SC2447 Semtech Corporation, SC2447 Datasheet - Page 11

• Manufacturer Part Number: SC2447
• Description: Dual-Phase Single or Two Output Synchronous Step-Down Controller
• Manufacturer: Semtech Corporation

POWER MANAGEMENT
Block Diagram
2006 Semtech Corp.
COMP2
CS2-
COMP1
CS1+
CS1-
REFOUT
REFIN
CS2+
IN1
REF
IN2
SYNC
ROSC
14
13
11
12
10
1
2
9
6
3
5
4
8
REFSS2
REFSS1
2.5V
50mV
50mV
OSCILLATOR
+
+
-
-
ISEN2
ISEN1
-
+
+
-
+
-
+
+
+
-
EA1
EA2
+
+
-
-
ILIM2+
ILIM1+
0.5V
SLOPE1
+
+
SLOPE2
CLK
Σ
Σ
+
+
SLOPE COMP.
FREQUENCY
DIVIDER
ANALOG
SWITCH
SLOPE2
-
+
-
+
PWM2
PWM1
Figure 3. SC2447 Block Diagram
SEL
CLK2
CLK1
CLK2
OC2
SSL2
CLK1
SSL1
OC1
CLK2
S
SOFT-START
R
S
R
OVERLOAD
CONTROL 2
SOFT-START
OVERLOAD
CONTROL 1
PRE-BIAS
PRE-BIAS
HICCUP
HICCUP
Q
Q
11
&
&
TGON2
TGON1
UV
1.25V
UV
DSBL2
SS2/EN2
OL2
DSBL1
OL1
REFERENCE
SS1/EN1
1.25V
2R
R
0.5V
R
REFSS2
B
2R
Y
A
TRI-STATE1
1.25V
MUX
TRI-STATE2
www.DataSheet4U.com
4.3/4.5V
UVLO
www.semtech.com
SC2447
SS2/EN2
SS1/EN1
GDL1
AGND
GDH2
GDL2
AVCC
GDH1
15
20
16
25
24
28
21
7