LT1912 Linear Technology Corporation, LT1912 Datasheet - Page 4

• Manufacturer Part Number: LT1912
• Description: Step-Down Switching Regulator
• Manufacturer: Linear Technology Corporation

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LT1912
TYPICAL PERFOR A CE CHARACTERISTICS
4
100
3.5
3.0
2.5
2.0
1.5
1.0
90
80
70
60
50
0
5
Effi ciency
Maximum Load Current
V
OUT
0.2 0.4 0.6 0.8
= 5V
V
10
IN
= 24V
MINIMUM
V
TYPICAL
LOAD CURRENT (A)
IN
INPUT VOLTAGE (V)
= 12V
15
700
600
500
400
300
200
100
0
1.0
0
Switch Voltage Drop
L: NEC PLC-0745-5R6
f: 500kHz
V
1.2 1.4 1.6 1.8 2.0
20
IN
= 34V
500
W
SWITCH CURRENT (mA)
V
L = 4.7μH
f = 500kHz
25
OUT
1000
1912 G01
= 5V
1912 G04
U
30
1500
2000
4.0
3.5
3.0
2.5
2.0
1.5
1.0
85
80
75
70
65
60
55
90
50
0
Effi ciency
0 0.2 0.4 0.6 0.8
Switch Current Limit
V
1912 G07
OUT
2500
= 3.3V
20
V
V
IN
IN
LOAD CURRENT (A)
= 12V
DUTY CYCLE (%)
= 24V
40
1.0
L: NEC PLC-0745-5R6
f: 500kHz
1.2 1.4 1.6 1.8 2.0
60
V
IN
80
70
60
50
40
30
20
10
0
= 7V
Boost Pin Current
0
V
IN
80
= 34V
1912 G02
500
T
1912 G05
A
SWITCH CURRENT (mA)
100
= 25°C unless otherwise noted.
1000
3.5
2.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
4.5
4.0
3.0
2.0
1.5
1.0
0.5
1500
0
–50
5
Maximum Load Current
Switch Current Limit
–25
2000
10
0
TYPICAL
MINIMUM
1912 G08
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
TEMPERATURE (°C)
INPUT VOLTAGE (V)
2500
25
15
50
20
75
100
V
L = 4.7μH
f = 500kHz
OUT
25
= 3.3V
125
1912 G03
1912 G06
1912f
150
30