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LTC1709-9

Features: Single Controller Operates Two Output Stages:Antiphase Reducing Required Input Capacitanceand Power Supply Induced Noise Two 5-Bit Desktop VID Codes:LTC1709-8 For VRM8.4 (VOUT from 1.3V to 3.5V)LTC1709-9 For VRM9.0 (VOUT from 1.1V to 1.85V) Current Mode Control Ensures Best Current Shar...

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SeekIC No. : 004401835 Detail

LTC1709-9: Features: Single Controller Operates Two Output Stages:Antiphase Reducing Required Input Capacitanceand Power Supply Induced Noise Two 5-Bit Desktop VID Codes:LTC1709-8 For VRM8.4 (VOUT from 1.3V t...

LTC1709-9 Data Sheet

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Part Number:
LTC1709-9
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

Single Controller Operates Two Output Stages:Antiphase Reducing Required Input Capacitanceand Power Supply Induced Noise
Two 5-Bit Desktop VID Codes:LTC1709-8 For VRM8.4 (VOUT from 1.3V to 3.5V)LTC1709-9 For VRM9.0 (VOUT from 1.1V to 1.85V)
Current Mode Control Ensures Best Current Sharing
True Remote Sensing Differential Amplifier
Power Good Output Indicator
OPTI-LOOPTMCompensation Minimizes COUT
Programmable Fixed Frequency: 150kHz to 300kHz
±1% Output Voltage Accuracy
Wide VIN Range: 4V to 36V Operation
Adjustable Soft-Start Current Ramping
Internal Current Foldback and Short-Circuit Shutdown
Overvoltage Soft Latch Eliminates Nuisance Trips
Low Shutdown Current: 20µA
Available in 36-Lead SSOP Package


Application

Workstations
Internet Servers
Large Memory Arrays
DC Power Distribution Systems


Pinout

Connection Diagram


Specifications

Input Supply Voltage (VIN) .........................36V to 0.3V
Topside Driver Voltages (BOOST1,2) .........42V to 0.3V
Switch Voltage (SW1, 2) ..............................36V to 5 V
SENSE1+, SENSE2+, SENSE1,
SENSE2 Voltages ..................... (1.1)INTVCC to 0.3V
EAIN, VOS+, VOS, EXTVCC, INTVCC, RUN/SS,
VBIAS, ATTENIN, ATTENOUT, PGOOD,
VID0VID4, Voltages ................................7V to 0.3V
Boosted Driver Voltage (BOOST-SW) .........7V to 0.3V
PLLFLTR, PLLIN, VDIFFOUT Voltages .. INTVCC to 0.3V
ITH Voltage .............................................2.7V to 0.3V
Peak Output Current <1µs(TGL1,2, BG1,2) .............. 3A
INTVCC RMS Output Current ...............................  50mA
Operating Ambient Temperature Range
  (Note 2) ............................................40°C to 85°C
Junction Temperature (Note 3) .......................... 125°C
Storage Temperature Range .............65°C to 150°C
Lead Temperature (Soldering, 10 sec) ............... 300°C


Description

The LTC®1709-8/LTC1709-9 are 2-phase, VID program-mable, synchronous step-down switching regulator con-trollers that drive two all N-channel external power MOSFETstages in a fixed frequency architecture. The 2-phasecontroller drives its two output stages out of phase atfrequencies up to 300kHz to minimize the RMS ripplecurrents in both input and output capacitors.  The 2-phasetechnique effectively multiplies the fundamental frequencyby two, improving transient response while operatingeach channel at an optimum frequency for efficiency.

Thermal design of LTC1709-8/LTC1709-9 is also simplified.An internal differential amplifier provides true remotesensing of the regulated supply's positive and negativeoutput terminals as required for high current applications.

The RUN/SS pin provides soft-start and optional timed,short-circuit shutdown. Current foldback limits MOSFETdissipation during short-circuit conditions when theovercurrent latchoff is disabled. OPTI-LOOP compensa-tion allows the transient response to be optimized for awide range of output capacitors and ESR values. TheLTC1709-8/LTC1709-9 implement two different VIDtables compliant with VRM8.4 and VRM9.0 respectively.




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