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
SW2
Error Amplifier 2 Transconductance
195
μMho
Error Amplifier 2 Voltage Gain
100
V/V
VC2 Pin Switching Threshold
VC2 to SW2 Current Gain
SW2 Current Limit
(Note 7)
700
mV
5.4
A/V
1.5
2.4
3.1
A
SW2 VCESAT
SW2 Leakage Current
BOOST Pin Current
LDO
ISW2 = 1A (Note 7)
SW2 = 0V, VIN2 = 40V, VSHDN2 = 0V
ISW2 = 0.5A
ISW2 = 1.5A
240
mV
0.2
5
μA
15
mA
30
mA
LDO Maximum Output Current
VFB3 = 600mV
10
20
mA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3570E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3570I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: VIN2 supplies power for the part. VIN1 supplies power only to the
boost converter. VIN3 supplies power only to the LDO Controller.
Note 4: Shutdown current is for each individual input current.
Note 5: Current flows into the pin.
Note 6: Current flows out of the pin.
Note 7: Switch current limit and switch VCESAT guaranteed by design
and/or correlation to static test.
Note 8: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
range when overtemperature protection is active. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Voltage vs Temperature
0.800
0.795
0.790
0.785
0.780
0.775
0.770
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3570 G01
Frequency vs Temperature
2500
2000
RT = 7.87k
1500
1000
500
RT = 20k
RT = 44.2k
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3570 G02
Soft-Start Current vs Temperature
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3570 G03
3570fa
4
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