2.25MHz, 600mA 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 $2.83
  • High Efficiency: Up to 96%
  • 600mA Output Current at VIN = 3V
  • 2.5V to 5.5V Input Voltage Range
  • 2.25MHz Constant Frequency Operation
  • No Schottky Diode Required
  • Low Dropout Operation: 100% Duty Cycle
  • Low Quiescent Current: 350µA
  • 0.6V Reference Allows Low Output Voltages
  • Shutdown Mode Draws < 1µA Supply Current
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Overtemperature Protected
  • Low Profile (1mm) SOT-23 Package
Additional Details
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The LTC3406B-2 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. Supply current with no load is 350µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3406B-2 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications.

The switching frequency is internally set at 2.25MHz, allowing the use of tiny 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 0.6V feedback reference voltage. The LTC3406B-2 is available in a low profile (1mm) SOT-23 package. Refer to LTC3406 for applications that require Burst Mode® operation.

Vout Fsw Features
LTC3406 Adj. 1.5MHz Burst Mode
LTC3406-1.2 1.2V 1.5MHz Burst Mode
LTC3406-1.5 1.5V 1.5MHz Burst Mode
LTC3406-1.8 1.8V 1.5MHz Burst Mode
LTC3406B Adj. 1.5MHz Burst Mode Disabled
LTC3406B-1.2 1.2V 1.5MHz Burst Mode Disabled
LTC3406B-2 Adj. 2.25MHz Burst Mode Disabled
LTC3406A Adj. 1.5MHz Low Ripple Burst Mode
LTC3406AB Adj. 1.5MHz Burst Mode Disabled
LTC3406AB-2 Adj. 2.25MHz Burst Mode Disabled


  • Cellular Telephones
  • Personal Information Appliances
  • Wireless and DSL Modems
  • Digital Still Cameras
  • MP3 Players
  • Portable Instruments
Part Models 2
1ku List Price Starting From $2.83

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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LTC3406B-2ES5 Demo Board | 2.25MHz, VIN = 2.5V to 5.5V, VOUT = 1.8V @ 600mA (Max)



LTC3406B-2ES5 Demo Board | 2.25MHz, VIN = 2.5V to 5.5V, VOUT = 1.8V @ 600mA (Max)

LTC3406B-2ES5 Demo Board | 2.25MHz, VIN = 2.5V to 5.5V, VOUT = 1.8V @ 600mA (Max)

Product Detail

Demonstration circuit DC702 is a 2.25 MHz step-down converter, using the LTC3406B-2 adjustable output monolithic synchronous buck regulator. The DC702 has an input voltage range of 2.5V to 5.5V, and is capable of delivering up to 600 mA of output current at a minimum input voltage of 3V. the output voltage is set to 1.8V. The DC702 is made for noise sensitive applications, due to the LTC3406B-2 operating in pulse-skipping mode at low load currents.

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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