Datasheet

LT3507
5
3507fa
TYPICAL PERFORMANCE CHARACTERISTICS
V
FB
vs Temperature Frequency vs R
T
Frequency vs Temperature
Frequency vs V
FB
(Foldback) I
TRK/SS
vs Temperature
Effi ciency vs Load Current,
Channel 1, V
OUT
= 1.8V
Switch V
CESAT
vs Switch Current,
Channels 1, 2 and 3
BOOST Pin Current vs Switch
Current, Channels 1, 2 and 3
Effi ciency vs Load Current,
Channels 2 and 3, V
OUT
= 3.3V
I
OUT
(A)
0
EFFICIENCY (%)
90
80
60
70
50
40
21
3507 G01
2.51.50.5
V
IN
= 6V
V
IN
= 12V
V
IN
= 36V
T
A
= 25°C
f
SW
= 450kHz
I
OUT
(A)
0
EFFICIENCY (%)
100
80
90
60
70
50
40
1.20.6
3507 G02
1.50.90.3
V
IN
= 6V
V
IN
= 12V
V
IN
= 36V
T
A
= 25°C
f
SW
= 450kHz
I
SW
(A)
0
V
SW
(V)
0.6
0.4
0.5
0.2
0.3
0.1
0
2.51
3507 G03
31.5 20.5
CHANNELS 2 & 3
CHANNEL 1
T
A
= 25°C
I
SW
(A)
0
I
BOOST
(mA)
100
80
70
60
50
40
90
20
30
10
0
2.51
3507 G04
31.5 20.5
CHANNELS 2 & 3
CHANNEL 1
T
A
= 25°C
TEMPERATURE (°C)
–50
V
FB
(mV)
805
803
802
801
800
799
804
797
798
796
795
130–10
3507 G05
15090705030 110–30
R
T
(kΩ)
FREQUENCY (MHz)
3507 G06
2.5
0.25
10 100
T
A
= 25°C
TEMPERATURE (°C)
–50
FREQUENCY DEVIATION (%)
0.5
–0.5
–1.0
–1.5
0.0
–2.0
130–10
3507 G07
15090705030 110–30
V
FB
(V)
0
FRERQUENCY (kHz)
1200
800
600
400
200
1000
0
0.80.4
3507 G08
10.60.2
R
T
= 40.2k
T
A
= 25°C
TEMPERATURE (°C)
–50
I
TRK/SS
(μA)
1.30
1.26
1.24
1.22
1.28
1.20
130–10
3507 G09
15090705030 110–30