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  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Multiple Output Buck Regulators
  6. LTC3548


Alternative Parts

Overview

Features and Benefits

  • 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 RDS(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: IQ < 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

Product Details

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

LTspice

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.

LTspice

Models for the following parts are available in LTspice:

LTC3548
LTC3548-1
LTC3548-2
LTC3548A

Design Resources

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 Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC3548EDD#PBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LTC3548EDD#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LTC3548EMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LTC3548EMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LTC3548IDD#PBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LTC3548IDD#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 3mm w/ EP)
LTC3548IMSE#PBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
LTC3548IMSE#TRPBF Material Declaration Reliability Data 10-Lead MSOP w/ EP
Wafer Fabrication Data R415 Reliability Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy


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Buy Now Pricing


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List Pricing


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Lead Times


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Sampling


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Price Table Help

 

Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.