Datasheet

LT3506/LT3506A
4
3506afc
Effi ciency, V
OUT
= 1.8V (LT3506A) Effi ciency, V
OUT
= 3.3V (LT3506) Effi ciency, V
OUT
= 5V (LT3506)
Maximum Load Current,
V
OUT
= 1.8V (LT3506A)
Maximum Load Current,
V
OUT
= 3.3V (LT3506A) Switch V
CESAT
Boost Pin Current Current Limit vs Duty Cycle
TYPICAL PERFORMANCE CHARACTERISTICS
I
OUT
(A)
0
EFFICIENCY (%)
70
75
80
85
1.0
3506 G01
65
60
0.2 0.6
1.41.2
0.4 0.8 1.6
55
50
90
V
OUT
= 1.8V
L = 2.2µH (COILCRAFT LPS4012-222)
T
A
= 25°C
V
IN
= 4.5V
V
IN
= 10V
V
IN
= 7V
I
OUT
(A)
0
50
EFFICIENCY (%)
55
65
70
75
100
85
0.4
0.8
3506 G02
60
90
95
80
1.2
1.6
V
OUT
= 3.3V
L = 6.4µH (SUMIDA CR54-6R4)
T
A
= 25°C
V
IN
= 5V
V
IN
= 25V
V
IN
= 12V
I
OUT
(A)
0
50
EFFICIENCY (%)
55
65
70
75
100
85
0.4
0.8
3506 G03
60
90
95
80
1.2
1.6
V
OUT
= 5V
L = 10µH (COOPER UP1B-100)
T
A
= 25°C
V
IN
= 8V
V
IN
= 25V
V
IN
= 15V
INPUT VOLTAGE (V)*
0
LOAD CURRENT (A)
1.4
1.6
12 14
3506 G04
1.2
1.0
842
6
10
16
1.8
L = 2.2µH
L = 1.5µH
L = 1µH
T
A
= 25°C
INPUT VOLTAGE (V)*
0
LOAD CURRENT (A)
1.4
1.6
20
3506 G05
1.2
1.0
5
10
15
25
1.8
L = 4.7µH
L = 3.3µH
L = 2.2µH
SLOPE COMPENSATION REQUIRES
L > 2.2µH FOR V
IN
< 7 WITH V
OUT
= 3.3V
T
A
= 25°C
SW CURRENT (A)
0
SWITCH VOLTAGE (mV)
200
300
2.0
3506 G06
100
0
0.5
1.0
1.5
400
T
A
= 25°C
SWITCH CURRENT (A)
0
BOOST CURRENT (mA)
20
30
2.0
3506 G07
10
0
0.5
1.0
1.5
40
T
A
= 25°C
DUTY CYCLE (%)
0
CURRENT LIMIT (A)
TYPICAL
80
3506 G08
20
40
60
100
3.0
2.5
2.0
1.5
1.0
0.5
0
MINIMUM
T
A
= 25°C