SC4518H Semtech Corporation, SC4518H Datasheet - Page 6

• Manufacturer Part Number: SC4518H
• Description: 2A Step-Down Switching Regulator
• Manufacturer: Semtech Corporation

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POWER MANAGEMENT
Block Diagram
Typical Characteristic - OCP Limit
2007 Semtech Corp.
4.5
3.5
2.5
1.5
0.5
SYNC
SYNC
4
3
2
1
COMP
COMP
0
FB
FB
EN
EN
OSCILLATOR
OSCILLATOR
-
-
20
EA
EA
1V
1V
SC4518H OCP Limit vs Duty Cycle
REFERENCE
REFERENCE
0.7V
0.7V
40
SLOPE COMP
SLOPE COMP
Duty Cycle (%)
FREQUENCY
FREQUENCY
+
+
PWM
PWM
UVLO
UVLO
SLOPE
SLOPE
CLK
CLK
SLOPE
SLOPE
60
6
+
+
+
+
S
S
R
R
Q
Q
Is
Is
SOFT START
SOFT START
HICCUP
HICCUP
FB
FB
Is
Is
80
ISEN
ISEN
+
+
OL
OL
100
POWER
POWER
TRANSISTOR
TRANSISTOR
40m
40m
GND
GND
BST
BST
IN
IN
SW
SW
ILIM @ -40C
ILIM @ 25C
ILIM @ 125C
SC4518H
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