LTC3544B

PRODUCTION

Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA

Part Models: 2
1ku List Price: Starting From $3.54

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Overview

High Efficiency: Up to 95%
Four Independent Regulators Provide Up to 300mA, 200mA, 200mA and 100mA Output Current
2.25V to 5.5V Input Voltage Range
2.25MHz Constant Frequency Operation
No Schottky Diodes Required
Low Dropout Operation: 100% Duty Cycle

Pulse Skipping at Low Load for Minimum Ripple
0.8V Reference Allows Low Output Voltages
Shutdown Mode Draws <1μA Supply Current
Current Mode Operation for Excellent Line and Load Transient Response
Overtemperature Protected
Low Profile (3mm × 3mm) 16-Lead QFN Package

The LTC3544B is a quad, high efficiency, monolithic synchronous buck regulator using a constant frequency, current mode architecture. The four regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3544B well suited for single Li-Ion/polymer battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime in portable systems. At moderate and low output load levels PWM pulse skip mode operation provides very low output ripple voltage for noise sensitive applications.

Switching frequency is internally set to 2.25MHz, allowing the use of small surface mount inductors and capacitors.

The internal synchronous switches increase efficiency and eliminate the need for external Schottky diodes. Low output voltages are easily supported with the 0.8V feedback reference voltage.

The LTC3544B is available in a low profile (0.75mm) (3mm × 3mm) QFN package.


	Light Load Operation
LTC3544	Burst Mode (20mVpp), < 70uA Iq
LTC3544B	Pulse Skip Mode

Applications

Cellular Telephones
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
Media Players
Portable Instruments

Part Models: 2
1ku List Price: Starting From $3.54

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
LTC3544BEUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3544BEUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	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
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller
Supervisory Circuits & Reset ICs 1
LTC2935	PRODUCTION	Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3544
LTC3544B

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.