SC4520 Semtech Corporation, SC4520 Datasheet - Page 5

• Manufacturer Part Number: SC4520
• Description: 3A Step-Down Switching Regulator
• Manufacturer: Semtech Corporation

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POWER MANAGEMENT
Block Diagram
Typical Characteristic - OCP Limit
2006 Semtech Corp.
SYNC
SYNC
COMP
COMP
FSET
FB
FB
EN
EN
6.5
5.5
4.5
3.5
2.5
7
6
5
4
3
2
0
OSCILLATOR
OSCILLATOR
-
-
EA
EA
1V
1V
20
REFERENCE
REFERENCE
0.7V
0.7V
SC4519H OCP Limit vs Duty Cycle
SLOPE COMP
SLOPE COMP
FREQUENCY
FREQUENCY
+
+
PWM
PWM
UVLO
UVLO
SLOPE
SLOPE
40
Duty Cycle (%)
CLK
CLK
SLOPE
SLOPE
5
+
+
+
+
Rosc = 0
S
S
R
R
60
Q
Q
Is
Is
SOFT START
SOFT START
HICCUP
HICCUP
FB
FB
Is
Is
ISEN
ISEN
80
+
+
OL
OL
POWER
POWER
TRANSISTOR
TRANSISTOR
40m
40m
100
GND
GND
BST
BST
IN
IN
SW
SW
ILIM @-40C
ILIM @25C
ILIM @125C
SC4520
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