LT3682

PRODUCTION

LT3682

1A Micropower Step-Down Switching Regulator

PRODUCTION

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1ku List Price Starting From $3.54

Features

Wide Input Range:
- Operation from 3.6V to 36V
- Overvoltage Lockout Protects Circuits through 60V Transients
1A Output Current
Low Ripple Burst Mode^® Operation

I_Q = 75μA at 12V_IN to 3.3V_OUT
Output Ripple < 15mV_P-P

Adjustable Switching Frequency: 250kHz to 2.2MHz
Short-Circuit Protected
Synchronizable Between 300kHz and 2.2MHz
0.8V Feedback Reference Voltage
Output Voltage 0.8V to 20V
Soft-Start Capability
Power Good Flag
Small 12-Pin Thermally Enhanced 3mm × 3mm DFN Package

Additional Details

The LT3682 is an adjustable frequency (250kHz to 2.2MHz) monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 0.5Ω switch is included on the device along with a boost diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. A SYNC pin allows the user to synchronize the part to an external clock, and to choose between Low Ripple Burst Mode operation and standard PWM operation.

The Low Ripple Burst Mode maintains high efficiency at low output currents while keeping output ripple below 15mV in typical applications. Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when V_OUT reaches 90% of the programmed output voltage. Protection circuitry senses the current in the power switch and external Schottky catch diode to protect the LT3682 against short-circuit conditions. Frequency foldback and thermal shutdown provide additional protection.

The LT3682 is available in a 12-Pin 3mm × 3mm DFN with exposed pad for low thermal resistance.

Applications

Automotive Battery Regulation
Automotive Entertainment Systems
Industrial Supplies
Power for Portable Products
Distributed Supply Regulation

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $3.54

Technical Documents 4

LT3682: 1A Micropower Step-Down Switching Regulator Data Sheet 12/16/2008

R530 Reliability Data 03/26/2018

DC1222A - Demo Manual 09/24/2009

DN475 - μPower Buck Regulator Safely Rides Through Automotive Load Dumps 12/08/2009

Design Resources 4

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
LT3682EDD#PBF	12-Lead DFN (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3682EDD#TRPBF	12-Lead DFN (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3682IDD#PBF	12-Lead DFN (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3682IDD#TRPBF	12-Lead DFN (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3682EDD#PBF
Pin/Package Drawing
12-Lead DFN (3mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3682EDD#TRPBF
Pin/Package Drawing
12-Lead DFN (3mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3682IDD#PBF
Pin/Package Drawing
12-Lead DFN (3mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT3682IDD#TRPBF
Pin/Package Drawing
12-Lead DFN (3mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

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Surge Stopper, Overvoltage, and Overcurrent Protection1
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DC1222A

LT3682EDD Demo Board | 6.9V ≤ VIN ≤ 36V (60V Transients), VOUT = 5V @ 2A

DC1222A

LT3682EDD Demo Board | 6.9V ≤ VIN ≤ 36V (60V Transients), VOUT = 5V @ 2A

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Product Detail

Demonstration circuit 1222 is a monolithic stepdown DC/DC switching regulator featuring the LT3682. The demo board is designed for 5V at 1A (V_IN > 12V) from a 6.9V to 36V input, with transients up to 60V.

Resources

PDF

DC1222A - Demo Manual

608.00K

ZIP

DC1222A - Design File

508.00K

PDF

DC1222A - Schematic

24.00K

DC1222A

LT3682EDD Demo Board | 6.9V ≤ VIN ≤ 36V (60V Transients), VOUT = 5V @ 2A

LTspice 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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.