LTC3406B-2

PRODUCTION

2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

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Overview

  • 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

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

Applications

  • Cellular Telephones
  • Personal Information Appliances
  • Wireless and DSL Modems
  • Digital Still Cameras
  • MP3 Players
  • Portable Instruments
LTC3406B-2
2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
High Efficiency Step-Down Converter Efficiency vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LTC3406AB-2
PRODUCTION 2.25MHz, 600mA Synchronous Step-Down Regulator in ThinSOT
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3406
  • LTC3406-1.2
  • LTC3406-1.5
  • LTC3406-1.8
  • LTC3406A
  • LTC3406AB
  • LTC3406B
  • LTC3406B-1.2
  • LTC3406B-1.5
  • LTC3406B-1.8
  • LTC3406B-2

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3406
  • LTC3406-1.2
  • LTC3406-1.5
  • LTC3406-1.8
  • LTC3406B
  • LTC3406B-2
LTspice

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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC702A

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

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Product Details

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.
DC702A
LTC3406B-2ES5 Demo Board | 2.25MHz, VIN = 2.5V to 5.5V, VOUT = 1.8V @ 600mA (Max)
DC702A - Schematic

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