Datasheet

LT1912
4
1912fa
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise noted.
SWITCH CURRENT (mA)
0
BOOST PIN CURRENT (mA)
10
30
40
50
80
1912 G08
20
60
70
0 1500500 1000 2000 2500
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
100
0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2.01.0
1912 G01
60
90
80
70
V
IN
= 24V
V
IN
= 34V
V
IN
= 12V
L: NEC PLC-0745-5R6
f: 500kHz
V
OUT
= 5V
0 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2.01.0
LOAD CURRENT (A)
50
EFFICIENCY (%)
90
1912 G02
60
65
55
85
80
70
75
V
IN
= 12V
V
IN
= 7V
L: NEC PLC-0745-5R6
f: 500kHz
V
IN
= 24V
V
IN
= 34V
V
OUT
= 3.3V
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
1912 G03
2.5
10 20
1.5
1.0
4.0
3.5
3.0
2.0
25
30
TYPICAL
MINIMUM
V
OUT
= 3.3V
L = 4.7µH
f = 500kHz
SWITCH CURRENT (mA)
0
400
500
700
1500
1912 G07
300
200
500 1000 2000 2500
100
0
600
VOLTAGE DROP (mV)
Efficiency
Efficiency
Boost Pin Current
Switch Voltage Drop
Maximum Load Current
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT(A)
40
1912 G05
2.5
20 60
1.5
1.0
4.0
3.5
3.0
2.0
80 100
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
1912 G04
2.5
10 20
1.5
1.0
3.5
3.0
2.0
25
30
TYPICAL
MINIMUM
V
OUT
= 5V
L = 4.7µH
f = 500kHz
TEMPERATURE (°C)
SWITCH CURRENT LIMIT (A)
2.0
2.5
3.5
3.0
1912 G06
1.5
1.0
0
0.5
4.5
4.0
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
–50 25–25 0 50 75 100 150125
Switch Current Limit Switch Current Limit
Maximum Load Current