LT8611

RECOMMENDED FOR NEW DESIGNS

42V, 2.5A Synchronous Step-Down Regulator with Current Sense and 2.5μA Quiescent Current

Data Sheet (Rev. D) Product Selection Table

Part Models: 8
1ku List Price: Starting From $4.55

Viewing:

Part Details

Rail-to-Rail Current Sense Amplifier with Monitor
Wide Input Voltage Range: 3.4V to 42V
Ultralow Quiescent Current Burst Mode^® Operation:

2.5μA I_Q Regulating 12V_IN to 3.3V_OUT
Output Ripple < 10mV_P-P

High Efficiency Synchronous Operation:

96% Efficiency at 1A, 5V_OUT from 12V_IN
94% Efficiency at 1A, 3.3V_OUT from 12V_IN

Fast Minimum Switch-On Time: 50ns
Low Dropout Under All Conditions: 200mV at 1A

Allows Use Of Small Inductors
Low EMI
Adjustable and Synchronizable: 200kHz to 2.2MHz
Current Mode Operation
Accurate 1V Enable Pin Threshold
Internal Compensation
Output Soft-Start and Tracking
Small Thermally Enhanced 3mm × 5mm 24-Lead QFN Package
AEC-Q100 Qualified for Automotive Applications

Part Models: 8
1ku List Price: Starting From $4.55

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
LT8611EUDD#PBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8611EUDD#TRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8611EUDD#WPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8611EUDD#WTRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8611IUDD#PBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8611IUDD#TRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8611IUDD#WPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8611IUDD#WTRPBF	24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LT8611EUDD#PBF	PRODUCTION
LT8611EUDD#TRPBF	PRODUCTION
LT8611EUDD#WPBF
LT8611EUDD#WTRPBF
LT8611IUDD#WPBF
LT8611IUDD#WTRPBF
Sep 30, 2020 - 20_0293 Test Site Transfer from Analog Devices Singapore to UTAC Thailand
		PCN20_0293_Form Material_Report Delta Qualification Matrix Qualification Results Summary Test Correlation Report Test Correlation Report Other Qualification Results Summary
LT8611EUDD#PBF	PRODUCTION
LT8611EUDD#TRPBF	PRODUCTION
LT8611IUDD#PBF	PRODUCTION
LT8611IUDD#TRPBF	PRODUCTION
Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LT8611EUDD#PBF	PRODUCTION
LT8611EUDD#TRPBF	PRODUCTION
LT8611IUDD#PBF	PRODUCTION
LT8611IUDD#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
High Voltage Hot Swap Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
PowerPath, Ideal Diodes, and Load Switches 1
LTC4370	RECOMMENDED FOR NEW DESIGNS	Two-Supply Diode-OR Current Balancing Controller

Tools & Simulations

LTspice 5

Models for the following parts are available in LTspice:

LT8611

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

LT8611 Demo Board | Micropower Sync Buck with Current Sense, 3.8V ≤ VIN ≤ 42V, VOUT = 3.3V @ 2.5A

Buy Now View Details

Product Details

Demonstration circuit 1750A is a 42V, 2.5A micropower synchronous step-down regulator with current sense featuring the LT8611. The LT8611 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 2.5μA of quiescent current when the output is regulated at 3.3V. The demo board has an input voltage range from 3.8V to 42V and provides an output of 3.3V @ 2.5A.

The current limit can be moved to the input side for application where input supply current is limited, such as energy harvesting application. ICTRL and IMON on the board set and monitor the regulated current respectively.

Resources

DC1750A - Demo Manual
268.00K

DC1750A - Design Files
763.00K

DC1750A - Schematic
41.00K

Latest Discussions

15 Weeks Ago

3 Years Ago

LT8611

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Application Note 1

Design Note 1

Technical Articles 3

Solutions Bulletin & Brochure 1