LTC3531

RECOMMENDED FOR NEW DESIGNS

200mA Buck-Boost Synchronous DC/DC Converters

Part Models: 10
1ku List Price: Starting From $2.36

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Overview

Regulated Output with Input Above, Below or Equal to the Output
Single Inductor
Up to 90% Efficiency
V_IN Range: 1.8V to 5.5V
200mA at 3.3V_OUT from 3.6V Input
125mA at 3V_OUT from 2.5V Input
Fixed V_OUT Versions (TSOT, DFN): 3.3V, 3V
Adjustable V_OUT Version (DFN): 2V to 5V
Burst Mode^® Operation, No External Compensation
Ultra Low Quiescent Current: 16μA, Shutdown Current <1μA
Only 3 External Components Required
(Fixed Voltage Versions)
Short-Circuit Protection
Output Disconnect in Shutdown
Available in 6-Pin ThinSOT and 3mm × 3mm DFN Packages

The LTC3531/LTC3531-3.3/LTC3531-3 are synchronous buck-boost DC/DC converters that operate from input voltages above, below or equal to the output voltage. The topology incorporated in the ICs provides a continuous transfer through all operating modes, making the product ideal for single cell Li-Ion and multicell alkaline or nickel applications. The converters operate in Burst Mode, minimizing solution footprint and component count as well as providing high conversion efficiency over a wide range of load currents.

The devices include two 0.5Ω N-channel MOSFET switches and two P-channel switches (0.5Ω, 0.8Ω). Quiescent current is typically 16μA, making the parts ideal for battery power applications. Other features include a <1μA shutdown current, current limiting, thermal shutdown and output disconnect. The parts are offered in a 6-pin ThinSOT^™ package for fixed voltage versions or a 3mm × 3mm DFN package for fixed and adjustable versions.

Applications

Handheld Instruments
MP3 Players
Handheld computers
PDA/GPS

Part Models: 10
1ku List Price: Starting From $2.36

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
LTC3531EDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531EDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531EDD-3#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531EDD-3#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531EDD-3.3#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531EDD-3.3#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531ES6-3#TRMPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531ES6-3#TRPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531ES6-3.3#TRMPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3531ES6-3.3#TRPBF	6-Lead TSOT-23	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller

Tools & Simulations

LTspice 1

LTC3531 Demo Circuit - Buck-Boost Synchronous Converter (2.9V to 3.3V @ 200mA)

Models for the following parts are available in LTspice:

LTC3531
LTC3531-3
LTC3531-3.3

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

LTC3531ES6-3.3 | 200mA Buck-Boost Synchronous Converter

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Product Details

Demonstration circuit 877 is a high efficiency synchronous Buck-Boost converter using the LTC3531-3.3. The input range is from 1.8V to 5.5V making it ideal for single-cell Lithium-Ion, multicell alkaline or nickel battery applications. This converter can provide 200mA when the input voltage is above 2.9V.

The DC877 features the LTC3531-3.3 in a tiny 6-pin ThinSOT package. The converter operates in Burst Mode, which provides conversion efficiency over a wide range of load currents. It has minimum component count and tiny solution size. Other features include current limiting, thermal shutdown and output disconnect.

Resources

DC877A - Design File
9/24/2009

DC877A - Demo Manual
9/24/2009

DC877A - Schematic
9/24/2009

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