Datasheet

LT3507A
5
3507af
TYPICAL PERFORMANCE CHARACTERISTICS
V
FB
vs Temperature Frequency vs R
T
Frequency vs Temperature
Frequency vs V
FB
(Foldback) I
TRK/SS
vs Temperature
Efficiency 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
Efficiency vs Load Current,
Channels 2 and 3, V
OUT
= 3.3V
I
OUT
(A)
0
40
EFFICIENCY (%)
50
60
70
80
90
0.3 0.6
0.9 1.2 1.5 1.8
3507A G01
2.1 2.4 2.7
V
IN
= 6V
V
IN
= 12V
V
IN
= 36V
INDUCTOR: NIC NPIM74C4R7MTRF
f
SW
= 450kHz
I
OUT
(A)
0
40
EFFICIENCY (%)
50
60
70
80
100
0.3
0.6 0.9 1.2
3507A G02
1.5 1.8
90
V
IN
= 6V
V
IN
= 12V
V
IN
= 36V
INDUCTOR: NIC NPIM74C8R2MTRF
f
SW
= 450kHz
I
SW
(A)
0
V
CESAT
(V)
0.6
0.4
0.5
0.2
0.3
0.1
0
2.51
3507A G03
31.5 20.5
CHANNELS 2 AND 3
CHANNEL 1
T
A
= 25°C
I
SW
(A)
0
0
I
BOOST
(mA)
20
40
60
0.5
1.0
1.5 2.0
3507A G04
2.5
80
100
10
30
50
70
90
3.0
CHANNELS 2, 3
CHANNEL 1
TEMPERATURE (°C)
–50
V
FB
(mV)
805
803
802
801
800
799
804
797
798
796
795
130–10
3507A G05
15090705030 110–30
R
T
(kΩ)
0
FREQUENCY (MHz)
1.5
2.0
2.5
160
3507A G06
1.0
0.5
0
20 40 60
80 100
120 140 180
200
TEMPERATURE (°C)
–50
FREQUENCY DEVIATION (%)
0.5
–0.5
–1.0
–1.5
0.0
–2.0
130–10
3507A G07
15090705030 110–30
V
FB
(V)
0
FRERQUENCY (kHz)
1200
800
600
400
200
1000
0
0.80.4
3507A 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
3507A G09
15090705030 110–30