LTC3444

RECOMMENDED FOR NEW DESIGNS

LTC3444

Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

RECOMMENDED FOR NEW DESIGNS

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Features

Optimized Features for WCDMA Handsets
Regulated Output with Input Voltages Above, Below, or Equal to the Output
0.5V to 5V Output Range
Up to 400mA Continuous Output Current From a Single Lithium-Ion Cell
Minimal External Components
1.5MHz Fixed Frequency Operation
Internal Loop Compensation for Fast Response <25μs Full Scale Output Slewing; C_OUT 4.7μF
Output Disconnect in Shutdown
2.75V to 5.5V Input
<1μA Shutdown Current
Internal Soft-Start
Output Overvoltage Protection
Single Inductor, No Schottky Diodes Required
Small, Thermally Enhanced 8-Lead (3mm × 3mm) DFN Package

Additional Details

The LTC3444 is a highly efficient, fixed frequency, buck-boost DC/DC converter, which operates from input voltages above, below, and 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 a single Lithium-Ion or multi-cell applications where the output voltage can vary over a wide range.

The LTC3444 has been optimized for use in 3G WCDMA applications. A unique design yields high efficiency at very low output voltages while also eliminating external components. The high speed error amplifier provides the fast transient response required to slew the RF power amplifier from standby to transmit and transmit to stand by power levels. Output overvoltage protection protects the RF power amplifier.

Operating frequency is internally set to 1.5MHz to minimize external component size while maximizing efficiency.

Other features include <1μA shutdown current, internal soft-start, peak current limit and thermal shutdown. The LTC3444 is available in a small, thermally enhanced 8-lead (3mm × 3mm) DFN package.

Applications

WCDMA Applications–3G Handsets with High Speed Data Rate Capability
MP3 Players
Digital Cameras

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Ask a Question

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

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Part Models 2

1ku List Price Starting From $2.90

Technical Documents 3

LTC3444: Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications Data Sheet 11/12/2007

R415 Reliability Data 03/23/2018

DC901A - Demo Manual 09/24/2009

Design Resources 2

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
LTC3444EDD#PBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3444EDD#TRPBF	8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3444EDD#PBF
Pin/Package Drawing
8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3444EDD#TRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 3mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

DC901A

LTC3444EDD Demo Board | Synchronous Buck-Boost, for CDMA & HSDPA, 3.1V ≤ VIN ≤ 5V, VOUT = 0.8V to 4.2V @ 400mA

DC901A

LTC3444EDD Demo Board | Synchronous Buck-Boost, for CDMA & HSDPA, 3.1V ≤ VIN ≤ 5V, VOUT = 0.8V to 4.2V @ 400mA

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Product Detail

Demonstration circuit 901A features the LTC3444 and is a highly efficient, 1.5MHz fixed frequency buck-boost DC/DC converter. The input voltage can range from 3.1V to 5.0V and is suitable for Li-Ion or three-cell NiCd/NiMH battery applications while the output voltage can be set anywhere from 0.8V to 4.2V by injecting a 0.35V to 2.4V control signal. The demo board provides up to 400mA of output current.

Resources

PDF

DC901A - Demo Manual

308.00K

ZIP

DC901A - Design File

4.00M

PDF

DC901A - Schematic

67.00K

DC901A

LTC3444EDD Demo Board | Synchronous Buck-Boost, for CDMA & HSDPA, 3.1V ≤ VIN ≤ 5V, VOUT = 0.8V to 4.2V @ 400mA

LTspice 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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.