LTC1503

PRODUCTION

High Efficiency Inductorless Step-Down DC/DC Converter

Part Models: 11
1ku List Price: Starting From $2.48

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Overview

Input Voltage Range: 2.4V to 6V
Fixed Output Voltages: 1.8V ±4%, 2V ±4%
Output Current: Up to 100mA
No Inductors
Typical Efficiency 25% Higher than LDOs
Low Operating Current: 25µA
Low Shutdown Current: 5µA
600kHz Switching Frequency
Shutdown Disconnects Load from V_IN
Soft-Start Limits Inrush Current at Turn-On
Short-Circuit and Overtemperature Protected
Available in 8-Pin MSOP and SO Packages

The LTC1503-1.8/LTC1503-2 are switched capacitor step-down DC/DC converters that produce a regulated output from a 2.4V to 6V input. The parts use switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. Typical efficiency is 25% higher than that of a low dropout (LDO) linear regulator.

Regulation is achieved by sensing the output voltage and enabling the internal switching network as needed to maintain a fixed output voltage. This method of regulation enables the parts to achieve high efficiency at extremely light loads. Low operating current (25µA with no load, 5µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make the LTC1503-1.8/LTC1503-2 ideally suited for space constrained battery-powered applications. The parts are fully short-circuit and over temperature protected.

The LTC1503-1.8/LTC1503-2 are available in 8-pin MSOP and SO packages.

Applications

Cellular Phones
Handheld Computers
Smart Card Readers
Low Power DSP Supplies
Portable Electronic Equipment
Handheld Medical Instruments

Part Models: 11
1ku List Price: Starting From $2.48

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
LTC1503CMS8-1.8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503CMS8-1.8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503CMS8-2#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503CS8-1.8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503CS8-1.8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503CS8-2#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503CS8-2#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503IS8-1.8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503IS8-1.8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503IS8-2#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1503IS8-2#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC1503CMS8-1.8#PBF	PRODUCTION
LTC1503CMS8-1.8#TRPBF	PRODUCTION
LTC1503CMS8-2#PBF	PRODUCTION
Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3)
		PCN24_0004_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1503CMS8-1.8#PBF	PRODUCTION
LTC1503CMS8-1.8#TRPBF	PRODUCTION
LTC1503CMS8-2#PBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LTC1503CMS8-1.8#PBF	PRODUCTION
LTC1503CMS8-1.8#TRPBF	PRODUCTION
LTC1503CMS8-2#PBF	PRODUCTION
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
		PCN22_0255_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1503CS8-1.8#PBF	PRODUCTION
LTC1503CS8-1.8#TRPBF	PRODUCTION
LTC1503CS8-2#PBF	PRODUCTION
LTC1503CS8-2#TRPBF	PRODUCTION
LTC1503IS8-1.8#PBF	PRODUCTION
LTC1503IS8-1.8#TRPBF	PRODUCTION
LTC1503IS8-2#PBF	PRODUCTION
LTC1503IS8-2#TRPBF	PRODUCTION
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0026_Form Material_Report Delta Qualification Matrix
LTC1503CS8-1.8#PBF	PRODUCTION
LTC1503CS8-1.8#TRPBF	PRODUCTION
LTC1503CS8-2#PBF	PRODUCTION
LTC1503CS8-2#TRPBF	PRODUCTION
LTC1503IS8-1.8#PBF	PRODUCTION
LTC1503IS8-1.8#TRPBF	PRODUCTION
LTC1503IS8-2#PBF	PRODUCTION
LTC1503IS8-2#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC1503-1.8
LTC1503-2

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.