sc4524a Semtech Corporation, sc4524a Datasheet - Page 7

• Manufacturer Part Number: sc4524a
• Description: Sc4524a 28v 2a Step-down Switching Regulator
• Manufacturer: Semtech Corporation

SC4524A/B
Typical Characteristics
1000
100
300
250
200
150
100
10
90
85
80
75
70
65
60
55
50
45
40
(8)
50
(5)
1
0.0
0
0
V
Frequency Setting Resistor
-40
IN
Switch Saturation Voltage
o
=12V
0.5
0.5
C
24Vin Eff.
0.5
vs Switch Current
Frequency (MHz)
Switch Current (A)
vs Frequency
Load Current (A)
1MHz, V
Efficiency
D
1.0
25
2
1
=20BQ030
o
C
1
IN
V
V
V
V
125
=12V
1.5
1.5
O
O
O
O
=5V
=3.3V
=2.5V
=1.5V
o
C
1.5
2.0
2
SS270 REV 6-7
SS270 REV 6-7
SC4524A
2.5
2.5
2
1.2
1.1
1.0
0.9
0.8
4.5
4.0
3.5
3.0
2.5
(9)
90
85
80
75
70
65
60
55
50
45
40
(6)
Switch Current Limit vs Temperature
-50
-50
(3)
0
R
R
Frequency vs Temperature
OSC
OSC
-25
-25
=93.1k
=12.1k
0.5
Temperature (
Temperature (
0
0
Load Current (A)
1MHz, V
Efficiency
D
2
25
25
=20BQ030
1
IN
V
V
V
50
50
=24V
O
O
O
=5V
=3.3V
=2.5V
o
o
C)
C)
75
75
1.5
SS270 REV 6-7
SS270 REV 6-7
100 125
100 125
2
100.0
1.25
0.75
0.25
1.02
1.01
1.00
0.99
0.98
0.97
75.0
50.0
25.0
0.5
0.0
1
0
0.0
-50
Feedback Voltage vs Temperature
BST Pin Current vs Switch Current
0
R
OSC
Foldback Frequency vs V
R
V
V
V
-25
OSC
IN
BST
IN
0.5
=93.1k
0.2
=12V
=12.1k
=12V
=15V
Temperature (
Switch Current (A)
0
-40
1
o
0.4
C
25
V
FB
1.5
(V)
50
0.6
125
2
o
75
C)
T
o
C
A
0.8
=25
2.5
100 125
FB
o
C
1.0
3
7