LTC3405A - 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT™

The LTC®3405A is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current during operation is only 20µA and drops to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3405A ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.

Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The LTC3405A is specifically designed to work well with ceramic output capacitors, achieving very low output voltage ripple and a small PCB footprint.

The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.8V feedback reference voltage. The LTC3405A is available in a low profile (1mm) ThinSOT package.

For fixed 1.5V and 1.8V output versions, refer to the LTC3405A-1.5/LTC3405A-1.8 data sheet.

Protected by U.S. Patents, including 6580258, 5481178.

特点
  • High Efficiency: Up to 96%
  • Very Low Quiescent Current: Only 20µA During Operation
  • 300mA Output Current at VIN = 3V
  • 2.5V to 5.5V Input Voltage Range
  • 1.5MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • Stable with Ceramic Capacitors
  • 0.8V Reference Allows Low Output Voltages
  • Shutdown Mode Draws <1µA Supply Current
  • ±2% Output Voltage Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protected
  • Low Profile (1mm) ThinSOT™ Package
典型应用
LTC3405A Typical Application
LTC3405A Typical Application
应用
  • Cellular Telephones
  • Personal Information Appliances
  • Wireless and DSL Modems
  • Digital Still Cameras
  • MP3 Players
  • Portable Instruments
封装信息
LTC3405A Package Drawing
Order Information 订购型号
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) *
LTC3405AES6#PBFSOT-23E$2.37
LTC3405AES6#TRMPBFSOT-23E$2.37$1.69
LTC3405AES6#TRPBFSOT-23E$2.37$1.67
演示电路板
器件型号描述价格
DC480A-ELTC3405AES6 | Thin SOT Synchronous Buck Regulator, 2.5 to 5.5 Vin, ADJ (1.2V) Vout @ 300mA(3.0 Vin min), (Small size Inductor)$75.00
DC480A-FLTC3405AES6 | Thin SOT Synchronous Buck Regulator, 2.5 to 5.5 Vin, ADJ (1.2V) Vout @ 300mA(3.0 Vin min), (High Efficiency Inductor)$75.00
数据表
设计要点
可靠性数据
CAD 符号
LTpowerCAD
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LTC3405A Footprints and Symbols
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