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LTC3729L-6 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3729L-6 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC3729L-6 sn3729l6 3729l6fs s Desktop Computers s Internet Servers s Large Memory Arrays s DC Power Distribution Systems APPLICATIO S PolyPhase, Synchronous Step-Down Switching Regulator The LTC ®3729L-6 is a PolyPhaseTM synchronous step- down current mode switching regulator controller with a 0.6V reference that drives N-channel external power MOSFET stages in a phase-lockable fixed frequency archi- tecture. The PolyPhase controller drives its two output stages out of phase at frequencies up to 550kHz to minimize the RMS ripple currents in both input and output capacitors. The output clock signal allows expansion for up to 12 evenly phased controllers for systems requiring 15A to 200A of output current. This PolyPhase technique effectively multiplies the fundamental frequency by the number of channels used, 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. A RUN/SS pin provides both 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 over a wide range of output capacitance and ESR values. The LTC3729L-6 includes a power good output pin that indicates when the output voltage is inside the ±10% tolerance window. Figure 1. High Current Dual Phase Step-Down Converter s Reduces Required Input Capacitance and Power Supply Induced Noise s True Remote Sensing Differential Amplifier s 0.6V, ±1% Voltage Reference Accuracy s PolyPhase Controller Operates from Two to Twelve Phases s Current Mode Control Ensures Current Sharing s Phase-Lockable Fixed Frequency: 250kHz to 550kHz s OPTI-LOOP ® Compensation Reduces COUT s Power Good Output Voltage Monitor s Wide VIN Range: 4V to 30V Operation s Very Low Dropout Operation: 99% Duty Cycle s Adjustable Soft-Start Current Ramping s Internal Current Foldback Plus Shutdown Timer s Overvoltage Soft-Latch Eliminates Nuisance Trips s Micropower Shutdown s 32-Lead 5mm × 5mm Plastic QFN Package 3729L-6 TA01 TG1 BOOST1 SW1 BG1 PGND SENSE1+ SENSE1– TG2 BOOST2 SW2 BG2 INTVCC SENSE2+ SENSE2– VIN CLKOUT RUN/SS EAIN ITH VDIFFOUT VOS – VOS + LTC3729L-6 SGND 0.1 µF PGOOD 0.1 µF 10k 3300pF S S S S S S S S 10 Ω 1.5k 60.4k 10 µF ×6 35V CERAMIC + COUT 270 µF ×4 2V L1, L2: CEPH149-IROMC-H COUT: T510E108K004AS D1, D2: SBM540 M1, M3: Si7840DP M2, M4: Si7440DP VOUT 0.7V/40A L1 1 µH 0.002 Ω VIN 5V TO 15V L2 1 µH D2 D1 M1 M2 ×2 M3 M4 ×2 0.47 µF S 0.47 µF 10 µF CER X5R 0.002 Ω FEATURES TYPICAL APPLICATIO DESCRIPTIO , LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP is a registered trademark of Linear Technology Corporation. PolyPhase is a trademark of Linear Technology Corporation. |
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