LT3680

PRODUCTION

36V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75µA Quiescent Current

Data Sheet (Rev. D) Product Selection Table

Part Models: 10
1ku List Price: Starting From $4.95

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Overview

Wide Input Voltage Range: 3.6V to 36V
3.5A Maximum Output Current
Low Ripple (<15mV_P-P) Burst Mode^® Operation:
- I_Q = 75µA at 12V_IN to 3.3V_OUT
Adjustable Switching Frequency: 200kHz to 2.4MHz
Low Shutdown Current: I_Q < 0.5µA
Integrated Boost Diode
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 95mΩ On-Resistance
0.790V Feedback Reference Voltage
Output Voltage: 0.79V to 30V
Thermal Protection
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages

The LT3680 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 95mΩ 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. Low ripple Burst Mode^® operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3680 can further enhance low output current efficiency by drawing bias current from the output when V_OUT is above 3V. 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 91% of the programmed output voltage. The LT3680 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: 10
1ku List Price: Starting From $4.95

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
LT3680EDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680EDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680EMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680EMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680HMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680HMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680IDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680IDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680IMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3680IMSE#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
LT3680EMSE#PBF	PRODUCTION
LT3680EMSE#TRPBF	PRODUCTION
LT3680IMSE#PBF	PRODUCTION
LT3680IMSE#TRPBF	PRODUCTION
Apr 18, 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
LT3680EMSE#PBF	PRODUCTION
LT3680EMSE#TRPBF	PRODUCTION
LT3680IMSE#PBF	PRODUCTION
LT3680IMSE#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
LT3680EMSE#PBF	PRODUCTION
LT3680EMSE#TRPBF	PRODUCTION
LT3680HMSE#PBF	PRODUCTION
LT3680HMSE#TRPBF	PRODUCTION
LT3680IMSE#PBF	PRODUCTION
LT3680IMSE#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT3680HMSE#PBF	PRODUCTION
LT3680HMSE#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
Oscillators 1
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
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
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection

Tools & Simulations

LTspice 1

LT3680 Demo Circuit - 36V, 3.5A, 2.4MHz Step-Down Regulator with 75µA Iq (24V to 5V @ 3.5A)

Models for the following parts are available in LTspice:

LT3680

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

LT3680EMSE Demo Board | 6.3V ≤ VIN ≤ 36V, VOUT = 5V @ 3.5A

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Product Details

Demonstration circuit 1149 is a monolithic step-down DC/DC switching regulator featuring LT3680. The LT3680 can be synchronized over a 250 kHz to 2 MHz range. The demo board is designed for 5V/3.5A output from a 6.3V to 36V input.

Resources

DC1149A - Schematic
10/6/2009

DC1149A - Demo Manual
10/6/2009

DC1149A - Design Files
10/6/2009

Latest Discussions

2 Years Ago

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Spec Notice 1