LT3980

PRODUCTION

58V, 2A, 2.4MHz Step-Down Switching Regulator with 85μA Quiescent Current

Part Models: 10
1ku List Price: Starting From $4.25

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Overview

Wide Input Range: Operation from 3.6V to 58V
Overvoltage Lockout Protects Circuits Through 80V Transients
2A Maximum Output Current
Low Ripple (<15mV_P-P) Burst Mode^® Operation: I_Q = 85μA at 12V_IN to 3.3V_OUT
Adjustable Switching Frequency: 100kHz to 2.4MHz
Low Shutdown Current: I_Q < 1μA
Catch Diode Current Sense Protects Circuit Through Short-Circuit and Input Overvoltage
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 200mΩ On-Resistance
Thermal Protection
Soft-Start Capability
Small 16-Pin Thermally Enhanced MSOP and 3mm × 4mm DFN Packages

The LT3980 is an adjustable frequency (100kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 58V (80V transient). A high efficiency 200mΩ 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. Catch diode current sense (DA pin) protects the circuit during input voltage transients even when a high switching frequency is used. 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 LT3980 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 LT3980 is available in 16-pin MSOP and 3mm × 4mm DFN packages with exposed pads for low thermal resistance.

Applications

Automotive Battery Regulation
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation

Part Models: 10
1ku List Price: Starting From $4.25

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
LT3980EDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980EDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980HMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980IDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980IDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3980IMSE#TRPBF	16-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
LT3980EMSE#PBF	PRODUCTION
LT3980EMSE#TRPBF	PRODUCTION
LT3980HMSE#PBF	PRODUCTION
LT3980HMSE#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
LT3980EMSE#PBF	PRODUCTION
LT3980EMSE#TRPBF	PRODUCTION
LT3980HMSE#PBF	PRODUCTION
LT3980HMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LT3980EMSE#PBF	PRODUCTION
LT3980EMSE#TRPBF	PRODUCTION
LT3980HMSE#PBF	PRODUCTION
LT3980HMSE#TRPBF	PRODUCTION
LT3980IMSE#PBF	PRODUCTION
LT3980IMSE#TRPBF	PRODUCTION
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LT3980IDE#PBF	PRODUCTION
LT3980IDE#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
LT3980IMSE#PBF	PRODUCTION
LT3980IMSE#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
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 2
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection
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

LT3980 Demo Circuit - 58V, 2A 2.4MHz Step-Down Regulator with 85µA Iq (6.5-58V to 5V @ 2A)

Models for the following parts are available in LTspice:

LT3980

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT3980

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

LT3980EMSE Demo Board | 6.8V ≤ VIN ≤ 58V (80V Transients), VOUT = 5V @ 2A

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Product Details

Demonstration circuit 1476A is a 2A, 58V step-down switching regulator with 75µA quiescent current featuring the LT3980EMSE. The demo board is designed for a 5V/2A output from a 6.8V to 58V input with transients up to 80V.

Resources

DC1476A - Schematic
10/21/2009

DC1476A - Design Files
10/21/2009

DC1476A - Demo Manual
10/21/2009

Reference Designs

View Detailed Reference Design

Features and Benefits

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