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3570 Datasheet(PDF) 3 Page - Linear Technology

Part # 3570
Description  1.5A Buck Converter, 1.5A Boost Converter and LDO Controller
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

3570 Datasheet(HTML) 3 Page - Linear Technology

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LT3570
3
3570fa
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)
(Note 3)
l
2.1
2.5
V
Minimum Operating Voltage (VIN2)
(Note 3)
l
2.1
2.5
V
Shutdown Current (Note 4)
VSHDN1,2,3 = 0V
0
1.5
μA
VIN1 Quiescent Current
VSHDN1 = 12V, VSHDN2,3 = 0V, VC1 = 0.4V (Not Switching)
VSHDN1 = 0V, VSHDN2,3 = 12V
3.2
65
4.5
150
mA
μA
VIN2 Quiescent Current
VSHDN1,3 = 0V, VSHDN2 = 12V, VC2 = 0.4V (Not Switching)
VSHDN1,3 = 12V, VSHDN2 = 0V
3.5
3.5
4.5
4.5
mA
mA
VIN3 Quiescent Current
VSHDN1,2 = 0V, VSHDN3 = 12V
VSHDN1,2 = 12V, VSHDN3 = 0V
700
0
950
1.5
μA
μA
Bias Quiescent Current
VBIAS = 2.5V
2.3
3.1
mA
VSHDN1,2,3 Pin Threshold
IVIN2 > 100μA
0.3
1.4
V
VSHDN1,2,3 Pin UVLO
l
1.1
1.25
1.4
V
VSHDNX Pin Current
VSHDNX = 12V, VSHDNY,Z = 0V (Note 5)
VSHDN1,2,3 = 0V
30
0.1
50
1.5
μA
μA
Switching Frequency
RT = 44.2k
RT = 7.87k
450
1900
500
2100
550
2300
kHz
kHz
Maximum Duty Cycle
RT = 44.2k
RT = 7.87k
95
80
%
%
Synchronous Frequency Threshold
0.3
1.5
V
Synchronous Frequency Ratio, fSYN/fOSC
RT = 44.2k
RT = 7.87k
1.3
1.3
Synchronous Frequency Minimum On/Off
Time
50
ns
FB1,2,3 Pin Voltage
l
772
788
804
mV
FB1,2,3 Pin Voltage Line Regulation
VVIN1,2,3 = 2.5V to 40V, VC1,2 = 1V
0.01
%/V
FB1,2 Pin Bias Current
VFB1,2 = 800mV, VC1,2 = 1V (Note 6)
30
200
nA
FB3 Pin Bias Current
VFB3 = 800mV (Note 6)
30
200
nA
SS1,2 Pin Source Current
VSS1,2 = 500mV
4.5
μA
VC1,2 Pin Source Current
VFB1,2 = 600mV
12
μA
VC1,2 Pin Sink Current
VFB1,2 = 1V
12
μA
SW1
Error Amplifier 1 Transconductance
190
μMho
Error Amplifier 1 Voltage Gain
100
V/V
VC1 Pin Switching Threshold
750
mV
VC1 to SW1 Current Gain
5.9
A/V
SW1 Current Limit
(Note 7)
1.5
2.4
3.1
A
SW1 VCESAT
ISW1 = 1A (Note 7)
240
mV
SW1 Leakage Current
SW1 = 40V, VSHDN1 = 0V
0.2
5
μA



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