LT1941 Ver la hoja de datos (PDF) - Linear Technology
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LT1941 Datasheet PDF : 24 Pages
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LT1941
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN, VBIAS1, VBIAS2 = 5V, VBOOST1, VBOOST2 = 8V, unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Switching Phase
SW1 to SW2
SW1 to SW3
150
180
210
Deg
–30
0
30
Deg
Foldback Frequency
RUN/SS Current
VFB = 0V
200
kHz
1
2
3
μA
RUN/SS Threshold
0.4
0.6
V
5GOOD Threshold
5GOOD Voltage Output Low
5GOOD Leakage
12GOOD Threshold
12GOOD Voltage Output Low
12GOOD Leakage
PGOOD Voltage Output Low
PGOOD Pin Leakage
3A Step-Down
VIN Rising
I5GOOD = 125μA, VIN = 4V
V5GOOD = 2V
VIN Rising
I12GOOD = 125μA
V12GOOD = 2V, VIN = 12V
IPGOOD = 200μA
VPGOOD = 2V
4.5
V
0.2
0.4
V
10
400
nA
10.8
V
0.2
0.4
V
10
400
nA
0.2
0.4
V
10
400
nA
FB1 Voltage
618
628
638
mV
l 613
638
mV
FB1 Pin Bias Current
l
50
500
nA
PGOOD1 Threshold Offset
Frequency Shift Threshold on FB1
VFB Rising
54
mV
0.35
V
Error Amplifier Transconductance
1700
μMhos
Error Amplifier Voltage Gain
500
V/V
VC Switching Threshold
VC1 to Switch Current Gain
Switch 1 Current Limit (Note 3)
Switch 1 VCESAT (Note 7)
BOOST1 Pin Current
Switch 1 Leakage Current
VIN = 12V, VBOOST1, VBOOST2 = 15V
ISW = 2.5A
ISW = 2.5A
0.9
V
5
A/V
l3
4.3
6
A
400
600
mV
40
60
mA
0.01
10
μA
Minimum Boost Voltage Above Switch (Note 4)
1.8
2.5
V
Maximum Duty Cycle
l 78
88
%
2A Step-Down
FB2 Voltage
618
628
638
mV
l 613
638
mV
FB2 Pin Bias Current
l
50
500
nA
PGOOD2 Threshold Offset
Frequency Shift Threshold on FB2
VFB Rising
54
mV
0.35
V
Error Amplifier Transconductance
1700
μMhos
Error Amplifier Voltage Gain
500
V/V
VC Switching Threshold
VC2 to Switch Current Gain
Switch 2 Current Limit (Note 3)
Switch 2 VCESAT (Note 7)
BOOST2 Pin Current
VIN = 12V, VBOOST1, VBOOST2 = 15V
ISW = 1.5A
ISW = 1.5A
0.9
V
3.6
A/V
l2
2.9
4.1
A
450
600
mV
26
40
mA
1941fb
3
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