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LTC3718封装图解
LTC3718封装图解一
LTC3718是Low Input Voltage, DC/DC Controller for DDR/QDR Memory Termination

LTC3718 - Low Input Voltage, DC/DC Controller for DDR/QDR Memory Termination

LTC3718 - Low Input Voltage, DC/DC Controller for DDR/QDR Memory Termination - Linear Technology(凌力尔特)

功能描述

The LTC3718 is a high current, high efficiency synchronous switching regulator controller for DDR and QDR™ memory termination. It operates from an input as low as 1.5V and provides a regulated output voltage equal to (0.5)VIN. The controller uses a valley current control architecture to enable high frequency operation with very low on-times without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT. The LTC3718 uses a pair of standard 5V logic level N-channel external MOSFETs, eliminating the need for expensive P-channel or low threshold devices.

Forced continuous operation reduces noise and RF interference. Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit timer. Soft-start capability for supply sequencing can be accomplished using an external timing capacitor. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

OPTI-LOOP is a registered trademark of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. QDR RAMs and Quad Data Rate RAMs comprise a new family of products developed by Cypress Semiconductor, IDT and Micron Technology, Inc.

特点
  • Very Low VIN(MIN): 1.5V
  • Ultrafast Transient Response
  • True Current Mode Control
  • 5V Drive for N-Channel MOSFETs Eliminates Auxillary 5V Supply
  • No Sense Resistor Required
  • Uses Standard 5V Logic-Level N-Channel MOSFETs
  • VOUT(MIN): 0.4V
  • VOUT Tracks 1/2 VIN or External VREF
  • Symmetrical Source and Sink Output Current Limit
  • Adjustable Switching Frequency
  • tON(MIN) <100ns
  • Power Good Output Voltage Monitor
  • Programmable Soft-Start
  • Output Overvoltage Protection
  • Optional Short-Circuit Shutdown Timer
  • Small 24-Lead SSOP Package
  • 应用
  • Bus Termination: DDR/QDR Memory, SSTL, HSTL,...
  • Servers, RAID Systems
  • Distributed Power Systems
  • Synchronous Buck with General Purpose Boost
  • 以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格(美元)
    器件型号 封装 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量)
    LTC3718EG SSOP-24 E $4.91 $3.45
    LTC3718EG#PBF SSOP-24 E $4.91 $3.45
    LTC3718EG#TR SSOP-24 E $3.55
    LTC3718EG#TRPBF SSOP-24 E $3.55
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