LTC3533

RECOMMENDED FOR NEW DESIGNS

2A Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

Part Models: 2
1ku List Price: Starting From $4.25

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Overview

Regulated Output with Input Voltages Above, Below or Equal to the Output
1.8V to 5.5V (Input) and 5.25V (Output) Voltage Range
0.8A Continuous Output Current: V_IN > 1.8V
2A Continuous Output Current: V_IN > 3V
Single Inductor
Synchronous Rectification: Up to 96% Efficiency
Programmable Burst Mode^® Operation: I_Q = 40µA
Output Disconnect in Shutdown
Programmable Frequency from 300kHz to 2MHz
<1µA Shutdown Current
Small Thermally Enhanced 14-Lead (3mm × 4mm × 0.75mm) DFN package

The LTC3533 is a wide V_IN range, highly efficient, fixed frequency, buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single cell lithium-ion/polymer or multi-cell alkaline/NiMH applications where the output voltage is within the input voltage range.

The LTC3533 features programmable Burst Mode operation, extended V_IN and V_OUT ranges down to 1.8V, and increased output current. Switching frequencies up to 2MHz are programmed with an external resistor. The Burst Mode threshold is programmed with a single resistor from the BURST pin to GND.

Other features include 1µA shutdown current, short circuit protection, programmable soft-start, current limit and thermal shutdown. The LTC3533 is housed in the thermally enhanced 14-lead (3mm × 4mm × 0.75mm) DFN package.

Applications

GSM Modems
Handheld Instruments
Digital Cameras
Smart Phones
Media Players
Miniature Hard Disk Drive Power

Part Models: 2
1ku List Price: Starting From $4.25

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
LTC3533EDE#PBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3533EDE#TRPBF	14-Lead DFN (4mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3533EDE#PBF	PRODUCTION
LTC3533EDE#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
Switching Regulators & Controllers 1
LTC3112	RECOMMENDED FOR NEW DESIGNS	15V, 2.5A Synchronous Buck-Boost DC/DC Converter

Tools & Simulations

LTspice 1

LTC3533 Demo Circuit - 2A Wide Inut Voltage Synchronous Buck-Boost Converter (1.8-5.5V to 3.3V @ 1.5A)

Models for the following parts are available in LTspice:

LTC3533

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

LTC3533EDE Demo Board | High Efficiency Synchronous Buck-Boost Converter

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Product Details

Demonstration circuit 999A is a wide input range, 3.3V, synchronous buck-boost converter featuring the LTC3533. This circuit is designed to demonstrate the high level of performance, efficiency and small solution size attainable using this part in a buck-boost power supply. It operates at 1MHz and produces a regulated 3.3V from an input voltage range of 2.4V to 5.5V, and operates down to 1.8V with de-rated output current.