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LTC1553CG

Description
5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor
CategoryPower/power management    The power supply circuit   
File Size305KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC1553CG Overview

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor

LTC1553CG Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP20,.3
Contacts20
Manufacturer packaging codeG
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage8 V
Minimum input voltage4.5 V
Nominal input voltage5 V
JESD-30 codeR-PDSO-G20
JESD-609 codee0
length7.2 mm
Humidity sensitivity level1
Number of functions1
Number of terminals20
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current19 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP20,.3
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.99 mm
Maximum supply current (Isup)1.2 mA
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency350 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width5.29 mm
Base Number Matches1
LTC1553
5-Bit Programmable
Synchronous Switching
Regulator Controller for
Pentium
®
II Processor
FEATURES
s
s
DESCRIPTION
The LTC
®
1553 is a high power, high efficiency switching
regulator controller optimized for 5V or 12V input to 1.8V-
3.5V output applications. It features a digitally programmable
output voltage, a precision internal reference and an internal
feedback system that provides output accuracy of
±1.5%
at
room temperature and typically
±2%
over-temperature, load
current and line voltage shifts. The LTC1553 uses a synchro-
nous switching architecture with two external N-channel
output devices, providing high efficiency and eliminating the
need for a high power, high cost P-channel device. Addition-
ally, it senses the output current across the on-resistance of
the upper N-channel FET, providing an adjustable current
limit without an external low value sense resistor.
The LTC1553 free-runs at 300kHz and can be synchronized
to a faster external clock if desired. It includes all the inputs
and outputs required to implement a power supply conform-
ing to the
Intel Pentium
®
II Processor VRM 8.2 DC/DC
Converter Specification.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
s
s
s
s
s
s
s
s
s
5-Bit Digitally Programmable 1.8V to 3.5V Fixed
Output Voltage
Provides All Features Required by the
Intel
Pentium
®
II Processor VRM 8.2 DC/DC
Converter Specification
Flags for Power Good, Over-Temperature and
Overvoltage Fault
19A Output Current Capability from a 5V or 12V Supply
Dual N-Channel MOSFET Synchronous Driver
Initial Output Accuracy:
±1.5%
Excellent Output Accuracy:
±2%
Typ Over Line,
Load and Temperature Variations
High Efficiency: Over 95% Possible
Adjustable Current Limit Without External Sense
Resistors
Fast Transient Response
Available in 20-Lead SSOP and SW Packages
APPLICATIONS
s
s
Power Supply for Pentium II, SPARC, ALPHA and
PA-RISC Microprocessors
High Power 5V or 12V to 1.8V-3.5V Regulators
TYPICAL APPLICATION
+
0.1µF
5.6k
5.6k
5.6k
V
CC
I
MAX
10µF
2.7k
PV
CC
12V
V
IN
5V
+
0.1µF
10µF
PWRGD
PENTIUM II
SYSTEM
®
PV
CC
G1
20Ω
Q1*
L
O
2µH
18A
C
OUT
††
330µF
×
7
V
OUT
1.8V TO
3.5V
14A
FAULT
5
OT
VID0 TO VID4
OUTEN
COMP
C1
150pF
R
C
8.2k
C
C
0.01µF
SS
SGND
GND
SENSE
LTC1553
I
FB
G2
Q2*
C
SS
0.1µF
0.1µF
*SILICONIX SUD50N03-10
**SANYO 10MV1200GX
COILTRONICS CTX02-13198 OR
PANASONIC 12TS-2R5SP
††
AVX TPSE337M006R0100
Figure 1. 5V to 1.8V-3.5V Supply Application
U
U
U
+
C
IN
**
1200µF
×
4
+
1553 F01
1

LTC1553CG Related Products

LTC1553CG LTC1553CSW LTC1553
Description 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor
Brand Name Linear Technology Linear Technology -
Is it Rohs certified? incompatible incompatible -
Maker Linear ( ADI ) Linear ( ADI ) -
Parts packaging code SSOP SOIC -
package instruction SSOP, SSOP20,.3 SOP, SOP20,.4 -
Contacts 20 20 -
Manufacturer packaging code G SW -
Reach Compliance Code not_compliant not_compliant -
ECCN code EAR99 EAR99 -
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER -
control mode VOLTAGE-MODE VOLTAGE-MODE -
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION -
Maximum input voltage 8 V 8 V -
Minimum input voltage 4.5 V 4.5 V -
Nominal input voltage 5 V 5 V -
JESD-30 code R-PDSO-G20 R-PDSO-G20 -
JESD-609 code e0 e0 -
length 7.2 mm 12.8015 mm -
Humidity sensitivity level 1 1 -
Number of functions 1 1 -
Number of terminals 20 20 -
Maximum operating temperature 70 °C 70 °C -
Maximum output current 19 A 19 A -
Package body material PLASTIC/EPOXY PLASTIC/EPOXY -
encapsulated code SSOP SOP -
Encapsulate equivalent code SSOP20,.3 SOP20,.4 -
Package shape RECTANGULAR RECTANGULAR -
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE -
Peak Reflow Temperature (Celsius) 235 235 -
Certification status Not Qualified Not Qualified -
Maximum seat height 1.99 mm 2.642 mm -
Maximum supply current (Isup) 1.2 mA 1.2 mA -
surface mount YES YES -
Switch configuration PUSH-PULL PUSH-PULL -
Maximum switching frequency 350 kHz 350 kHz -
technology CMOS CMOS -
Temperature level COMMERCIAL COMMERCIAL -
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) -
Terminal form GULL WING GULL WING -
Terminal pitch 0.65 mm 1.27 mm -
Terminal location DUAL DUAL -
Maximum time at peak reflow temperature 20 20 -
width 5.29 mm 7.493 mm -
Base Number Matches 1 1 -
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