LT3507
3
3507fa
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
, V
IN2
, V
IN3
= 12V, V
BOOST1
, V
BOOST2
, V
BOOST3
= 17V, unless
otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
V
C
Source Current
V
C
= 0.6V
20
糀
V
C
Sink Current
V
C
= 0.6V
30
糀
V
C
Clamp Voltage
1.7
V
Switching Frequency
R
T
= 40.2k
l 0.9
1.1 MHz
Switching Phase
SW1 to SW2,3, R
T
= 40.2k
180
Deg
Foldback Frequency
V
FB
= 0V, R
T
= 40.2k
120
kHz
Frequency Shift Threshold on FB
0.4
V
RUN Threshold
1 1.5
V
PGOOD Output Voltage Low
I
PGOOD
= 200糀
0.2 0.4
V
PGOOD Pin Leakage
V
PGOOD
= 2V
10 400
nA
PGOOD Threshold Offset
V
FB
Rising
58 80 105
mV
Feedback Pin Voltage
l
788 800 812
mV
Feedback Pin Bias Current
l
50 500
nA
Error Ampli er Transconductance
330
糞
Error Ampli er Voltage Gain
500
V/V
V
C
Switching Threshold
0.9
V
Switch Leakage Current
0.01 10
糀
Minimum Boost Voltage Above Switch (Note 4)
1.8 2.5
V
Converter 1
V
C1
to Switch Current Gain
5
A/V
Switch 1 Current Limit (Note 3)
Duty Cycle = 15%
l
3 4.3 6
A
Switch 1 V
CESAT
I
SW1
= 2A
400 600
mV
BOOST1 Operating Current
I
SW1
= 2A
40 60
mA
Converter 2
V
C2
to Switch Current Gain
3.6
A/V
Switch 2 Current Limit (Note 3)
Duty Cycle = 15%
l
2 2.9 4
A
Switch 2 V
CESAT
I
SW2
= 1.5A
350 500
mV
BOOST2 Operating Current
I
SW2
= 1.5A
40 60
mA
Converter 3
V
C3
to Switch Current Gain
3.6
A/V
Switch 3 Current Limit (Note 3)
Duty Cycle = 15%
l
2 2.9 4
A
Switch 3 V
CESAT
I
SW3
= 1.5A
350 500
mV
BOOST3 Operating Current
I
SW3
= 1.5A
40 60
mA
LDO Regulator
Feedback Pin Voltage
l 788 800 812
mV
Feedback Pin Bias Current
150 500
nA
Error Ampli er Voltage Gain
1100
V/V
Line Regulation
V
IN
from 5V to 36V
0.05
%/V
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