LTC3548

PRODUCTION

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

Part Models: 8
1ku List Price: Starting From $3.14

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Part Details

High Efficiency: Up to 95%
Very Low Quiescent Current: Only 40μA
Low Output Ripple Burst Mode^® Operation
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
Small Thermally Enhanced MSOP and 3mm × 3mm DFN Packages

The LTC3548 is a dual, constant frequency, synchronous step down DC/DC converter. Intended for low power applications, it operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency, allowing the use of tiny, low cost capacitors and inductors with a profile ≤1mm. 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 noise ripple for low power efficiency. Burst Mode operation provides high efficiency at light loads, while Pulse-Skipping Mode provides low noise ripple at light loads.

To further maximize battery runtime, 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
Portable Media Players
PC Cards
Wireless and DSL Modems

Part Models: 8
1ku List Price: Starting From $3.14

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
LTC3548EDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548EDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548EMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548EMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548IDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548IDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548IMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3548IMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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
LTC3548EMSE#PBF	PRODUCTION
LTC3548EMSE#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
LTC3548EMSE#PBF	PRODUCTION
LTC3548EMSE#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
LTC3548EMSE#PBF	PRODUCTION
LTC3548EMSE#TRPBF	PRODUCTION
LTC3548IMSE#PBF	PRODUCTION
LTC3548IMSE#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
LTC3548IMSE#PBF	PRODUCTION
LTC3548IMSE#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
LTC3548A	PRODUCTION	Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

Tools & Simulations

LTspice 2

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.

Evaluation Kits

LTC3548EDD Demo Board | 2.5V ≤ VIN ≤ 5.5V, VOUT1 = 1.2V1.5V/1.8V @ 800mA, VOUT2 = 2.5V @ 400mA

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Product Details

Demonstration circuit DC822 is a Dual Channel Synchronous, 2.25MHz Step-Down DC/DC Regulator featuring the LTC3548. The DC822 has an input voltage range of 2.5V to 5.5V. The jumper-selectable 1.2V/1.5V/1.8V output is capable of delivering up to 800mA of current. The 2.5V output is capable of delivering up to 400mA of output current.

Resources

DC822A - Design File
9/24/2009

DC822A - Demo Manual
9/24/2009

DC822A - Schematic
9/24/2009

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LTC3548

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Press Release 1