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LTC1929 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1929 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1929/LTC1929-PG 2-Phase, High Efficiency, Synchronous Step-Down Switching Regulators , LTC and LT are registered trademarks of Linear Technology Corporation. OPTI-LOOP is a trademark of Linear Technology Corporation. The LTC ®1929/LTC1929-PG are 2-phase, single output, synchronous step-down current mode switching regula- tor controllers that drive N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 2-phase controllers drive their 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 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 by high current applications. The RUN/SS pin provides soft-start and a defeatable, timed, latched short-circuit shutdown to shut down both channels. Internal foldback current limit provides protec- tion for the external synchronous MOSFETs in the event of an output fault. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance 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 2-Phase Single Output Controller s Reduces Required Input Capacitance and Power Supply Induced Noise s Current Mode Control Ensures Current Sharing s Phase-Lockable Fixed Frequency: 150kHz to 300kHz s True Remote Sensing Differential Amplifier s OPTI-LOOP TM Compensation Improves Transient Response s ±1% Output Voltage Accuracy s Power Good Output Voltage Monitor (LTC1929-PG) s Wide VIN Range: 4V to 36V Operation s Very Low Dropout Operation: 99% Duty Cycle 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 Available in 28-Lead SSOP Package FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO 1929 F01 TG1 BOOST1 SW1 BG1 PGND SENSE1+ SENSE1– TG2 BOOST2 SW2 BG2 INTVCC SENSE2+ SENSE2– VIN RUN/SS EAIN ITH VDIFFOUT VOS – VOS + LTC1929 SGND 0.1 µF 0.1 µF 16k 1000pF 10 Ω 10k 16k 10 µF 35V CERAMIC ×4 + COUT 1000 µF 4V ×2 VOUT 1.6V/40A L1 1 µH 0.002 Ω VIN 5V TO 28V L2 1 µH D2 D1 0.47 µF 0.47 µF 100pF 10 µF 0.002 Ω COUT: T510E108K004AS L1, L2: CEPH149-1ROMC |
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