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LTC1709 Folha de dados(PDF) 1 Page - Linear Technology |
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LTC1709 Folha de dados(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1709 2-Phase, 5-Bit Adjustable, High Efficiency, Synchronous Step-Down Switching Regulator , LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP is a trademark of Linear Technology Corporation. The LTC ®1709 is a 2-phase, VID programmable, synchro- nous step-down switching regulator controller that drives 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 response while operating each channel at a 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 in high current applications. The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipaton during short-circuit conditions when overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values. Figure 1. High Current 2-Phase Step-Down Converter s Desktop Computers s Internet/Network Servers s Large Memory Arrays s DC Power Distribution Systems s Battery Chargers s Two Ouput Stages Operate Antiphase Reducing Input Capacitance and Power Supply Noise s 5-Bit VID Control (VRM 8.4 Compliant) VOUT: 1.3V to 3.5V in 50mV/100mV Steps s Current Mode Control Ensures Current Sharing s True Remote Sensing Differential Amplifier s OPTI-LOOP TM Compensation Minimizes COUT s Programmable Fixed Frequency: 150kHz to 300kHz—Effective 300kHz to 600kHz Switching Frequency s ±1% Output Voltage Accuracy s Wide VIN Range: 4V to 36V Operation s Adjustable Soft-Start Current Ramping s Internal Current Foldback s Short-Circuit Shutdown Timer with Defeat Option s Overvoltage Soft-Latch Eliminates Nuisance Trips s Low Shutdown Current: 20 µA s Small 36-Lead Narrow (0.209") SSOP Package 1709 TA01 TG1 BOOST 1 SW1 BG1 PGND SENSE1+ SENSE1– TG2 BOOST2 SW2 BG2 INTVCC SENSE 2+ SENSE 2– VIN RUN/SS VDIFFOUT ITH SENSEIN FBOUT EAIN VID0–VID4 VOS – VOS + LTC1709 SGND 0.1 µF 1.2nF 5 VID BITS S S S S S S 15k 10 µF ×4 35V + COUT 1000 µF 4V ×2 VOUT 1.3V TO 3.5V 40A 1 µH Q1 Q2 Q3 Q4 0.002 Ω 0.002 Ω VIN 5V TO 28V 1 µH 0.47 µF S 0.47 µF 10 µF Q1–Q4 2 × FAIRCHILD FDS7760A OR SILICONIX Si4874 APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO Efficiency Curve LOAD CURRENTS (A) 0 50 60 80 90 100 10 20 25 45 1709 TA01a 70 515 30 35 40 VIN = 5V VOUT = 1.6V fS = 200kHz |
Nº de peça semelhante - LTC1709_15 |
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Descrição semelhante - LTC1709_15 |
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