LT3995

PRODUCTION

60V, 3A, 2MHz Step-Down Switching Regulator with 2.7μA Quiescent Current

Data Sheet (Rev. B) Product Selection Table

Part Models: 8
1ku List Price: Starting From $4.25

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Overview

Ultralow Quiescent Current: 2.7μA I_Q at 12V_IN to 3.3V_OUT
Low Ripple Burst Mode^® Operation Output Ripple < 15mV_P-P
Wide Input Range: Operation from 4.3V to 60V
3A 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: I_Q = 700nA
Power Good Flag
Soft-Start Capability
Thermal Shutdown Protection
Current Limit Foldback with SS Override
Saturating Switch Design: 85mΩ On Resistance
Small, Thermally Enhanced 16-Lead MSOP Package
AEC-Q100 Qualified for Automotive Applications

The LT3995 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 60V. Low quiescent current design consumes only 2.7μA 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 LT3995 can supply up to 3A 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 85mΩ switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. 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 V_OUT reaches 91.6% of the programmed output voltage. The LT3995 is available in a small 16-lead MSOP package with exposed pad for low thermal resistance.

APPLICATIONS

Automotive Battery Regulation
Portable Products
Industrial Supplies

Part Models: 8
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
LT3995EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3995EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3995HMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3995HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3995IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3995IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3995IMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3995IMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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
LT3995EMSE#PBF	PRODUCTION
LT3995EMSE#TRPBF	PRODUCTION
LT3995IMSE#PBF	PRODUCTION
LT3995IMSE#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
LT3995EMSE#PBF	PRODUCTION
LT3995EMSE#TRPBF	PRODUCTION
LT3995HMSE#PBF	PRODUCTION
LT3995HMSE#TRPBF	PRODUCTION
LT3995IMSE#PBF	PRODUCTION
LT3995IMSE#TRPBF	PRODUCTION
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
LT3995HMSE#PBF	PRODUCTION
LT3995HMSE#TRPBF	PRODUCTION
Apr 17, 2025 - 25_0119 Bond Wire Change from Gold to Copper (Automotive)
		PCN25_0119_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LT3995IMSE#WPBF	PRODUCTION
LT3995IMSE#WTRPBF	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
Protection Switches & Controllers 2
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller

Tools & Simulations

LTspice 1

LT3995 Demo Circuit - 3.3V Step-Down Converter (4.3-60V to 3.3V @ 3A)

Models for the following parts are available in LTspice:

LT3995

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

LT3995 Demo Board | Micropower Buck, 4.3V ≤ VIN ≤ 60V, VOUT = 3.3V @ 3A

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Product Details

Demonstration circuit 1832A is a monolithic step-down DC/DC switching regulator featuring the LT3995. The LT3995 is a compact, high efficiency monolithic step-down switching regulator that consumes only 2.7μA of quiescent current. The demo circuit is designed for 3.3V, 3A output from a 4.3V to 60V 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. The RT resistor (R5) should be chosen to set the LT3995 internal switching frequency at least 20% below the lowest synchronization input frequency.