LT3506/LT3506A
TYPICAL PERFOR A CE CHARACTERISTICS
100
Efficiency, V
OUT
= 1.8V (LT3506A)
V
OUT
= 1.8V
L = 4.7µH (COILCRAFT MSS6122-472MLB)
90 T
A
= 25°C
80
EFFICIENCY (%)
70
60
50
40
V
IN
= 4.5V
V
IN
= 12V
V
IN
= 25V
0
0.2
0.4
1.0 1.2
OUTPUT CURRENT (A)
0.6
0.8
1.4
1.6
EFFICIENCY (%)
80
75
70
65
60
55
50
0
0.4
0.8
I
OUT
(A)
1.2
1.6
3506 G02
EFFICIENCY (%)
30
Maximum Load Current,
V
OUT
= 1.8V (LT3506A)
1.8
T
A
= 25°C
L = 2.2µH
LOAD CURRENT (A)
1.8
L = 1.5µH
1.4
L = 1µH
1.2
L = 3.3µH
1.4
L = 2.2µH
SWITCH VOLTAGE (mV)
1.6
LOAD CURRENT (A)
1.0
0
2
4
8
10 12
6
INPUT VOLTAGE (V)*
Boost Pin Current
40
T
A
= 25°C
3.0
2.5
BOOST CURRENT (mA)
30
CURRENT LIMIT (A)
2.0
20
MINIMUM
1.5
1.0
0.5
FREQUENCY (kHz)
10
0
0
1.0
1.5
0.5
SWITCH CURRENT (A)
U W
3506 G01
100
Efficiency, V
OUT
= 3.3V (LT3506)
100
Efficiency, V
OUT
= 5V (LT3506)
V
OUT
= 5V
95 L = 10µH (COOPER UP1B-100)
T
A
= 25°C
90
85
80
75
70
65
60
55
50
0
0.4
0.8
I
OUT
(A)
1.2
1.6
3506 G03
V
OUT
= 3.3V
95 L = 6.4µH (SUMIDA CR54-6R4)
T
A
= 25°C
90
85
V
IN
= 5V
V
IN
= 8V
V
IN
= 12V
V
IN
= 15V
V
IN
= 25V
V
IN
= 25V
Maximum Load Current,
V
OUT
= 3.3V (LT3506A)
SLOPE COMPENSATION REQUIRES
L > 2.2µH FOR V
IN
< 7 WITH V
OUT
= 3.3V
T
A
= 25°C
L = 4.7µH
400
Switch V
CESAT
T
A
= 25°C
1.6
300
200
1.2
100
14
16
1.0
0
5
15
20
10
INPUT VOLTAGE (V)*
25
3506 G05
0
0
0.5
1.0
SW CURRENT (A)
1.5
2.0
3506 G06
3506 G04
Current Limit vs Duty Cycle
T
A
= 25°C
TYPICAL
650
700
Frequency vs Temperature
1.20
1.15
FREQUENCY (MHz)
LT3506A
600
LT3506
550
1.10
1.05
2.0
3506 G07
0
0
20
60
40
DUTY CYCLE (%)
80
100
3506 G08
500
–50 –25
0
25
50
75
TEMPERATURE (°C)
100
1.00
125
3506 G10
3506afb
LINER [ LINEAR TECHNOLOGY ]
