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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LTC1709-8 데이터시트(PDF) 1 Page - Linear Technology |
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LTC1709-8 데이터시트(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1709-8/LTC1709-9 FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP is a trademark of Linear Technology Corporation. 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 MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies from 150kHz 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 response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified. An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required for 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 compensa- tion allows the transient response to be optimized for a wide range of output capacitors and ESR values. The LTC1709-8/LTC1709-9 implement two different VID tables compliant with VRM8.4 and VRM9.0 respectively. Figure 1. High Current 2-Phase Step-Down Converter s Workstations s Internet Servers s Large Memory Arrays s DC Power Distribution Systems s Single Controller Operates Two Output Stages Antiphase Reducing Required Input Capacitance and Power Supply Induced Noise s 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) s Current Mode Control Ensures Best Current Sharing s True Remote Sensing Differential Amplifier s Power Good Output Indicator s OPTI-LOOP TM Compensation Minimizes COUT s Programmable Fixed Frequency: 150kHz to 300kHz s ±1% Output Voltage Accuracy s Wide VIN Range: 4V to 36V Operation s Adjustable Soft-Start Current Ramping s Internal Current Foldback and Short-Circuit Shutdown s Overvoltage Soft Latch Eliminates Nuisance Trips s Low Shutdown Current: 20 µA s Available in 36-Lead Narrow SSOP Package 17097 F01 TG1 BOOST1 SW1 BG1 PGND SENSE1+ SENSE1– TG2 BOOST2 SW2 BG2 INTVCC SENSE2+ SENSE2– VIN RUN/SS VDIFFOUT ITH ATTENIN ATTENOUT EAIN VID0–VID4 VOS – VOS + LTC1709-8 SGND PGOOD 0.1 µF 220pF 5 VID BITS S S 3.3k 10 µF 35V ×4 + + COUT 1000 µF 4V ×2 VOUT 1.3V TO 3.5V 40A 1 µH 0.002 Ω 0.002 Ω VIN 5V TO 28V 1 µH 0.47 µF 0.47 µF 10 µF 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators |
유사한 부품 번호 - LTC1709-8_1 |
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유사한 설명 - LTC1709-8_1 |
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