LT3976
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LT3976

40V, 5A, 2MHz Step-Down Switching Regulator with 3.3μA Quiescent Current

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LTspice LT6110/LT3976 Demo Circuit - Buck Regulator with Cable/Wire Voltage Drop Compensation (5-40V to 3.3V @ 5A) Download 4.00KB LTspice LT3976 Demo Circuit - 3.3V Step-Down Converter (4.3-42V to 3.3V @ 5A) Download 3.00KB LTspice LT3976 - Step-Down (Buck) Regulators Download 2.41 KB
Part Models 10
1ku List Price Starting From $4.48
Features
  • Ultralow Quiescent Current:
    • 3.3μA IQ at 12VIN to 3.3VOUT
  • Low Ripple Burst Mode® Operation
    • Output Ripple < 15mVP-P
  • Wide Input Range: Operation from 4.3V to 40V
  • 5A Maximum Output Current
  • Excellent Start-Up and Dropout Performance
  • Adjustable Switching Frequency: 200kHz to 2MHz
  • Synchronizable Between 250kHz to 2MHz
  • Accurate Programmable Undervoltage Lockout
  • Low Shutdown Current: IQ = 700nA
  • Power Good Flag
  • Soft-Start Capability
  • Thermal Shutdown Protection
  • Current Limit Foldback with Soft-Start Override
  • Saturating Switch Design: 75mΩ On-Resistance
  • Small, Thermally Enhanced 16-Lead MSOP and 24-Lead 3mm × 5mm QFN Packages
Additional Details
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The LT3976 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V. Low quiescent current design consumes only 3.3μA of supply current while regulating with no load. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 15mV in a typical application. The LT3976 can supply up to 5A of load current and has current limit foldback to limit power dissipation during short-circuit. A low dropout voltage of 500mV is maintained when the input voltage drops below the programmed output voltage, such as during automotive cold crank.

An internally compensated current mode topology is used for fast transient response and good loop stability. A high efficiency 75mΩ switch is included on the die along with a boost Schottky diode. An accurate 1.02V threshold enable pin can be driven directly from a microcontroller or used as a programmable undervoltage lockout. A capacitor on the SS pin provides a controlled inrush current (soft-start). A power good flag signals when VOUT reaches 91.6% of the programmed output voltage. The LT3976 is available in small 16-lead MSOP and 24-lead 3mm × 5mm QFN packages with exposed pad for low thermal resistance.

Applications

  • Automotive Battery Regulation
  • Portable Products
  • Industrial Supplies
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file View Data Sheet
Documentation View All Documentation
LTspice LT6110/LT3976 Demo Circuit - Buck Regulator with Cable/Wire Voltage Drop Compensation (5-40V to 3.3V @ 5A) Download 4.00KB LTspice LT3976 Demo Circuit - 3.3V Step-Down Converter (4.3-42V to 3.3V @ 5A) Download 3.00KB LTspice LT3976 - Step-Down (Buck) Regulators Download 2.41 KB
Part Models 10
1ku List Price Starting From $4.48
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LT3976

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UPDATED 01/04/2013
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LT3976: 40V, 5A, 2MHz Step-Down Switching Regulator with 3.3μA Quiescent Current Data Sheet

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UPDATED 06/06/2013
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LT3976: 静止電流が3.3µAの40V、5A、2MHz降圧スイッチング・レギュレータ データシート

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User Guide

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UPDATED 10/10/2012
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DC1848A - Demo Manual redirect icon

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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
LT3976EMSE#PBF 16-Lead MSOP w/ EP external-link
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LT3976EMSE#TRPBF 16-Lead MSOP w/ EP external-link
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LT3976EUDD#PBF 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3976EUDD#TRPBF 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LT3976HMSE#PBF 16-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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LT3976HMSE#TRPBF 16-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3976IMSE#PBF 16-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3976IMSE#TRPBF 16-Lead MSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LT3976IUDD#PBF 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LT3976IUDD#TRPBF 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3976EMSE#PBF

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Feb 4, 2020

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

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LT3976EMSE#TRPBF

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LT3976HMSE#PBF

PRODUCTION

LT3976HMSE#TRPBF

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LT3976IMSE#PBF

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LT3976IMSE#TRPBF

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Oct 11, 2022

- 22_0244

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LT3976EMSE#PBF

PRODUCTION

LT3976EMSE#TRPBF

PRODUCTION

LT3976HMSE#PBF

PRODUCTION

LT3976HMSE#TRPBF

PRODUCTION

LT3976IMSE#PBF

PRODUCTION

LT3976IMSE#TRPBF

PRODUCTION

pdf

PCN22_0244_Form

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xls

Material_Report

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pdf

Qualification Results Summary

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xlsm

Delta Qualification Matrix

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Feb 4, 2020

- 20_0132

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

LT3976EMSE#PBF

PRODUCTION

LT3976EMSE#TRPBF

PRODUCTION

LT3976HMSE#PBF

PRODUCTION

LT3976HMSE#TRPBF

PRODUCTION

LT3976IMSE#PBF

PRODUCTION

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Evaluation Kits 1

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DC1848A

LT3976 Demo Board I Buck with 3.3µA Iq, 4.3V ≤ VIN ≤ 40V, VOUT = 3.3V @ 5A

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DC1848A

LT3976 Demo Board I Buck with 3.3µA Iq, 4.3V ≤ VIN ≤ 40V, VOUT = 3.3V @ 5A

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DC1848A
LT3976 Demo Board I Buck with 3.3µA Iq, 4.3V ≤ VIN ≤ 40V, VOUT = 3.3V @ 5A
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Product Detail

Demonstration circuit 1848A is a monolithic step-down DC/DC switching regulator featuring the LT3976. The LT3976 is a compact, high efficiency, high speed monolithic stepdown switching regulator that consumes only 3.3μA of quiescent current. The demo circuit is designed for 3.3V, 5A output from a 4.3V to 40V input. The switching frequency can be programmed either via oscillator resistor or external clock up to 2MHz. To synchronize to an external clock, move JP2 to SYNC and apply the external clock to the SYNC turret.



Resources

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DC1848A - Demo Manual Download

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DC1848A - Schematic Download

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DC1848A - Design Files Download

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Evaluation Kits1

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DC1848A

LT3976 Demo Board I Buck with 3.3µA Iq, 4.3V ≤ VIN ≤ 40V, VOUT = 3.3V @ 5A

Tools & Simulations 1

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.

spice tool Lt Spice

LT6110/LT3976 Demo Circuit - Buck Regulator with Cable/Wire Voltage Drop Compensation (5-40V to 3.3V @ 5A) Download

4.00K

spice tool Lt Spice

LT3976 Demo Circuit - 3.3V Step-Down Converter (4.3-42V to 3.3V @ 5A) Download

3.00K

spice tool Lt Spice

LT3976 - Step-Down (Buck) Regulators Download

2.41 K

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