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PDF SC2453 Data sheet ( Hoja de datos )
| Número de pieza | SC2453 | |
| Descripción | High Performance Quad Output Switching Regulator | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC2453 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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POWER MANAGEMENT
Description
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.
Typical Application Circuit
SC2453
High Performance Quad Output
Switching Regulator
PRELIMINARY
Features
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
Applications
DSL applications with multiple input voltage re-
quirements
Mixed-Signal applications requiring positive and
negative voltages
Cable modem power management
Base station power management
+8-30V
Q1 C29
C30
C29
R28
+3.3V
+2.5V
R31
C32
-12V
R32
C32
C29
R31
C29
16 22
6
AVCC
SS
PVCC
9 OSC
7 SYNC/SHDN
8 POK
28 27
BDI VIN
BST2
GD2H
PH2
GD2L
C32
Q2
R31
Q12 R32
C32 C32
4
R31
5
11
C31
10
BD4 SC2453
FB4
BD3
FB3
AGND PGND
15 21
ILIM2
14
FB2
EO2
BST1
GD1H
PH1
GD1L
FB1
EO1
ILIM1
1
R28 R28
17
18
19
20
13
12
26
25
24
23
2
3
D10 D11
C31
R32 C34
C35
C31
C41
C42 R39
Q11
Q11
Q14
Q15
D11
L8
L9
C30
C33
+3.3V
R30
R33
+1.5V
C38
R35
R38
R32
+3.3V
Revision 5, August 2002
1
www.semtech.com
1 page  
POWER MANAGEMENT
Pin Configuration
Top View
SC2453
Ordering Information
PRELIMINARY
Part Number
SC2453ITSTR
Package
TSSOP-28
Temp. Range (TJ)
-40°C to +85°C
Note:
Only available in tape and reel packaging. A reel
contains 2500 devices.
(28 Pin TSSOP)
Marking Information
TOP
nnnn = Part Number (Example: 1406)
yyww = Date Code (Example: 0012)
xxxxx = Semtech Lot No. (Example: P94A01)
2002 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Evaluation Board Schematic
SC2453
PRELIMINARY
2002 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC2453.PDF ] | |
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