LT3570
4
3570fb
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SW2
Error Ampli er 2 Transconductance
195
糓ho
Error Ampli er 2 Voltage Gain
100
V/V
V
C2
Pin Switching Threshold
700
mV
V
C2
to SW2 Current Gain
5.4
A/V
SW2 Current Limit
(Note 7)
1.5 2.4 3.1
A
SW2 V
CESAT
I
SW2
= 1A (Note 7)
240
mV
SW2 Leakage Current
SW2 = 0V, V
IN2
= 40V, V
SHDN2
= 0V
0.2 5
糀
BOOST Pin Current
I
SW2
= 0.5A
I
SW2
= 1.5A
15
30
mA
mA
LDO
LDO Maximum Output Current
V
FB3
= 600mV
10
20
mA
ELECTRICAL CHARACTERISTICS
The l denotes the speci cations which apply over the full operating
temperature range, otherwise speci cations are at T
A
= 25癈. V
IN1,2,3
= 12V, V
SHDN1,2,3
= 12V unless otherwise noted.
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 speci cations
from 0癈 to 125癈 junction temperature. Speci cations over the 40癈
to 125癈 operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3570I is guaranteed over the full 40癈 to 125癈 operating junction
temperature range.
Note 3: V
IN2
supplies power for the part. V
IN1
supplies power only to the
boost converter. V
IN3
supplies power only to the LDO Controller.
Note 4: Shutdown current is for each individual input current.
Note 5: Current ows into the pin.
Note 6: Current ows out of the pin.
Note 7: Switch current limit and switch V
CESAT
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 speci ed maximum operating junction temperature may impair
device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Voltage vs Temperature
Frequency vs Temperature
Soft-Start Current vs Temperature
TEMPERATURE (癈)
50
0.770
0.775
0.780
0.785
0.790
0
50
100
150
3570 G01
0.795
0.800
25
25
75
125
TEMPERATURE (癈)
50
1500
2000
2500
25
75
150
3570 G02
1000
500
0
25 0
50
100 125
R
T
= 7.87k
R
T
= 20k
R
T
= 44.2k
TEMPERATURE (癈)
50
4.4
4.6
4.8
25 50 75 100 125
3570 G03
4.2
4.0
25 0
150
3.8
3.6
5.0
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