LTC3548A

PRODUCTION

Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

Part Models: 8
1ku List Price: Starting From $3.28

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Overview

High Efficiency: Up to 95%
Low Ripple (<35mV_P-P) Burst Mode Operation; I_Q = 40μA
2.25MHz Constant Frequency Operation
High Switch Current: 0.7A and 1.2A
No Schottky Diodes Required
Low R_DS(ON) Internal Switches: 0.35Ω
Current Mode Operation for Excellent Line and Load Transient Response

Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I_Q <1μA
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Optional External Soft-Start
Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages

The LTC3548A is a dual, constant frequency, synchronous step-down DC/DC converter. Intended for low power applications, it operates from a 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, enabling the use of tiny, low cost capacitors and inductors 1mm or less in height. Each output voltage is adjustable from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A power switches provide high efficiency without the need for external Schottky diodes.

A user-selectable mode input is provided to allow the user to trade-off ripple noise for low power efficiency. Burst Mode^® operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest ripple noise at light loads.

To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100% duty cycle), and both channels draw a total quiescent current of only 40μA. In shutdown, the device draws <1μA.


	Features
LTC3548A	Improved Burst Mode, Improved ESD, 2 Adjustable Outputs
LTC3548-2	One Fixed 1.8V Output, 1 Adjustable
LTC3548-1	Fixed 1.8V and 1.575V Outputs
LTC3548	2 Adjustable Outputs

Applications

PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Wireless and DSL Modems

Part Models: 8
1ku List Price: Starting From $3.28

Documentation

Data Sheet 1

LTC3548A: Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator Data Sheet 02/18/2010

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
LTC3548AEDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3548AEDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3548AEMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3548AEMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3548AIDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3548AIDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3548AIMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC3548AIMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 18, 2019 - 19_0112 LTC3548A - Die Revision
		PCN19_0112_Form Material_Report Other Qualification Results Summary
LTC3548AEDD#PBF	PRODUCTION
LTC3548AEDD#TRPBF	PRODUCTION
LTC3548AEMSE#PBF	PRODUCTION
LTC3548AEMSE#TRPBF	PRODUCTION
LTC3548AIDD#PBF	PRODUCTION
LTC3548AIDD#TRPBF	PRODUCTION
LTC3548AIMSE#PBF	PRODUCTION
LTC3548AIMSE#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3548AEMSE#PBF	PRODUCTION
LTC3548AEMSE#TRPBF	PRODUCTION
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3548AEMSE#PBF	PRODUCTION
LTC3548AEMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LTC3548AEMSE#PBF	PRODUCTION
LTC3548AEMSE#TRPBF	PRODUCTION
LTC3548AIMSE#PBF	PRODUCTION
LTC3548AIMSE#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3548AIMSE#PBF	PRODUCTION
LTC3548AIMSE#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
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:

LTC3548
LTC3548-1
LTC3548-2
LTC3548A

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.

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