LT1912_15 Datasheet, PDF (4/24 Pages) Linear Technology – 36V, 2A, 500kHz Step-Down Switching Regulator

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