LT3988

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LT3988

Dual 60V Monolithic 1A Step-Down Switching Regulator

PRODUCTION

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Part Models 6

1ku List Price Starting From $4.37

Features

Wide Input Range:
- Operation from 4.1V to 60V
- Overvoltage Lockout Protects Circuit Through 80V Transients
Two 1A Output Switching Regulators with Internal Power Switches
Short Circuit Robust
Adjustable 250kHz to 2.5MHz Switching Frequency, Synchronizable Over the Full Range
Integrated Boost Diodes
Integrated Loop Compensation
Anti-Phase Switching Reduces Ripple
Low Shutdown I_Q (<2μA)
Uses Small Inductors and Ceramic Capacitors
Thermally Enhanced, 16-Lead MSOP Package

Additional Details

The LT3988 is a dual, current mode, step-down, DC/DC converter that accepts two input voltages up to 60V (80V transient), which may be driven from separate supplies or can be cascaded. High efficiency switches are included on the die along with internal boost diodes and loop compensation. Both converters are capable of generating 1A outputs, are synchronized to a single oscillator programmable up to 2.5MHz, and run with opposite phases, reducing input ripple current.

The switching frequency is set with a single resistor yielding a range of 250kHz to 2.5MHz, or a clock signal can be applied to the SYNC pin. The LT3988’s high switching frequency allows the use of small inductors and capacitors, resulting in a very small dual output supply. The constant switching frequency, combined with low impedance ceramic capacitors, results in low, predictable output ripple. A current mode PWM architecture provides fast transient response with cycle-by-cycle current limiting. Diode current sense and thermal shutdown provide additional protection.

The LT3988 is available in a 16-lead MSOP package with an exposed pad for low thermal resistance.

Applications

Commercial Vehicle Battery Regulation
Industrial Supplies
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 6

1ku List Price Starting From $4.37

Technical Documents 3

LT3988: Dual 60V Monolithic 1A Step-Down Switching Regulator Data Sheet 05/22/2012

R530 Reliability Data 03/26/2018

DC1677A - Demo Manual 06/14/2012

Design Resources 6

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
LT3988EMSE#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3988EMSE#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3988HMSE#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3988HMSE#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3988IMSE#PBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3988IMSE#TRPBF	16-Lead MSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3988EMSE#PBF
Pin/Package Drawing
16-Lead MSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3988EMSE#TRPBF
Pin/Package Drawing
16-Lead MSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3988HMSE#PBF
Pin/Package Drawing
16-Lead MSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3988HMSE#TRPBF
Pin/Package Drawing
16-Lead MSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3988IMSE#PBF
Pin/Package Drawing
16-Lead MSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3988IMSE#TRPBF
Pin/Package Drawing
16-Lead MSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3988EMSE#PBF

PRODUCTION

LT3988EMSE#TRPBF

PRODUCTION

LT3988HMSE#PBF

PRODUCTION

LT3988HMSE#TRPBF

PRODUCTION

LT3988IMSE#PBF

PRODUCTION

LT3988IMSE#TRPBF

PRODUCTION

pdf

PCN22_0244_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Feb 4, 2020

- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3988EMSE#PBF

PRODUCTION

LT3988EMSE#TRPBF

PRODUCTION

LT3988HMSE#PBF

PRODUCTION

LT3988HMSE#TRPBF

PRODUCTION

LT3988IMSE#PBF

PRODUCTION

LT3988IMSE#TRPBF

PRODUCTION

pdf

PCN20_0132_Form

xls

Material_Report

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3988EMSE#PBF

PRODUCTION

LT3988EMSE#TRPBF

PRODUCTION

LT3988HMSE#PBF

PRODUCTION

LT3988HMSE#TRPBF

PRODUCTION

LT3988IMSE#PBF

PRODUCTION

LT3988IMSE#TRPBF

PRODUCTION

pdf

PCN22_0244_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Feb 4, 2020

- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

LT3988EMSE#PBF

PRODUCTION

LT3988EMSE#TRPBF

PRODUCTION

LT3988HMSE#PBF

PRODUCTION

LT3988HMSE#TRPBF

PRODUCTION

LT3988IMSE#PBF

PRODUCTION

LT3988IMSE#TRPBF

PRODUCTION

pdf

PCN20_0132_Form

xls

Material_Report

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Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

DC1677A

LT3988EMSE Demo Board I 7V ≤ VIN ≤60V, VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 1A

DC1677A

LT3988EMSE Demo Board I 7V ≤ VIN ≤60V, VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 1A

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Product Detail

Demonstration circuit 1677A is a dual 60V monolithic 1A step-down regulator featuring the LT3988. The demo board operates from inputs up to 60V. The outputs are 5V, 1A and 3.3V, 1A. The wide input range of the LT3988 allows a variety of input sources, such as commercial vehicle batteries and industrial supplies. The switching frequency can be programmed either via oscillator resistor or external clock over a 250kHz to 2.5MHz range. The LT3988 internal boost diodes and loop compensation reduce the components count and solution size. The current mode control scheme creates fast transient response and good loop stability. The EN/UVLO pin can be used to set the part in micropower shutdown mode, reducing the supply current to less than 2μA.

Resources

ZIP

DC1677A - Design Files

559.00K

PDF

DC1677A - Schematic

44.00K

PDF

DC1677A - Demo Manual

146.00K

DC1677A

LT3988EMSE Demo Board I 7V ≤ VIN ≤60V, VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 1A

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.