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LTC3819EG#PBF

Description
IC CNTRLR STEP DOWN 36-SSOP
CategoryPower/power management    The power supply circuit   
File Size363KB,32 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric Compare View All

LTC3819EG#PBF Overview

IC CNTRLR STEP DOWN 36-SSOP

LTC3819EG#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP, SSOP36,.3
Contacts36
Manufacturer packaging codeG
Reach Compliance Codecompliant
ECCN codeEAR99
Is SamacsysN
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 codee3
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
Encapsulate equivalent codeSSOP36,.3
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationPHASE-SHIFT
Maximum switching frequency360 kHz
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
width5.3 mm
Base Number Matches1
LTC3819
2-Phase, High Efficiency,
Step-Down Controller for
Sun Server CPUs
FEATURES
DESCRIPTIO
Output Stages Operate Antiphase Reducing Input
and Output Capacitance Requirements and Power
Supply Induced Noise
Dual Input Supply Capability for Load Sharing
5-Bit SUN CPU VID Code:
V
OUT
= 1.025V to 1.4125V
±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
®
3819 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
Sun™ Server CPU Supply
, LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP
and Burst Mode are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6304066, 5705919.
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
LTC3819
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
1.025V TO 1.4125V
45A
Figure 1. High Current Dual Phase Step-Down Converter
3819f
+
INTV
CC
10µF
U
V
IN
5V TO 28V
U
U
+
C
OUT
270µF
2V
×4
3716 F01
1

LTC3819EG#PBF Related Products

LTC3819EG#PBF LTC3819EG#TRPBF
Description IC CNTRLR STEP DOWN 36-SSOP IC CNTRLR STEP DOWN 36-SSOP
Brand Name Linear Technology Linear Technology
Is it Rohs certified? conform to conform to
Maker Linear ( ADI ) Linear ( ADI )
Parts packaging code SSOP SSOP
package instruction SSOP, SSOP36,.3 SSOP, SSOP36,.3
Contacts 36 36
Manufacturer packaging code G G
Reach Compliance Code compliant compliant
ECCN code EAR99 EAR99
Is Samacsys N N
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 e3 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
Encapsulate equivalent code SSOP36,.3 SSOP36,.3
Package shape RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 260 260
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
technology CMOS CMOS
Temperature level COMMERCIAL COMMERCIAL
Terminal surface Matte Tin (Sn) 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 40 40
width 5.3 mm 5.3 mm
Base Number Matches 1 1
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