LTC3405
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LTC3405

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

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $1.97
Features
  • 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
  • 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
Additional Details
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The LTC3405 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 LTC3405 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 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 LTC3405 is available in a low profile (1mm) ThinSOT package.

For new designs, refer to the LTC3405A data sheet. 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.

Vout Features
LTC3405 Adj. -
LTC3405A Adj. Stable With All Ceramic Caps
LTC3405A-1.375 1.375V Stable With All Ceramic Caps
LTC3405A-1.5 1.5V Stable With All Ceramic Caps
LTC3405A-1.8 1.8V Stable With All Ceramic Caps

Applications

  • Cellular Telephones
  • Personal Information Appliances
  • Wireless and DSL Modems
  • Digital Still Cameras
  • MP3 Players
  • Portable Instruments
Part Models 2
1ku List Price Starting From $1.97

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3405ES6#TRMPBF
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LTC3405ES6#TRPBF
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Software and Part Ecosystem

Software and Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC422A-B

LTC3405ES6 | Highest Efficiency, SOT-23 Synchronous Buck Regulator (high efficiency inductor), 2.7~6VIN, 1.8VOUT @ 300mA

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DC422A-B

LTC3405ES6 | Highest Efficiency, SOT-23 Synchronous Buck Regulator (high efficiency inductor), 2.7~6VIN, 1.8VOUT @ 300mA

LTC3405ES6 | Highest Efficiency, SOT-23 Synchronous Buck Regulator (high efficiency inductor), 2.7~6VIN, 1.8VOUT @ 300mA

Product Detail

DC422A-B: Demo Board for the LTC3405 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT


 


reference details image

DC422A-A

LTC3405ES6 | High Efficiency, SOT-23 Synchronous Buck Regulator (smallest solution footprint & inductor), 2.7~6VIN, 1.8VOUT @ 300mA

zoom

DC422A-A

LTC3405ES6 | High Efficiency, SOT-23 Synchronous Buck Regulator (smallest solution footprint & inductor), 2.7~6VIN, 1.8VOUT @ 300mA

LTC3405ES6 | High Efficiency, SOT-23 Synchronous Buck Regulator (smallest solution footprint & inductor), 2.7~6VIN, 1.8VOUT @ 300mA

Product Detail

DC422A-A: Demo Board for the LTC3405 1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT


 


Tools & Simulations

Tools & Simulations 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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