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LTC3802 - 典型应用图例：
LTC3802典型应用图例一
LTC3802 - 封装图解：
LTC3802封装图解一
LTC3802封装图解二
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LINEAR产品 - LTC3802介绍

LTC3802 - LTC3802是Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking

LTC3802是LINEAR凌力尔特公司的一款多输出降压产品，LTC3802是LTC3802是Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking，本站介绍了LTC3802的封装应用图解、特点和优点、功能等，并给出了与LTC3802相关的LINEAR元器件型号供参考。

LTC3802 - LTC3802是Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking - 多输出降压 - 电源管理 - 凌力尔特

LTC3802 - Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking

LTC3802 - Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking - Linear Technology（凌力尔特）

功能描述

The LTC3802 is a dual switching regulator controller optimized for high efficiency step-down conversion from input voltages between 3V to 30V. The controller uses a leading edge modulation scheme to allow extremely low duty cycle operation. The constant frequency voltage mode controller allows a phase-lockable frequency between 330kHz and 750kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages 180° out of phase. The synchronous buck architecture automatically shifts to Burst Mode operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

The LTC3802 features an onboard, trimmed 0.6V reference and provides better than 1% regulation at the converter outputs. A separate output sense provides real time overvoltage protection and PGOOD sensing. An FBT pin programs the power-up/-down tracking between the two channels to meet various sequencing requirements. A RUN/SS pin provides soft-start and externally programmable current limit protection functions.

U.S. Patent Nos 5481178, 5846544, 6304066, 6580258, 5055767, 6307356

特点
  • Wide VIN Range: 3V to 30V Operation with Line Feedforward Compensation
  • Leading Edge Modulation Architecture for Extremely Low Duty Cycle Operation
  • Phase-Lockable Fixed Frequency: 330kHz to 750kHz
  • Two 180° Out-of-Phase Controllers
  • Fast Programmable Power-Up/-Down Tracking
  • Programmable Current Limit Without External Current Sense Resistor
  • Optional Burst Mode Operation at Light Load
  • ±1% 0.6V Voltage Reference
  • External N-Channel MOSFET Architecture
  • Low Shutdown Current: <100µA
  • Overvoltage Protection and PGOOD Flag
  • Small 28-Lead SSOP and 32-Lead QFN Packages
    • 应用
  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems
    • 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)
    LTC3802EGN SSOP-28 E $5.71 $4.80
    LTC3802EGN#PBF SSOP-28 E $5.71 $4.80
    LTC3802EGN#TR SSOP-28 E $4.90
    LTC3802EGN#TRPBF SSOP-28 E $4.90
    LTC3802EUH 5x5 QFN-32 E $5.71 $4.80
    LTC3802EUH#PBF 5x5 QFN-32 E $5.71 $4.80
    LTC3802EUH#TR 5x5 QFN-32 E $4.90
    LTC3802EUH#TRPBF 5x5 QFN-32 E $4.90
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  • LT8705 - 80V VIN 和 VOUT 同步、四开关、降压-升压型 DC/DC 控制器
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  • LTC3890 - 60V、低 IQ、双通道、两相、同步降压型 DC/DC 控制器
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  • LTC4359 - 具反向输入保护功能的理想二极管控制器
  • LTC3864 - 具 100% 占空比能力的 60V、低 IQ、降压型 DC/DC 控制器
  • LTC4020 - 55V、降压-升压型多化学组成电池充电器
  • LTC3880 / LTC3880-1 - 具数字电源系统管理功能的双输出多相降压型 DC/DC 控制器
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