LTC3732 3-Phase, 5-Bit VID, 600kHz, Synchronous Buck Switching Regulator Controller

The LTC®3732 is a PolyPhase® synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable fixed frequency architecture. The 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 600kHz per phase to minimize the RMS current losses in both the input and output filter capacitors. The 3- phase technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for high 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 side 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.

LTC and LT are registered trademarks of linear Technology Corporation. Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of linear Technology Corporation. Stage Shedding is a trademark of linear Technology Corporation

产品特点 Features
  • 3-Phase Controller with Onboard MOSFET Drivers
  • ±5% Output Current Matching Optimizes Thermal Performance and Size of Inductors and MOSFETs
  • 4.5V </= VCC </= 7V; 4.5V </= VIN </= 32V
  • Differential Amplifier Accurately Senses VOUT
  • Reduced Input and Output Capacitance
  • Reduced Power Supply Induced Noise
  • VID DAC Programmable from 1.1V to 1.85V (VRM9.0/9.1)
  • ±10% Power Good Output Indicator
  • 250kHz to 600kHz Per Phase, PLL, Fixed Frequency
  • PWM, Stage Shedding™ or Burst Mode® Operation
  • OPTI-LOOP® Compensation Minimizes COUT
  • Adjustable Soft-Start Current Ramping
  • Short-Circuit Shutdown Timer with Defeat Option
  • Overvoltage Soft Latch
  • Small 36-Lead Narrow (0.209 inch) SSOP Package
  • QFN 5mm x 7mm 38-Lead Package
应用
  • Desktop Computers
  • High Performance Notebook Computers
  • High Output Current DC/DC Power Supplies
典型应用图
LTC3732 典型应用
参数
LTC3732 参数
LTC3732 订购信息和价格参考Package Variations and Pricing
器件型号 封装 引脚 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量) *
LTC3732CG SSOP 36 C $5.18  $4.35 
LTC3732CG#PBF SSOP 36 C $5.18  $4.35 
LTC3732CG#TR SSOP 36 C $4.45 
LTC3732CG#TRPBF SSOP 36 C $4.45 
LTC3732CUHF QFN 38 C $5.18  $4.35 
LTC3732CUHF#PBF QFN 38 C $5.18  $4.35 
LTC3732CUHF#TR QFN 38 C $4.45 
LTC3732CUHF#TRPBF QFN 38 C $4.45 
LTC3732 数据手册及相关资料下载
  1. 数据手册(英文) : LTC3732 - 3-Phase, 5-Bit VID, 600kHz, Synchronous Buck Switching Regulator Controller.PDF
  2. 可靠性数据 : R384 Reliability Data .PDF