LT1374C Linear Technology, LT1374C Datasheet - Page 5

• Manufacturer Part Number: LT1374C
• Description: 4.5A/ 500kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

TYPICAL PERFORMANCE CHARACTERISTICS
Kool M is a registered trademark of Magnetics, Inc.
500
400
300
200
100
100
4.5
4.0
3.5
3.0
40
30
90
80
70
60
50
10
20
0
0
0
0
0
Frequency Foldback
Maximum Load Current
at V
BOOST Pin Current
DUTY CYCLE = 100%
V
OUT
OUT
0.5
= 10V
5
1
FEEDBACK PIN VOLTAGE (V)
= 10V
SWITCH CURRENT (A)
INPUT VOLTAGE (V)
10
SWITCHING
FREQUENCY
1.0
FEEDBACK PIN
CURRENT
2
1.5
15
3
W
L = 20 H
L = 10 H
2.0
20
L = 5 H
4
1374 G10
1374 G13
1374 G16
U
2.5
25
5
1.4
1.2
1.0
0.8
0.6
0.4
550
540
530
520
510
500
490
480
470
460
450
–50
4.5
4.0
3.5
3.0
V
– 50
C
SHUTDOWN
Switching Frequency
Maximum Load Current
at V
0
Pin Shutdown Threshold
–25
V
OUT
–25
JUNCTION TEMPERATURE ( C)
OUT
= 3.3V
5
0
= 3.3V
0
TEMPERATURE ( C)
INPUT VOLTAGE (V)
25
10
25
50
50
15
L = 10 H
L = 20 H
L = 5 H
75
75
100
20
1374 G11
100
1374 G11
1374 G14
125
125
25
0.001
0.01
1.0
0.1
0
Inductor Core Loss
6.4
6.2
5.6
5.4
5.2
5.0
6.0
5.8
4.5
4.0
3.5
3.0
CORE LOSS IS
INDEPENDENT OF LOAD
CURRENT UNTIL LOAD CURRENT FALLS
LOW ENOUGH FOR CIRCUIT TO GO INTO
DISCONTINUOUS MODE
V
OUT
1
Minimum Input Voltage
with 5V Output
0
Maximum Load Current
at V
MINIMUM
= 5V, V
RUNNING
VOLTAGE
V
5
OUT
OUT
INDUCTANCE ( H)
5
= 5V
IN
= 5V
10
= 10V, I
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
10
10
OUT
TYPE 52
POWDERED IRON
Kool M
PERMALLOY
15
= 125
= 1A
MINIMUM
STARTING
VOLTAGE
15
®
100
20
LT1374
L = 20 H
L = 10 H
L = 5 H
1374 G01
20
25
1374 G12
1374 G15
20
12
8
4
2
1.2
0.8
0.4
0.2
0.12
0.08
0.04
0.02
5
1000
25