LT3684

PRODUCTION

36V, 2A, 2.8MHz Step-Down Switching Regulator

Part Models: 8
1ku List Price: Starting From $3.54

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Overview

Wide Input Range: 3.6V to 34V Operating, 36V Maximum
2A Maximum Output Current
Adjustable Switching Frequency: 300kHz to 2.8MHz
Low Shutdown Current: I_Q < 1µA
Integrated Boost Diode
Power Good Flag
Saturating Switch Design: 0.18Ω On-Resistance
1.265V Feedback Reference Voltage
Output Voltage: 1.265V to 20V
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages

The LT3684 is an adjustable frequency (300kHz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum). A high efficiency 0.18Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. The LT3684’s high operating frequency allows the use of small, low cost inductors and ceramic capacitors resulting in low output ripple while keeping total solution size to a minimum. The low current shutdown mode 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. The LT3684 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with Exposed Pads for low thermal resistance.

Applications

Automotive Battery Regulation
Power for Portable Products
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation

Part Models: 8
1ku List Price: Starting From $3.54

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
LT3684EDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3684EDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3684EMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3684EMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3684IDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3684IDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3684IMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3684IMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3684EMSE#PBF	PRODUCTION
LT3684EMSE#TRPBF	PRODUCTION
LT3684IMSE#PBF	PRODUCTION
LT3684IMSE#TRPBF	PRODUCTION
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]
		PCN22_0157_Form Material_Report Qualification Results Summary Delta Qualification Matrix Detailed Parts List
LT3684EMSE#PBF	PRODUCTION
LT3684EMSE#TRPBF	PRODUCTION
LT3684IMSE#PBF	PRODUCTION
LT3684IMSE#TRPBF	PRODUCTION
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3684EMSE#PBF	PRODUCTION
LT3684EMSE#TRPBF	PRODUCTION
LT3684IMSE#PBF	PRODUCTION
LT3684IMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LT3684EMSE#PBF	PRODUCTION
LT3684EMSE#TRPBF	PRODUCTION
LT3684IMSE#PBF	PRODUCTION
LT3684IMSE#TRPBF	PRODUCTION

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
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 1

LT3684 Demo Circuit - 36V, 2A, 2.8MHz Step-Down Regulator (24V to 3.3V @ 2A)

Models for the following parts are available in LTspice:

LT3684

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

LT3684EMSE Demo Board | 4.5V ≤ VIN ≤ 34V, VOUT = 3.3V @ 2A

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Product Details

Demonstration circuit 1188 is a monolithic step-down DC/DC switching regulator featuring the LT3684. The demo circuit is designed for a 3.3V @ 2A output from a 4.5V to 34V input.

Resources

DC1188A - Demo Manual
9/24/2009

DC1188A - Schematic
9/24/2009

DC1188A - Design File
9/24/2009

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