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LTC3801B - 典型应用图例：
LTC3801B典型应用图例一
LTC3801B典型应用图例二
LTC3801B - 封装图解：
LTC3801B封装图解一
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LINEAR产品 - LTC3801B介绍

LTC3801B - LTC3801B是Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT

LTC3801B是LINEAR凌力尔特公司的一款微功率降压产品，LTC3801B是LTC3801B是Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT，本站介绍了LTC3801B的封装应用图解、特点和优点、功能等，并给出了与LTC3801B相关的LINEAR元器件型号供参考。

LTC3801B - LTC3801B是Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT - 微功率降压 - 电源管理 - 凌力尔特

LTC3801B - Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT

LTC3801 - Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT - Linear Technology（凌力尔特）

功能描述

The LTC3801/LTC3801B are constant frequency current mode step-down DC/DC controllers in a low profile (1mm max) 6-lead SOT-23 (ThinSOT™) package. The parts provide excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. The LTC3801 consumes only 195mA of quiescent current in normal operation, dropping to 16µA under no-load conditions.

The LTC3801/LTC3801B incorporate an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.2V. The LTC3801 automatically switches into Burst Mode operation at light loads which enhances efficiency at low output current. In the LTC3801B, Burst Mode operation is disabled for lower output ripple at light loads.

To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor.

特点
  • High Efficiency: Up to 94%
  • Very Low No-Load Quiescent Current: Only 16µA (LTC3801)
  • High Output Currents Easily Achieved
  • Internal Soft-Start
  • Wide VIN Range: 2.4V to 9.8V
  • Low Dropout: 100% Duty Cycle
  • Constant Frequency 550kHz Operation
  • Burst Mode Operation for High Efficiency at Light Loads (LTC3801)
  • Burst Mode Operation Disabled for Lower Output Ripple at Light Loads (LTC3801B)
  • Output Voltage as Low as 0.8V
  • ±1.5% Voltage Reference Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Only 6µA Supply Current in Shutdown (LTC3801)
  • Low Profile (1mm) SOT-23 Package
    • 应用
  • 1- or 2-Cell Li-Ion Battery-Powered Applications
  • Wireless Devices
  • Portable Computers
  • Distributed Power 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)
    LTC3801BES6 SOT-23 E $3.02
    LTC3801BES6#TR SOT-23 E $3.02 $2.01
    LTC3801BES6#TRM SOT-23 E $3.02 $2.03
    LTC3801BES6#TRMPBF SOT-23 E $3.02 $2.03
    LTC3801BES6#TRPBF SOT-23 E $3.02 $2.01
    LTC3801ES6 SOT-23 E $3.02
    LTC3801ES6#TR SOT-23 E $3.02 $2.01
    LTC3801ES6#TRM SOT-23 E $3.02 $2.03
    LTC3801ES6#TRMPBF SOT-23 E $3.02 $2.03
    LTC3801ES6#TRPBF SOT-23 E $3.02 $2.01
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