LT3493

PRODUCTION

1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN

Part Models: 4
1ku List Price: Starting From $3.21

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Part Details

Wide Input Range: 3.6V to 36V Operating, 40V Maximum
1.2A Output Current
Fixed Frequency Operation: 750kHz
Output Adjustable Down to 780mV
Short-Circuit Robust
Uses Tiny Capacitors and Inductors
Soft-Start
Internally Compensated
Low Shutdown Current: <2μA
Low V_CESAT Switch: 330mV at 1A
Thermally Enhanced, Low Profile DFN Package

The LT3493 is a current mode PWM step-down DC/DC converter with an internal 1.75A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3493 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The low current (<2µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems.


	V_IN Range
LT3493	3.6V to 36V Operating, 40V Maximum
LT3493-3	6.8V to 36V Operating, 40V Maximum

Applications

Automotive Battery Regulation
Industrial Control Supplies
Wall Transformer Regulation
Distributed Supply Regulation
Battery-Powered Equipment

Part Models: 4
1ku List Price: Starting From $3.21

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
LT3493EDCB#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3493EDCB#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3493IDCB#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3493IDCB#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 2
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Power System Managers & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3493
LT3493-3

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

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.

Evaluation Kits

LT3493EDCB Demo Board | 4.5V ≤ VIN ≤ 36V, VOUT = 3.3V @ 1.2A

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Product Details

Demonstration circuit 897 is a monolithic step-down DC/DC swithcing regulator featureing the LT3493. The demo board is designed to provide 3.3V @ 1.2A from a 4.5V to 36V input. Other features of the LT3493 include a fixed 750kHz switching frequency and Internal compenation

Resources

DC897A - Design File
9/24/2009

DC897A - Demo Manual
9/24/2009

DC897A - Schematic
9/24/2009

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