LTC1911

PRODUCTION

Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter

Part Models: 4
1ku List Price: Starting From $3.08

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Overview

Low Noise Constant Frequency Operation
2.7V to 5.5V Input Voltage Range
No Inductors
Typical Efficiency 25% Higher Than LDOs
Shutdown Disconnects Load from V_IN
Output Voltage: 1.8V ±4% or 1.5V ±4%
Output Current: 250mA
Low Operating Current: I_IN = 180µA Typ
Low Shutdown Current: I_IN = 10µA Typ
Oscillator Frequency: 1.5MHz
Soft-Start Limits Inrush Current at Turn On
Short-Circuit and Overtemperature Protected
Available in an 8-Pin MSOP Package

The LTC1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses 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 over 25% higher than that of a linear regulator.

A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (f_OSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency,the part enters Burst Mode^® operation under light load conditions.

Low operating current (180µA with no load, 10µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make the LTC1911 ideally suited for space constrained battery powered applications. The part is short-circuit and over temperature protected, and is available in an 8-pin MSOP package.

Applications

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

Part Models: 4
1ku List Price: Starting From $3.08

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
LTC1911EMS8-1.5#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1911EMS8-1.5#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1911EMS8-1.8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1911EMS8-1.8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1911EMS8-1.5#PBF	PRODUCTION
LTC1911EMS8-1.5#TRPBF	PRODUCTION
LTC1911EMS8-1.8#PBF	PRODUCTION
LTC1911EMS8-1.8#TRPBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LTC1911EMS8-1.5#PBF	PRODUCTION
LTC1911EMS8-1.5#TRPBF	PRODUCTION
LTC1911EMS8-1.8#PBF	PRODUCTION
LTC1911EMS8-1.8#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:

LTC1911-1.5
LTC1911-1.8

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.