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LTC3719EG#TR

Description
Switching Regulator LTC3719 - 2-Phase, High Efficiency, Step-Down Controller for AMD Opteron CPUs
CategoryPower/power management    The power supply circuit   
File Size440KB,32 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3719EG#TR Overview

Switching Regulator LTC3719 - 2-Phase, High Efficiency, Step-Down Controller for AMD Opteron CPUs

LTC3719EG#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionSSOP,
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage36 V
Minimum input voltage4 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G36
JESD-609 codee0
length12.8 mm
Humidity sensitivity level1
Number of functions1
Number of terminals36
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current3 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationPHASE-SHIFT
Maximum switching frequency360 kHz
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width5.3 mm
LTC3719
2-Phase, High Efficiency,
Step-Down Controller for
AMD Opteron™ CPUs
FEATURES
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Output Stages Operate Antiphase Reducing Input
and Output Capacitance Requirements and Power
Supply Induced Noise
Dual Input Supply Capability for Load Sharing
5-Bit AMD CPU VID Code:
V
OUT
= 0.8V to 1.55V
±1%
Output Voltage Accuracy
True Remote Sensing Differential Amplifier
Power Good Output Voltage Monitor
Supports Active Voltage Positioning
Current Mode Control Ensures Current Sharing
OPTI-LOOP
®
Compensation Minimizes C
OUT
Three Operational Modes: PWM, Burst and Cycle Skip
Programmable Fixed Frequency: 150kHz to 300kHz
Wide V
IN
Range: 4V to 36V Operation
Adjustable Soft-Start Current Ramping
Internal Current Foldback and Short-Circuit Shutdown
Overvoltage Soft Latch Eliminates Nuisance Trips
Available in 36-Lead Narrow (0.209) SSOP Package
The LTC
®
3719 is a 2-phase, VID programmable, synchro-
nous step-down switching regulator controller that drives
two N-channel external power MOSFET stages in a fixed fre-
quency architecture. The 2-phase controller drives its two
output stages out of phase at frequencies up to 300kHz to
minimize the RMS ripple currents in both input and output
capacitors. The 2-phase technique effectively multiplies the
fundamental frequency by two, improving transient re-
sponse while operating each channel at an optimum fre-
quency for efficiency. Thermal design is also simplified.
An operating mode select pin (FCB) can be used to select
among three modes including Burst Mode
®
operation for
highest efficiency. An internal differential amplifier provides
true remote sensing of the regulated supply’s positive and
negative output terminals as required in high current ap-
plications.
The RUN/SS pin provides soft-start and optional timed,
short-circuit shutdown. Current foldback limits MOSFET
dissipation during short-circuit conditions when the
overcurrent latchoff is disabled. OPTI-LOOP compensation
allows the transient response to be optimized for a wide
range of output capacitors and ESR values.
APPLICATIO S
s
Servers and Workstations
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.
AMD Opteron is a trademark of Advanced Micro Devices, Inc.
TYPICAL APPLICATIO
0.1µF
220pF
FCB
RUN/SS
3.3k
I
TH
SGND
PGOOD
5 VID BITS
V
IN
TG1
BOOST1
SW1
S
10µF
35V
×6
0.47µF
1µH
S
0.002Ω
LTC3719
BG1
PGND
D1
VID0–VID4
EAIN
ATTENOUT
ATTENIN
V
DIFFOUT
V
OS –
V
OS
+
SENSE1
+
SENSE1
TG2
BOOST2
SW2
BG2
SENSE2
+
SENSE2
D2
0.47µF
1µH
0.002Ω
V
DD
_
CORE
0.8V TO 1.55V
45A
Figure 1. High Current Dual Phase Step-Down Converter
sn3719 3719fs
+
INTV
CC
10µF
U
V
IN
5V TO 28V
U
U
+
C
OUT
270µF
2V
×4
3716 F01
1

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LTC3719EG#TR LTC3719EG#TRPBF
Description Switching Regulator LTC3719 - 2-Phase, High Efficiency, Step-Down Controller for AMD Opteron CPUs Switching Regulator Dual Phase Step Down Converter
Is it Rohs certified? incompatible conform to
Maker ADI ADI
package instruction SSOP, SSOP,
Reach Compliance Code not_compliant compliant
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 36 V 36 V
Minimum input voltage 4 V 4 V
Nominal input voltage 15 V 15 V
JESD-30 code R-PDSO-G36 R-PDSO-G36
JESD-609 code e0 e3
length 12.8 mm 12.8 mm
Humidity sensitivity level 1 1
Number of functions 1 1
Number of terminals 36 36
Maximum operating temperature 70 °C 70 °C
Maximum output current 3 A 3 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SSOP SSOP
Package shape RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 235 250
Certification status Not Qualified Not Qualified
Maximum seat height 2 mm 2 mm
surface mount YES YES
Switch configuration PHASE-SHIFT PHASE-SHIFT
Maximum switching frequency 360 kHz 360 kHz
Temperature level COMMERCIAL COMMERCIAL
Terminal surface Tin/Lead (Sn/Pb) Matte Tin (Sn)
Terminal form GULL WING GULL WING
Terminal pitch 0.65 mm 0.65 mm
Terminal location DUAL DUAL
Maximum time at peak reflow temperature 20 NOT SPECIFIED
width 5.3 mm 5.3 mm
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