LT3845A

RECOMMENDED FOR NEW DESIGNS

High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency

Part Models: 6
1ku List Price: Starting From $4.90

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Overview

High Voltage Operation: Up to 60V
Synchronizable Up to 600kHz
Adjustable Constant Frequency: 100kHz to 500kHz
Output Voltages Up to 36V
Stable Operation in Current Limit
Adaptive Nonoverlap Circuitry Prevents Switch Shoot-Through
Reverse Inductor Current Inhibit for Discontinuous Operation Improves Efficiency with Light Loads

Programmable Soft-Start
120μA No Load Quiescent Current
10μA Shutdown Supply Current
1% Regulation Accuracy
Standard Gate N-Channel Power MOSFETs
Reverse Overcurrent Protection
16-Lead Thermally Enhanced TSSOP Package

The LT3845A is a high voltage, synchronous, current mode controller used for medium to high power, high efficiency supplies. It offers a wide 4V to 60V input range (7.5V minimum start-up voltage). An onboard regulator simplifies the biasing requirements by providing IC power directly from V_IN.

Burst Mode^® operation maintains high efficiency at light loads by reducing IC quiescent current to 120μA. Light load efficiency is also improved with the reverse inductor current inhibit function which supports discontinuous operation.

Additional features include adjustable fixed operating frequency that can be synchronized to an external clock for noise sensitive applications, gate drivers capable of driving large N-channel MOSFETs, a precision undervoltage lockout, 10μA shutdown current, short-circuit protection and a programmable soft-start.

The LT3845A is available in a 16-lead thermally enhanced TSSOP package.


	Features
LT3845	-
LT3845A	Improved Performance In Over Current Conditions

Applications

12V and 42V Automotive and Heavy Equipment
48V Telecom Power Supplies
Avionics and Industrial Control Systems
Distributed Power Converters

Part Models: 6
1ku List Price: Starting From $4.90

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
LT3845AEFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3845AEFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3845AIFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3845AIFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3845AMPFE#PBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3845AMPFE#TRPBF	16-Lead TSSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT3845AEFE#PBF	PRODUCTION
LT3845AEFE#TRPBF	PRODUCTION
LT3845AIFE#PBF	PRODUCTION
LT3845AIFE#TRPBF	PRODUCTION
LT3845AMPFE#PBF	PRODUCTION
LT3845AMPFE#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
Circuit Monitors 2
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
LT2940	PRODUCTION	Power and Current Monitor
Protection Switches & Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3845
LT3845A

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT3845
LT3845A

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

LT3845AEFE Demo Board | 16V ≤ VIN ≤ 60V, VOUT = 12V @ 10A

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Product Details

Demonstration Circuit 1619A is a 100kHz to 500kHz programmable frequency, high voltage, current mode DC/DC step-down converter featuring the LT3845A. The operating frequency can be synchronized up to 600kHz. This demo board is designed for 12V output at up to 10A (120W) from a 16V to 60V input.

Resources

DC1619A - Schematic
3/21/2012

DC1619A - Design Files
3/17/2011

DC1619A - Demo Manual
3/14/2011

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