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SC2453ITSTRT

Description
Switching Voltage Regulators HG PRO FLEX CNTLR MLT-O/PUT PS
CategoryPower/power management    The power supply circuit   
File Size414KB,22 Pages
ManufacturerSEMTECH
Websitehttp://www.semtech.com
Environmental Compliance
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SC2453ITSTRT Overview

Switching Voltage Regulators HG PRO FLEX CNTLR MLT-O/PUT PS

SC2453ITSTRT Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerSEMTECH
Parts packaging codeTSSOP
package instructionTSSOP, TSSOP28,.25
Contacts28
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesDUAL SWITCHING CONTROLLER
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage4.5 V
Nominal input voltage5 V
JESD-30 codeR-PDSO-G28
JESD-609 codee3
length9.7 mm
Humidity sensitivity level1
Number of functions1
Number of terminals28
Maximum operating temperature105 °C
Minimum operating temperature-35 °C
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Encapsulate equivalent codeTSSOP28,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.2 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency700 kHz
Temperature levelOTHER
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width4.4 mm
High Performance Quad Output
Switching Regulator
POWER MANAGEMENT
Description
The SC2453 is a high performance controller for multi-
output converters that can be configured for a wide vari-
ety of applications. The SC2453 utilizes PWM synchro-
nous buck topologies where efficiency is most important.
It also provides dedicated programmable positive and
negative linear regulators using external transistors. Each
of the three positive outputs is adjustable down to 0.5V.
The two PWM switchers are synchronized 180° out of
phase reducing input ripple, allowing for fewer input ca-
pacitors. Power up sequencing prevents converter latch-
up.
The SC2453 can be synchronized to other converters to
prevent beat frequencies. The wide range programmable
operating frequency allows users to optimize a converter
design. The PWM switchers sense the voltage across the
low-side MOSFETs on-resistance to efficiently provide
adjustable current-limit, eliminating costly current-sense
resistors. A POK signal is issued when soft-start is com-
plete on both PWM switchers and their outputs are within
10% of the set point.
SC2453
Features
Two synchronized converters for low noise
Power up sequencing to prevent latch-up
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
negative linear regulator
Output voltage as low as 0.5V
Small package TSSOP-28. Also offered in lead free,
WEEE and RoHS compliant package
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
Typical Application Circuit
Vin: 4.5 - 30V
Q1
R1
C2
C1
C3
R3
C4
16
22
28
27
D1
D2
D3
C5
L1
A VCC
6
9
P VCC
V IN
B DI
C6
SS/SHDN
OSC
S Y NC
POK
BS T2
GD2H
PH2
GD2L
FB2
17
18
19
20
13
12
26
25
24
23
2
3
C19
C20
C13
R8
C12
C7
Q2
Vout2: +3.3V
C8
R5
R4
7
8
To Vout2
C10
C9
Q3
(as low as 0.5V)
R6
C11
Vout4: +2.5V
R9
C14
Q4
R7
4
BD4
SC 2453
EO2
BS T1
5
R10
11
Q5
FB4
GD1H
PH1
L2
Vout1: +5V
C15
R12
Q6
BD3
A GND
P GND
GD1L
FB1
ILI M2
(as low as 0.5V)
Vout3: -12V
R14
Q7
R11
C16
FB3
ILI M1
10
EO1
C17
C18
15
21
14
R15
R13
R16
1
R17
R18
To Vout2
Revision: July 20, 2005
1
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