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LT1941 Datasheet(PDF) 3 Page - Linear Technology

Part # LT1941
Description  Triple Monolithic Switching Regulator
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1941 Datasheet(HTML) 3 Page - Linear Technology

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3
LT1941
1941f
The q 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)
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
12GOOD Voltage Output Low
I12GOOD = 125µA
0.2
0.4
V
12GOOD Leakage
V12GOOD = 2V, VIN = 12V
10
400
nA
PGOOD Voltage Output Low
IPGOOD = 200µA
0.2
0.4
V
PGOOD Pin Leakage
VPGOOD = 2V
10
400
nA
3A Step-Down
FB1 Voltage
618
628
638
mV
q
613
638
mV
FB1 Pin Bias Current
q
50
500
nA
PGOOD1 Threshold Offset
VFB Rising
54
mV
Frequency Shift Threshold on FB1
0.35
V
Error Amplifier Transconductance
1700
µMhos
Error Amplifier Voltage Gain
500
V/V
VC Switching Threshold
0.9
V
VC1 to Switch Current Gain
5A/V
Switch 1 Current Limit (Note 3)
VIN = 12V, VBOOST1, VBOOST2 = 15V
q
3
4.3
6
A
Switch 1 VCESAT (Note 7)
ISW = 2.5A
400
600
mV
BOOST1 Pin Current
ISW = 2.5A
40
60
mA
Switch 1 Leakage Current
0.01
10
µA
Minimum Boost Voltage Above Switch (Note 4)
1.8
2.5
V
Maximum Duty Cycle
q
78
88
%
2A Step-Down
FB2 Voltage
618
628
638
mV
q
613
638
mV
FB2 Pin Bias Current
q
50
500
nA
PGOOD2 Threshold Offset
VFB Rising
54
mV
Frequency Shift Threshold on FB2
0.35
V
Error Amplifier Transconductance
1700
µMhos
Error Amplifier Voltage Gain
500
V/V
VC Switching Threshold
0.9
V
VC2 to Switch Current Gain
3.6
A/V
Switch 2 Current Limit (Note 3)
VIN = 12V, VBOOST1, VBOOST2 = 15V
q
2
2.9
4.1
A
Switch 2 VCESAT (Note 7)
ISW = 1.5A
450
600
mV
BOOST2 Pin Current
ISW = 1.5A
26
40
mA
Switch 2 Leakage Current
0.01
10
µA
Minimum Boost Voltage Above Switch (Note 4)
1.8
2.5
V
Maximum Duty Cycle
q
78
88
%
1.5A Inverting/Boost
FB3 Voltage
1.23
1.25
1.27
V
q
1.22
1.27
V
FB3 Pin Bias Current
q
800
1400
nA
NFB Voltage
q
–15
0
15
mV
NFB Pin Bias Current
q
60
500
nA



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