LT8613

RECOMMENDED FOR NEW DESIGNS

42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current

Data Sheet (Rev. A) Product Selection Table

Part Models: 4
1ku List Price: Starting From $6.20

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Overview

Rail-to-Rail Current Sense Amplifier with Monitor
Wide Input Voltage Range: 3.4V to 42V
Ultralow Quiescent Current Burst Mode^® Operation:
- 3μA I_Q Regulating 12V_IN to 3.3V_OUT
- Output Ripple < 10mV_P-P
High Efficiency Synchronous Operation:
- 95% Efficiency at 3A, 5V_OUT from 12V_IN
- 94% Efficiency at 3A, 3.3V_OUT from 12V_IN
Fast Minimum Switch-On Time: 40ns

Low Dropout Under All Conditions: 250mV at 3A
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 × 6mm 28-Lead QFN Package

The LT8613 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 3µA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. The built-in current sense amplifier with monitor and control pins allows accurate input or output current regulation and limiting. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mV_P-P. A SYNC pin allows synchronization to an external clock. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program V_IN undervoltage lockout or to shut down the LT8613 reducing the input supply current to 1µA. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up. The PG flag signals when V_OUT is within ±9% of the programmed output voltage as well as fault conditions. The LT8613 is available in a small 28-lead 3mm × 6mm QFN package with exposed pad for low thermal resistance.

Applications

Automotive and Industrial Supplies
General Purpose Step-Down
CCCV Power Supplies

Part Models: 4
1ku List Price: Starting From $6.20

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
LT8613EUDE#PBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8613EUDE#TRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8613IUDE#PBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8613IUDE#TRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 11, 2020 - 20_0013 LT8613 Data Sheet Limit Change
		PCN20_0013_Form Material_Report Datasheet Specification Comparison
LT8613EUDE#PBF	PRODUCTION
LT8613EUDE#TRPBF	PRODUCTION
LT8613IUDE#PBF	PRODUCTION
LT8613IUDE#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
LT8613EUDE#PBF	PRODUCTION
LT8613EUDE#TRPBF	PRODUCTION
LT8613IUDE#PBF	PRODUCTION
LT8613IUDE#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
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 1

LT8613 Demo Circuit - 5V Step-Down Converter with 6A Output Current Limit (5.8-42V to 5V @ 6A)

Models for the following parts are available in LTspice:

LT8613

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

LT8613EUDE Demo Board | Sync Buck, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

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Product Details

Demonstration Circuit 2011A is a 42V, 6A micropower synchronous step-down regulator with current sense featuring the LT8613. The demo board is designed for 5V output from a 5.8V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8613 is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated power switches and inclusion of all necessary circuitry reduce the components count and solution size. Ultralow 3μA quiescent current in Burst Mode^® operation achieves high efficiency at very light loads. Fast minimum on-time of 40ns enables high V_IN to low V_OUT conversion at high frequency.

Resources

DC2011A - Design Files
9/27/2016

DC2011A - Demo Manual
5/8/2015

DC2011A - Schematic
5/4/2015

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Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 2