LTC3543

PRODUCTION

LTC3543

600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum

PRODUCTION

Efﬁciency and Power Loss vs Load Current slide

Efﬁciency and Power Loss vs Load Current

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1ku List Price Starting From $2.35

Features

600mA Output Current
2.5V to 5.5V Input Voltage Range
2.25MHz Constant-Frequency Operation, Spread Spectrum or Synchronized PLL (1MHz to 3MHz)
High Efficiency: Up to 95%
1A Peak Inductor Current
Very Low Quiescent Current: Only 45µA During Burst Mode Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Overtemperature Protected
Stable with Ceramic Capacitors
Shutdown Mode Draws <1µA Supply Current
±2% Output Voltage Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Soft-Start
Available in a Low Proﬁ le (0.75mm) 2mm × 3mm 6-Lead DFN Package

Additional Details

The LTC3543 is a high efficiency monolithic synchronous current mode buck regulator.

The switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors. In PLL mode, the LTC3543 can acquire frequencies between 1MHz and 3MHz. Also, the LTC3543 has spread spectrum capability providing a lower noise regulated output, as well as low noise at the input.

In Burst Mode^® operation, the supply current is only 45µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3543 ideally suited for single Li-Ion battery-powered applications. The 100% duty cycle provides a low dropout operation, extending the battery life in portable systems. Burst Mode operation increases efficiency at light loads, further extending battery life. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode.

Applications

Portable Instruments
Cellular Phones

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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.

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FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $2.35

Technical Documents 3

LTC3543: 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum Data Sheet 05/29/2009

R415 Reliability Data 03/23/2018

DC1008A - 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
LTC3543EDCB#TRMPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3543EDCB#TRPBF	6-Lead DFN (2mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3543EDCB#TRMPBF
Pin/Package Drawing
6-Lead DFN (2mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3543EDCB#TRPBF
Pin/Package Drawing
6-Lead DFN (2mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

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DC1008A

LTC3543EDC8 Demo Board | 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.8V @ 600mA

DC1008A

LTC3543EDC8 Demo Board | 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.8V @ 600mA

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Product Detail

Demonstration circuit 1008 is a step-down converter, using the LTC3543 monolithic synchronous buck regulator. The DC1008 has an input voltage range of 2.5V to 5.5V, and is capable of delivering up to 600 mA of output current in a small 2mm × 3mm DFN package. The default output voltage of the DC1008 is 1.8V, but can be set as low as 0.6V, the reference voltage of the LTC3543.

Resources

PDF

DC1008A - Schematic

29.00K

PDF

DC1008A - Demo Manual

407.00K

ZIP

DC1008A - Design File

508.00K

DC1008A

LTC3543EDC8 Demo Board | 2.5V ≤ VIN ≤ 5.5V, VOUT = 1.8V @ 600mA

LTspice 1

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.