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SC2453 Datasheet(PDF) 1 Page - Semtech Corporation

Part No. SC2453
Description  High Performance Quad Output Switching Regulator
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SC2453 Datasheet(HTML) 1 Page - Semtech Corporation

 
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www.semtech.com
SC2453
High Performance Quad Output
Switching Regulator
POWER MANAGEMENT
PRELIMINARY
Revision 5, August 2002
Description
Features
Applications
Typical Application Circuit
Two synchronized converters for low noise
Power up sequencing to prevent latch-ups
Out of phase operation for low input ripple
Over current protection
Wide input range, 4.5 to 30V
Programmable frequency up to 700KHz
Two synchronous bucks for high efficiency at high
current
One dedicated programmable positive linear
regulator and one dedicated programmable nega-
tive linear regulator
–40 to 105 degree C operating temperature
Output voltage as low as 0.5V
Small package TSSOP-28
SC2453 is a high performance multi-output converter
controller that can be configured for a variety of applica-
tions. The SC2453 utilizes synchronous rectified buck
topologies where efficiency is most important. It also
provides dedicated programmable positive and negative
linear regulators using external transistors in conjunction
with coupled windings to generate positive and negative
voltages. Power up sequencing prevents converter latch-
ups.
The two buck converters are out of phase, reducing in-
put ripple, allowing for fewer input capacitors. All con-
verters are synchronized to prevent beat frequencies.
High frequency operation will reduce ripple and minimize
noise. It also reduces the size of output inductors and
capacitors. Other features include soft start, power-good
signaling, bootstrapping for high side MOSFETs, and fre-
quency synchronization.
DSL applications with multiple input voltage re-
quirements
Mixed-Signal applications requiring positive and
negative voltages
Cable modem power management
Base station power management
R38
C29
C41
C30
Q11
Q1
D11
R28
C31
C31
R31
+8-30V
R33
SC2453
23
24
25
12
26
8
7
15
3
20
2
4
13
19
18
17
5
28
14
27
21
1
11
10
22
16
6
9
GD1L
PH1
GD1H
EO2
BST1
POK
SYNC/SHDN
AGND
EO1
GD2L
FB1
BD4
FB2
PH2
GD2H
BST2
FB4
BDI
ILIM2
VIN
PGND
ILIM1
BD3
FB3
PVCC
AVCC
SS
OSC
Q15
Q12
C29
C32
R28
C31
+3.3V
Q14
Q11
C32
R28
C30
R32
R31
R31
C32
C33
+3.3V
C32
R31
-12V
R32
R39
D11
R30
+3.3V
C29
C38
L8
R32
C34
R32
C32
R35
D10
+1.5V
Q2
+2.5V
C29
L9
C35
C42


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