SC4525A Semtech Corporation, SC4525A Datasheet - Page 7

• Manufacturer Part Number: SC4525A
• Description: 28V 3A Step-Down Switching Regulator
• Manufacturer: Semtech Corporation

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SS270 REV 6-7
SS270 REV 6-7
SC4525A
Typical Characteristics
1000
100
500
450
400
350
300
250
200
150
100
90
85
80
75
70
65
60
55
50
45
40
10
50
(5)
1
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
0
0
(8) OCP current
(2) 24Vin Eff
V
Frequency Setting Resistor
IN
Switch Saturation Voltage
0.5
=12V
0.5
vs Switch Current
Frequency (MHz)
Switch Current (A)
vs Frequency
Load Current (A)
1
V
V
V
V
Efficiency
O
O
O
O
=1.5V
=5V
=3.3V
=2.5V
1
V
25
IN
1MHz
125
1.5
=12V
o
C
o
C
1.5
2
2.5
2
SS270 REV 6-7
SS270 REV 6-7
SC4525A
-40
o
C
2.5
3
1.2
1.1
1.0
0.9
0.8
5.0
4.8
4.6
4.4
4.2
4.0
90
85
80
75
70
65
60
55
50
45
40
(6)
Switch Current Limit vs Temperature
-50
-50
(3)
0
(9) BST Pin current
R
R
Frequency vs Temperature
OSC
OSC
-25
-25
0.5
=93.1k
=12.1k
Temperature (
Temperature (
0
0
Load Current (A)
1
Efficiency
25
25
V
IN
1MHz
1.5
=24V
V
V
V
50
50
O
O
O
=5V
=3.3V
=2.5V
o
o
2
C)
C)
75
75
SS270 REV 6-7
2.5
100 125
100 125
3
100.0
1.25
0.75
0.25
75.0
50.0
25.0
1.02
1.01
1.00
0.99
0.98
0.97
0.5
0.0
1
0
0.0
-50
BST Pin Current vs Switch Current
Feedback Voltage vs Temperature
0
R
OSC
Foldback Frequency vs V
R
V
V
0.5
-25
OSC
V
BST-SW
IN
=93.1k
IN
0.2
=12.1k
-40
=12V
=12V
Temperature (
1
Switch Current (A)
o
=5V
0
C
1.5
0.4
V
25
FB
125
2
(V)
SC4525A
50
o
0.6
C
2.5
o
75
C)
T
A
3
0.8
=25
100 125
FB
3.5
o
C
1.0
4
7