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SC2446AEVB Datasheet(PDF) 8 Page - Semtech Corporation

Part # SC2446AEVB
Description  Dual-Phase, Single or Dual Output Synchronous Step-Down Controller
PDF  27 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2446AEVB Datasheet(HTML) 8 Page - Semtech Corporation

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 2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC2446A
Block Diagram
Figure 3. SC2446A Block Diagram
VIN2
BST1
25
26
27
22
28
16
24
17
20
19
18
21
SYNC
OSCILLATOR
EA1
SLOPE1
+
CLK2
R
Q
S
PWM1
PVCC
23
ROSC
IN1-
CS1+
CS1-
CLK1
-
+
-
+
+
REF
+
-
ISEN1
Σ
AVCC
GDH1
GDL1
PGND
SS1/EN1
COMP1
VPN1
2
4
3
6
1
UV
AGND
7
5
FREQUENCY
DIVIDER
CLK
SLOPE COMP
SLOPE2
GDH2
GDL2
SS2/EN2
VPN2
15
BST2
EA2
SLOPE2
I
+
ILIM2
R
Q
S
PWM2
IN2-
CS2+
CS2-
-
+
-
+
+
+
-
ISEN2
+
-
50mV
Σ
COMP2
13
12
14
UV
11
SEL
CLK2
1.8V
-
+
ANALOG
SWITCH
SEL
A
Y
B
8
REFOUT
REFERENCE
0.5V
1.25V
0.5V
9
50mV
75mV
I
ILIM1+
+
-
I
ILIM1+
+
-
ILIM1-
OCN1
0.5 (REFOUT)
0.5V
+
-
REFIN
10
OL1
Soft-Start
And
Overload
Hiccup
Control 1
DSBL1
75mV
ILIM2-
OCN2
+
-
0.5 (REFIN)
OL2
DSBL2
Soft-Start
And
Overload
Hiccup
Control 2
0.5 (REFIN)
UVLO
4.3/4.5V
+
-
+
-



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