SC4503 Semtech Corporation, SC4503 Datasheet - Page 5

• Manufacturer Part Number: SC4503
• Description: 1.3MHz Step-Up Switching Regulator
• Manufacturer: Semtech Corporation

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 2007 Semtech Corp.
POWER MANAGEMENT
Block Diagram
SHDN/SS
FB
IN
4
5
2
D1
REFERENCE
VOLTAGE
Q1
1.25V
+
-
EA
SHUTDOWN
THERMAL
Figure 2. SC4503 Block Diagram
REF NOT READY
T > 155° ° ° ° C
J
CLK
OSCILLATOR
-
+
PWM
5
SLOPE COMP
S
R
Σ Σ Σ Σ
Q
+
+
ILIM
+
-
Z1
I-LIMIT
Q2
ISEN
1V
+
-
+
-
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SC4503
GND
SW
1
2
Q3
R
SENSE