LT1506 Linear Technology, LT1506 Datasheet - Page 5

• Manufacturer Part Number: LT1506
• Description: 4.5A/ 500kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

Kool M is a registered trademark of Magnetics, Inc.
Metglas is a registered trademark of AlliedSignal Inc.
*See “More Than Just Voltage Feedback” in the Applications Information section.
TYPICAL PERFORMANCE CHARACTERISTICS
3.8
3.6
3.4
3.0
500
400
300
200
100
4.4
4.2
4.0
3.2
2.8
2.6
7
6
5
4
3
2
1
0
0
5
Frequency Foldback
0
0
Maximum Load Current
at V
Current Limit Foldback
POSSIBLE UNDESIRED
STABLE POINT FOR
CURRENT SOURCE
LOAD*
OUT
0.5
20
7
FEEDBACK PIN VOLTAGE (V)
= 5V
OUTPUT VOLTAGE (%)
INPUT VOLTAGE (V)
SWITCHING
FREQUENCY
1.0
40
FEEDBACK PIN
CURRENT
9
RESISTOR
1.5
CHARACTERISTICS
60
11
LOAD
FOLDBACK
MOS LOAD
L= 1.8 H
L= 10 H
CURRENT
W
L= 5 H
L= 3 H
SOURCE
2.0
13
80
LOAD
1506 G17
1506 G18
1506 G10
U
100
2.5
15
550
540
530
520
510
500
490
480
470
460
450
4.4
1.4
1.2
1.0
0.8
0.6
0.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
– 50
–50
4
Switching Frequency
Maximum Load Current
at V
V
C
SHUTDOWN
Pin Shutdown Threshold
–25
–25
OUT
JUNCTION TEMPERATURE ( C)
6
= 3.3V
0
0
TEMPERATURE ( C)
INPUT VOLTAGE (V)
8
25
25
50
50
10
75
75
L= 1.8 H
L= 10 H
L= 5 H
L= 3 H
12
100
100
1506 G11
1506 G13
1506 G15
125
125
14
0.001
0.01
100
500
450
400
350
300
250
200
150
100
1.0
0.1
40
30
90
80
70
60
50
20
10
50
0
0
0
0
Inductor Core Loss for 3.3V Output
0
Switch Voltage Drop
BOOST Pin Current
DUTY CYCLE = 100%
PERMALLOY
2
1
1
= 125
SWITCH CURRENT (A)
SWITCH CURRENT (A)
TYPE 52
INDUCTANCE ( H)
4
2
2
Metglas
6
3
3
LT1506
125 C
®
25 C
Kool M
– 40 C
4
8
4
1506 G01
1506 G16
®
1506 G14
5
10
5
5