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LTC1709EG-7#PBF

Description
IC REG CTRLR BUCK 36SSOP
CategoryPower/power management    The power supply circuit   
File Size316KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LTC1709EG-7#PBF Overview

IC REG CTRLR BUCK 36SSOP

LTC1709EG-7#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeSSOP
package instructionSSOP,
Contacts36
Manufacturer packaging codeG
Reach Compliance Codecompliant
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 codee3
length12.8 mm
Humidity sensitivity level1
Number of functions1
Number of terminals36
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current3 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height2 mm
surface mountYES
Switch configurationPUSH-PULL
Maximum switching frequency360 kHz
Temperature levelINDUSTRIAL
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature30
width5.3 mm
FEATURES
s
LTC1709-7
2-Phase, 5-Bit VID,
Current Mode, High Efficiency,
Synchronous Step-Down Switching Regulator
DESCRIPTIO
The LTC
®
1709-7 is a 2-phase, VID programmable, synchro-
nous step-down switching regulator controller that drives
two all N-channel external power MOSFET stages in a fixed
frequency 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 regu-
late a secondary winding or select among three modes
including Burst Mode
TM
operation for highest efficiency. An
internal differential amplifier provides true remote sensing
of the regulated supply’s positive and negative output ter-
minals as required in high current applications.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation.
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Output Stages Operate Antiphase Reducing Input
Capacitance Requirements and Power Supply
Induced Noise
Dual Input Supply Capability for Load Sharing
5-Bit Mobile VID Code: V
OUT
= 0.925V to 2V
Current Mode Control Ensures Current Sharing
True Remote Sensing Differential Amplifier
Power Good Output Indicator
OPTI-LOOP
TM
Compensation Minimizes C
OUT
Three Operational Modes: PWM, Burst and Cycle Skip
Programmable Fixed Frequency: 150kHz to 300kHz
±1%
Output Voltage Accuracy
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
Active Voltage Positioning Capable
Available in 36-Lead Narrow SSOP Package
APPLICATIO S
s
s
s
s
Mobile/Desktop Computers
Internet Servers
Large Memory Arrays
DC Power Distribution Systems
TYPICAL APPLICATIO
0.1µF
220pF
I
TH
SGND
PGOOD
5 VID BITS
FCB
+
V
IN
TG1
BOOST1
SW1
S
S
10µF
35V
×4
1µH
RUN/SS
3.3k
0.47µF
LTC1709-7
BG1
PGND
VID0–VID4
EAIN
ATTENOUT
ATTENIN
V
DIFFOUT
V
OS –
V
OS +
SENSE1
+
SENSE1
TG2
BOOST2
SW2
BG2
INTV
CC
SENSE2
+
SENSE2
0.47µF
1µH
0.002Ω
V
OUT
0.925V TO 2V
40A
10µF
+
Figure 1. High Current Dual Phase Step-Down Converter
U
U
U
V
IN
5V TO 28V
0.002Ω
+
C
OUT
1000µF
4V
×2
170989 F01
1

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Description IC REG CTRLR BUCK 36SSOP IC reg ctrlr buck pwm CM 36-ssop IC REG CTRLR BUCK 36SSOP
Brand Name Linear Technology Linear Technology Linear Technology
Is it Rohs certified? conform to incompatible conform to
Maker Linear ( ADI ) Linear ( ADI ) Linear ( ADI )
Parts packaging code SSOP SSOP SSOP
package instruction SSOP, SSOP, SSOP,
Contacts 36 36 36
Manufacturer packaging code G G G
Reach Compliance Code compliant _compli compliant
ECCN code EAR99 EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 36 V 36 V 36 V
Minimum input voltage 4 V 4 V 4 V
Nominal input voltage 15 V 15 V 15 V
JESD-30 code R-PDSO-G36 R-PDSO-G36 R-PDSO-G36
JESD-609 code e3 e0 e3
length 12.8 mm 12.8 mm 12.8 mm
Humidity sensitivity level 1 1 1
Number of functions 1 1 1
Number of terminals 36 36 36
Maximum operating temperature 85 °C 85 °C 85 °C
Minimum operating temperature -40 °C -40 °C -40 °C
Maximum output current 3 A 3 A 3 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SSOP SSOP SSOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius) 260 235 260
Certification status Not Qualified Not Qualified Not Qualified
Maximum seat height 2 mm 2 mm 2 mm
surface mount YES YES YES
Switch configuration PUSH-PULL PUSH-PULL PUSH-PULL
Maximum switching frequency 360 kHz 360 kHz 360 kHz
Temperature level INDUSTRIAL INDUSTRIAL INDUSTRIAL
Terminal surface Matte Tin (Sn) Tin/Lead (Sn/Pb) Matte Tin (Sn)
Terminal form GULL WING GULL WING GULL WING
Terminal pitch 0.65 mm 0.65 mm 0.65 mm
Terminal location DUAL DUAL DUAL
Maximum time at peak reflow temperature 30 20 30
width 5.3 mm 5.3 mm 5.3 mm
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