LT1578 Linear Technology, LT1578 Datasheet - Page 5

• Manufacturer Part Number: LT1578
• Description: 1.5A/ 200kHz Step-Down Switching Regulator
• Manufacturer: Linear Technology

TYPICAL PERFORMANCE CHARACTERISTICS
Kool M is a registered trademark of Magnetics, Inc.
Metglas is a registered trademark of AlliedSignal, Inc.
240
220
200
180
160
0.8
1.6
1.4
1.2
1.0
0.6
0.4
0.2
–50
0
Switching Frequency
6
Maximum Output Current
at V
–25
OUT
JUNCTION TEMPERATURE ( C)
= 5V
0
INPUT VOLTAGE (V)
9
25
L = 60 H
L = 30 H
L = 15 H
30
25
20
15
10
5
0
0
BOOST Pin Current
50
0.25
12
75
W
SWITCH CURRENT (A)
100
0.50
1576 G13
1578 G15
U
125
0.75
15
1.00
3.0
2.5
2.0
1.5
1.0
0.5
1.4
1.2
0.8
0.6
0.4
1.6
1.0
0.2
0
1.25
0
0
Switch Current Limit Foldback
4
Maximum Output Current
at V
1576 G20
1.50
OUT
0.2
FEEDBACK PIN VOLTAGE (V)
6
= 3.3V
0.4
INPUT VOLTAGE (V)
8
0.6
L = 60 H
L = 30 H
L = 15 H
10
0.8
12
1.0
0.8
0.6
0.4
0.2
1.0
0
–50
V
1578 G19
1578 G16
C
Pin Shutdown Threshold
–25
1.2
14
JUNCTION TEMPERATURE ( C)
0
4.50
4.25
4.00
3.75
3.50
25
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
LT1578/LT1578-2.5
0
1
Minimum Input Voltage to Start
with 3.3V Output
4
Maximum Output Current
at V
50
OUT
6
75
= 2.5V
LOAD CURRENT (mA)
10
INPUT VOLTAGE (V)
100
1576 G21
8
125
L = 60 H
L = 30 H
L = 15 H
10
100
12
1576 G14
1578 G17
5
1000
14