LTC1649

PRODUCTION

3.3V Input High Power Step-Down Switching Regulator Controller

Part Models: 4
1ku List Price: Starting From $5.88

Viewing:

Overview

High Power 3.3V to 1.XV-2.XV Switching Regulator Controller: Up to 20A Output
All N-Channel External MOSFETs
Provides 5V MOSFET Gate Drive with 3.3V Input
Constant Frequency Operation Minimizes Inductor Size
Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
High Efficiency: Over 90% Possible
No Low-Value Sense Resistor Needed
Available in 16-Lead SO Package

The LTC1649 is a high power, high efficiency switching regulator controller optimized for use with very low supply voltages. It operates from 2.7V to 5V input, and provides a regulated output voltage from 1.26V to 2.5V at up to 20A load current. A typical 3.3V to 2.5V application features efficiency above 90% from 1A to 10A load. The LTC1649 uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or super-low-threshold devices.

The LTC1649 shares its internal switching architecture with the LTC1430, and features the same ±1% line, load and temperature regulation characteristics. Current limit is user-adjustable without requiring an external low-value sense resistor. The LTC1649 uses a 200kHz switching frequency and voltage mode control, minimizing external component count and size. Shutdown mode drops the quiescent current to below 10µA.

The LTC1649 is available in the 16-pin narrow SO package.

Applications

3.3V Input Power Supply for Low Voltage Microprocessors and Logic
Low Input Voltage Power Supplies
High Power, Low Voltage Regulators
Local Regulation for Multiple Voltage Distributed Power Systems

Part Models: 4
1ku List Price: Starting From $5.88

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
LTC1649CS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1649CS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1649IS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1649IS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0246_Form Material_Report Marking Comparison Delta Qualification Matrix
LTC1649CS#PBF	PRODUCTION
LTC1649CS#TRPBF	PRODUCTION
LTC1649IS#PBF	PRODUCTION
LTC1649IS#TRPBF	PRODUCTION
Oct 12, 2022 - 22_0252 Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package
		PCN22_0252_Form Material_Report Qualification Results Summary
LTC1649CS#PBF	PRODUCTION
LTC1649CS#TRPBF	PRODUCTION
LTC1649IS#PBF	PRODUCTION
LTC1649IS#TRPBF	PRODUCTION
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]
		PCN22_0173_Form Material_Report Delta Qualification Matrix
LTC1649CS#PBF	PRODUCTION
LTC1649CS#TRPBF	PRODUCTION
LTC1649IS#PBF	PRODUCTION
LTC1649IS#TRPBF	PRODUCTION

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

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 1
LTC3713	PRODUCTION	Low Input Voltage, High Power, No R_SENSE^™ Synchronous Buck DC/DC Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC1649

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.