sc4524d Semtech Corporation, sc4524d Datasheet - Page 7

• Manufacturer Part Number: sc4524d
• Description: 18v 2a Step-down Switching Regulator
• Manufacturer: Semtech Corporation

SC4524A/B
Typical Characteristics
1000
100
300
250
200
150
100
10
Curve 8
50
90
85
80
75
70
65
60
55
50
45
40
Curve 5
1
0.0
0
0
(2)
Frequency Setting Resistor
0.25 0.5 0.75 1
Switch Saturation Voltage
V
0.5
IN
0.5
=12V
vs Switch Current
Frequency (MHz)
Switch Current (A)
vs Frequency
Load Current (A)
1MHz, V
25
Efficiency
D
1.0
2
o
=20BQ030
C
1
IN
V
V
V
V
125
=12V
1.5
O
O
O
O
1.25 1.5 1.75 2
=5V
=3.3V
=2.5V
=1.5V
o
C
1.5
2.0
-40
SS270 REV 6-7
SS270 REV 6-7
SC4524A/B
o
C
2.5
2
4.5
4.0
3.5
3.0
2.5
1.2
1.1
1.0
0.9
0.8
Curve 9
90
85
80
75
70
65
60
55
50
45
40
Curve 6
-50
Switch Current Limit vs Temperature
-50
Curve 3
0
R
R
-25
-25
OSC
OSC
Frequency vs Temperature
=73.2k
=12.1k
0.5
Temperature (
0
V
Temperature (
0
Load Current (A)
O
=3.3V
D
Efficiency
1MHz, V
2
25
25
=20BQ030
1
V
50
V
IN
50
O
O
=5V
=1.5V
=2.5V
O
O
C)
75
C)
75
1.5
SS270 REV 6-7
SS270 REV 6-7
SS270 REV 6-7
V
100 125
O
100 125
=1.0V
2
100.0
1.02
1.01
1.00
0.99
0.98
0.97
1.25
0.75
0.25
75.0
50.0
25.0
0.5
0.0
1
0
0.00
-50
BST Pin Current vs Switch Current
Feedback Voltage vs Temperature
0
R
OSC
V
V
Foldback Frequency vs V
V
-25
R
IN
BST
IN
0.5
OSC
0.20
=73.2k
=12V
=12V
=15V
=12.1k
Temperature (
Switch Current (A)
0
-40
1
0.40
o
C
25
V
FB
1.5
(V)
50
0.60
T
125
A
=25
2
o
75
C)
o
C
o
0.80
C
2.5
100 125
FB
1.00
3
7