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LTC3733 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3733 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  1 LTC3733/LTC3733-1 3733f APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO 3-Phase, Buck Controllers for AMD CPUs , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology Corporation. AMD Opteron is a trademark of Advanced Micro Devices, Inc. The LTC ®3733 family are PolyPhase® synchronous step- down switching regulator controllers that drive all N-channel external power MOSFET stages in a phase- lockable, fixed frequency architecture. The 3-phase con- troller drives its output stages with 120 ° phase separation at frequencies of up to 530kHz per phase to minimize the RMS current dissipated by the ESR of both the input and output filter capacitors. The 3-phase technique effectively triples the fundamental frequency, improving transient response while operating each phase at an optimal fre- quency for efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output stage shedding or Burst Mode technology. A differential amplifier provides true remote sensing of both the high and low sides of the output voltage at load points. Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. A foldback current circuit also provides protection for the external MOSFETs under short-circuit or overload conditions. An all-“1” VID detector turns off the regulator after 1 µs timeout. s 3-Phase Controller with Onboard MOSFET Drivers s Current Mode Control Ensures Current Sharing s Differential Amplifier Accurately Senses VOUT s ±5% Output Current Matching Optimizes Thermal Performance and Size of Inductors and MOSFETs s Reduced Input and Output Capacitance s Supports Active Voltage Positioning s VID Programmable Output Voltage from 0.8V to 1.55V (AMD Opteron TM CPU) s 6-Phase, 90A to 120A Operation s Output Power Good Indicator with Adaptive Blanking s 210kHz to 530kHz Per Phase, PLL, Fixed Frequency s Synchronizable (LTC3733-1) s PWM, Stage Shedding or Burst Mode ® Operation s OPTI-LOOP ® Compensation Minimizes COUT s Adjustable Soft-Start Current Ramping s Short-Circuit Shutdown Timer with Defeat Option s No_CPU Detection s 36-Lead 0.209" SSOP and 38-Lead (5mm × 7mm) QFN s High Performance Notebook Computers s Servers, Desktop Computers and Workstations Figure 1. High Current Triple Phase Step-Down Converter 0.002 Ω L1 0.8 µH 22 µF 35V ×2 0.002 Ω L2 0.8 µH VIN D1 D2 D3 0.002 Ω COUT 470 µF 4V ×4 VOUT 0.8V TO 1.55V 65A VIN 5V TO 28V L3 0.8 µH VIN 3733 F01 TG1 VCC 0.1 µF SW3 SW2 SW1 SW1 BG1 SENSE1+ SENSE1– BOOST1 BOOST2 BOOST3 TG2 SW2 BG2 PGOOD RUN PLLFLTR ITH 0.1 µF 100pF 680pF 5 VID BITS 5k ON/OFF POWER GOOD INDICATOR SS SGND EAIN PGND VID0-VID4 SENSE2+ SENSE2– TG3 SW3 BG3 SENSE3+ SENSE3– IN– IN+ PLLIN OPTIONAL SYN IN + 10 µF 5V + LTC3733-1 |
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Similar Description - LTC3733 |
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