sc4525d Semtech Corporation, sc4525d Datasheet - Page 7

• Manufacturer Part Number: sc4525d
• Description: 18v, 3a, 350khz Step-down Switching Regulator
• Manufacturer: Semtech Corporation

SS270 REV 6-7
SS270 REV 6-7
© 2011 Semtech Corp.
Typical Characteristics
1.02
1.01
1.00
0.99
0.98
0.97
500
450
400
350
300
250
200
150
100
90
85
80
75
70
65
60
55
50
45
40
50
-50
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
0
Feedback Voltage vs Temperature
(8) OCP current
(5) Freq vs Temp
(2) 5Vin Eff
V
-25
Switch Saturation Voltage
0.5
IN
=12V
25
vs Switch Current
Temperature (
Switch Current (A)
o
Load Current (A)
0
C
1
Efficiency
D
25
V
2
IN
=B320A
V
V
V
1.5
=12V
O
O
O
=3.3V
=2.5V
=1.5V
125
50
o
C
2
o
75
C)
-40
2.5
o
SS270 REV 6-7
SS270 REV 6-7
C
100 125
SC4525B
3
1.2
1.1
1.0
0.9
0.8
5.2
4.8
4.4
4.0
3.6
3.2
90
85
80
75
70
65
60
55
50
45
40
Switch Current Limit vs Temperature
-50
-50
(9) BST Pin current
0
(6) Foldback Freq vs Temp
(3) 3.3Vin Eff
-25
-25
Frequency vs Temperature
0.5
Temperature (
Temperature (
0
0
Load Current (A)
1
Efficiency
D
25
25
2
V
V
=B320A
V
V
IN
1.5
O
O
O
=5V
=2.5V
=3.3V
=1.5V
50
50
O
o
2
C)
C)
75
75
SS270 REV 6-7
2.5
SC4525B
100 125
100 125
3
100.0
1.25
0.75
0.25
75.0
50.0
25.0
0.5
90
85
80
75
70
65
60
55
50
45
40
0.0
1
0
0.00
0
BST Pin Current vs Switch Current
0
V
Foldback Frequency vs V
V
0.5
BST
0.5
IN
0.20
=12V
-40
=15V
1
Switch Current (A)
o
Load Current (A)
C
1
www.semtech.com
0.40
1.5
Efficiency
D
V
V
2
IN
FB
V
V
=B320A
1.5
=3.3V
125
O
O
=2V
=1V
2
(V)
SC4525D
0.60
o
C
T
2.5
A
2
=25
o
3
0.80
C
2.5
FB
3.5
1.00
3
4
7