LT3684
TYPICAL PERFORMANCE CHARACTERISTICS (T = 25°C unless otherwise noted)
A
Efficiency (V
= 3.3V)
Efficiency
Efficiency (V
= 5.0V)
OUT
OUT
100
90
90
85
80
75
70
65
60
55
50
90
V
= 7V
IN
V
= 12V
IN
85
80
V
V
= 12V
= 24V
IN
IN
V
= 24V
V
= 12V
V
= 24V
IN
IN
IN
75
70
65
60
55
80
70
60
50
V
= 3.3V
OUT
L: NEC PLC-0745-4R7
f = 800kHz
L: NEC PLC-0745-4R7
f = 800kHz
L = 10µH
LOAD = 1A
50
0.5
1
2
2.5
3
0
1.5
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
SWITCHING FREQUENCY (MHz)
LOAD CURRENT (A)
3684 G03
3684 G01
3684 G02
Maximum Load Current
Maximum Load Current
Switch Current Limit
4.0
3.5
3.0
4.0
3.5
3.0
4.0
3.5
3.0
TYPICAL
TYPICAL
2.5
2.0
2.5
2.0
2.5
2.0
MINIMUM
MINIMUM
V
T
= 3.3V
V
T
= 5V
OUT
A
OUT
A
= 25°C
= 25°C
1.5
1.0
1.5
1.0
1.5
1.0
L = 4.7µH
L = 4.7µH
f = 800kHz
f = 800kHz
20
60
40
DUTY CYCLE (%)
80
100
10
20
INPUT VOLTAGE (V)
25
30
0
5
15
10
20
INPUT VOLTAGE (V)
25
30
5
15
3684 G06
3684 G04
3684 G05
Switch Current Limit
Switch Voltage Drop
Boost Pin Current
4.5
4.0
3.0
2.5
2.0
1.5
1.0
0.5
0
90
80
70
60
50
40
30
20
10
700
600
DUTY CYCLE = 10 %
500
400
300
200
100
DUTY CYCLE = 90 %
0
0
–50 –25
0
25
50
75 100 125
2000
3000 3500
0
500 1000 1500
2500
0
500 1000 1500
3500
2000 2500 3000
TEMPERATURE (°C)
SWITCH CURRENT (mA)
SWITCH CURRENT (mA)
3684 G07
3684 G08
3684 G09
3684f
4
Linear [ Linear ]
