LT1943 데이터 시트보기 (PDF) - Linear Technology
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LT1943 Datasheet PDF : 20 Pages
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LT1943
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. RUN-SS, SS-234 = 2.5V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SWITCH 4 (350mA INVERTER)
FB4 Voltage
1.23 1.25 1.27
V
● 1.22
1.27
V
FB4 Voltage Line Regulation
FB4 Pin Bias Current
4.5V < VIN < 22V
(Note 4)
0.01 0.03
%/V
●
100 600
nA
NFB4 Voltage (VFB4-VNFB4)
1.215 1.245 1.275
V
● 1.205
1.275
V
NFB4 Voltage Line Regulation
NFB4 Pin Bias Current
4.5V < VIN < 22V
(Note 5)
0.01 0.03
%/V
100
600
nA
Error Amplifier 4 Voltage Gain
200
V/V
Error Amplifier 4 Transconductance
∆I = 5µA
450
µmhos
Switch 4 Current Limit
● 0.35
0.5
0.7
A
Switch 4 VCESAT
Switch 4 Leakage Current
ISW4 = 0.3A
FB4 = 1.5V
260 390
mV
0.1
1
µA
BIAS Pin Current due to SW4
Maximum Duty Cycle (SW4)
ISW4 = 0.3A
15
mA
84
88
%
● 83
%
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1943E 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 process controls.
Note 3: The CT pin is held low until FB1, FB2, FB3 and FB4 all ramp above
the FB threshold offset.
Note 4: Current flows into FB1, FB2, FB3 and FB4 pins.
Note 5: Current flows out of NFB4 pin.
Note 6: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at high duty cycle.
Note 7: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Output Current
for VLOGIC = 3.3V
2.8
TA = 25°C
2.6
2.4
L1 = 4.7µH
2.2
L1 = 3.3µH
2.0
1.8
1.6
1.4
1.2
0
5
10
15
INPUT VOLTAGE (V)
20
1943 G01
SW1 Current Limit vs Duty Cycle
5
TA = 25°C
4
TYPICAL
3
2
MINIMUM
1
0
0
20
40
60
80
100
DUTY CYCLE (%)
1943 G02
4
SW1 Current Limit
4.5
4.0
3.5
3.0
2.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1943 G03
1943fa
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