I Threshold
0.9
V
C
SW
Maximum Switch Duty Cycle
V = 1.2V, I = 100mA
●
80
75
70
90
80
75
%
%
%
C
SW
V = 1.2V, I = 1A, 25°C ≤ T ≤ 125°C
C
SW
A
V = 1.2V, I = 1A, T ≤ 25°C
C
SW
A
SHDN Threshold Voltage
●
●
1.28
–7
4
1.35
–10
7
1.42
–13
10
V
μA
SHDN Input Current (Shutting Down)
SHDN Threshold Current Hysteresis
SYNC Threshold Voltage
SHDN = 60mV Above Threshold
SHDN = 100mV Below Threshold
μA
1.5
2.2
2
V
SYNC Input Frequency
1.5
MHz
kΩ
SYNC Pin Resistance
I
= 1mA
20
SYNC
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 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.
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.
1961fa
3
Linear [ Linear ]
