SC4525C View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC4525C' PDF : 21 Pages View PDF
ff
(2) 24Vin Eff
Curve 3
SC4525C
Typical Characteristics
SC4525A
SC4525A
SS270 REV 6-7
Efficiency
90
85
VO=5V
80
V O=3.3V
75
V O=2.5V
70
Efficie ncy
90
85
V O=5V
80
75
V O=3.3V
70
V O=2.5V
Feedback Voltage vs Temperature
1.02
VIN =12V
1.01
1.00
65
V O=1.5V
65
60
60
0.99
55
Curve 5 50
1MHz, VIN=12V
D2 =B320A
45
55
Curve 6 50
1MHz, VIN=24V
D2 =B330A
0.98
45
40
0
SS270 REV 6-7
0.5 1 1.5 2 2.5 3
Load Current (A)
40
0
SS270 REV 6-7
0.97
0.5 1 1.5 2 2.5 3
-50 -25 0 25 50 75 100 125
Load Current (A)
Te mperature (oC)
SS270 REV 6-7
Frequency Setting Resistor
vs Frequency
1000
Frequency vs Temperature
1.2
Foldback Frequency vs VFB
1.25
VIN=12V
100
1.1
ROSC=73.2k
1
ROSC=73.2k
0.75
1.0
10
(8) OCP current
1
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
Frequency (MHz)
0.5
ROSC=12.1k
0.9 (9) BST Pin current 0.25
ROSC=12.1k
TA=25oC
0.8
-50 -25
0 25 50 75 100 125
Temperature (OC)
0
0.00 0.20 0.40 0.60 0.80 1.00
VFB (V)
SS270 REV 6-7
SS270 REV 6-7
Switch Saturation Voltage
vs Switch Current
500
450
400
125oC
350
300
250
25oC
200
-40oC
150
100
50
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Switch Current (A)
Switch Current Limit vs Temperature
5.2
4.8
BST Pin Current vs Switch Current
100.0
VIN =12V
VBST-SW =5V
75.0
4.4
50.0
-40oC
4.0
125oC
25.0
3.6
3.2
-50 -25
0 25 50 75 100 125
Temperature (oC)
0.0
0 0.5 1 1.5 2 2.5 3 3.5 4
Switch Current (A)
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