LT3570(RevA) 查看數據表（PDF） - Linear Technology
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LT3570 Datasheet PDF : 20 Pages
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LT3570
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN1,2,3 = 12V, VSHDN1,2,3 = 12V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Voltage (VIN1)
Minimum Operating Voltage (VIN2)
Shutdown Current (Note 4)
VIN1 Quiescent Current
VIN2 Quiescent Current
VIN3 Quiescent Current
Bias Quiescent Current
VSHDN1,2,3 Pin Threshold
VSHDN1,2,3 Pin UVLO
VSHDNX Pin Current
Switching Frequency
Maximum Duty Cycle
Synchronous Frequency Threshold
(Note 3)
l
2.1
2.5
V
(Note 3)
l
2.1
2.5
V
VSHDN1,2,3 = 0V
0
1.5
μA
VSHDN1 = 12V, VSHDN2,3 = 0V, VC1 = 0.4V (Not Switching)
VSHDN1 = 0V, VSHDN2,3 = 12V
3.2
4.5
mA
65
150
μA
VSHDN1,3 = 0V, VSHDN2 = 12V, VC2 = 0.4V (Not Switching)
VSHDN1,3 = 12V, VSHDN2 = 0V
3.5
4.5
mA
3.5
4.5
mA
VSHDN1,2 = 0V, VSHDN3 = 12V
VSHDN1,2 = 12V, VSHDN3 = 0V
700
950
μA
0
1.5
μA
VBIAS = 2.5V
2.3
3.1
mA
IVIN2 > 100μA
0.3
1.4
V
l 1.1
1.25
1.4
V
VSHDNX = 12V, VSHDNY,Z = 0V (Note 5)
VSHDN1,2,3 = 0V
RT = 44.2k
RT = 7.87k
RT = 44.2k
RT = 7.87k
30
50
μA
0.1
1.5
μA
450
500
550
kHz
1900 2100 2300
kHz
95
%
80
%
0.3
1.5
V
Synchronous Frequency Ratio, fSYN/fOSC
Synchronous Frequency Minimum On/Off
Time
RT = 44.2k
RT = 7.87k
1.3
1.3
50
ns
FB1,2,3 Pin Voltage
l 772
788
804
mV
FB1,2,3 Pin Voltage Line Regulation
FB1,2 Pin Bias Current
FB3 Pin Bias Current
SS1,2 Pin Source Current
VC1,2 Pin Source Current
VC1,2 Pin Sink Current
SW1
VVIN1,2,3 = 2.5V to 40V, VC1,2 = 1V
VFB1,2 = 800mV, VC1,2 = 1V (Note 6)
VFB3 = 800mV (Note 6)
VSS1,2 = 500mV
VFB1,2 = 600mV
VFB1,2 = 1V
0.01
%/V
30
200
nA
30
200
nA
4.5
μA
12
μA
12
μA
Error Amplifier 1 Transconductance
190
μMho
Error Amplifier 1 Voltage Gain
100
V/V
VC1 Pin Switching Threshold
VC1 to SW1 Current Gain
SW1 Current Limit
(Note 7)
750
mV
5.9
A/V
1.5
2.4
3.1
A
SW1 VCESAT
SW1 Leakage Current
ISW1 = 1A (Note 7)
SW1 = 40V, VSHDN1 = 0V
240
mV
0.2
5
μA
3570fa
3
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