LT3481

PRODUCTION

36V, 2A, 2.8MHz Step-Down Switching Regulator with 50µA Quiescent Current

Data Sheet

Part Models: 12
1ku List Price: Starting From $3.89

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Part Details

Wide Input Range: 3.6V to 34V Operating, 36V Maximum
2A Maximum Output Current
Low Ripple Burst Mode^® Operation
- 50µA I_Q at 12V_IN to 3.3V_OUT
- Output Ripple < 15mV
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
Synchronizable Between 275kHz to 475kHz
Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages

Part Models: 12
1ku List Price: Starting From $3.89

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
LT3481EDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481EDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481EMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481EMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481HDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481HDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481HMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481HMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481IDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481IDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481IMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3481IMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN
No Match Found
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
LT3481EMSE#PBF	PRODUCTION
LT3481EMSE#TRPBF	PRODUCTION
LT3481HMSE#PBF	PRODUCTION
LT3481HMSE#TRPBF	PRODUCTION
LT3481IMSE#PBF	PRODUCTION
LT3481IMSE#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
LT3481EMSE#PBF	PRODUCTION
LT3481EMSE#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
LT3481EMSE#PBF	PRODUCTION
LT3481EMSE#TRPBF	PRODUCTION
Mar 25, 2021 - 21_0067 Test Platform Conversion for LT3481 MSOP
		PCN21_0067_Form Material_Report Test Correlation Report
LT3481EMSE#PBF	PRODUCTION
LT3481EMSE#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
LT3481EMSE#PBF	PRODUCTION
LT3481EMSE#TRPBF	PRODUCTION
LT3481HMSE#PBF	PRODUCTION
LT3481HMSE#TRPBF	PRODUCTION
LT3481IMSE#PBF	PRODUCTION
LT3481IMSE#TRPBF	PRODUCTION

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

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 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:

LT3481

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

LT3481EMSE/EDD Demo Board | 2 Circuits, Integrated Boost Diode, 4.5V ≤ VIN ≤ 34V, VOUT1 = 5V @ 2A; and 8.5V ≤ VIN ≤ 22V, VOUT2 = 3.3V @ 2A

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Product Details

Demonstration circuit 857 features the LT3481EMSE and LT3481EDD in two step-down converter circuits, one configured for high efficiency and the other for small size. The high efficiency circuit switching at 800kHz is designed for 3.3V/2A output from a 4.5V to 34V input. The small size circuit switching at 2MHz demonstrates the LT3481’s ability to operate with a small inductor and output capacitor. It is designed for 5V output from an 8.5V to 22V input. The wide input range of the LT3481 allows a variety of input sources. The typical sources are automotive batteries, wall adaptors and industrial supplies. The current mode control scheme creates fast transient response and good loop stability. In addition, the LT3481’s integrated boost diode reduces the parts count. The low ripple Burst Mode^® Operation of LT3481 not only allows the circuit to have high efficiency over a broad current range but also provides the low output ripple at light load conditions.

Resources

DC857A - Design File
9/24/2009

DC857A - Schematic
9/24/2009

DC857A - Demo Manual
9/24/2009

Reference Designs

View Detailed Reference Design

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

Part Used

View Detailed Reference Design

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

Part Used

View Detailed Reference Design

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications