LTC3406B-2

PRODUCTION

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

Part Models: 2
1ku List Price: Starting From $2.83

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Part Details

High Efficiency: Up to 96%
600mA Output Current at V_IN = 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

Part Models: 2
1ku List Price: Starting From $2.83

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3406B-2ES5#TRMPBF	5-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3406B-2ES5#TRPBF	5-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

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

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

LTC3406B-2 Project - 1.5MHz, 600mA Synchronous Monolithic Buck Regulator (2.5-5.5V to 1.8V @ 600mA)

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^® 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

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.

Resources

DC702A - Schematic
9/24/2009

DC702A - Demo Manual
9/24/2009

DC702A - Design File
9/24/2009

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