LTC3546
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LTC3546

Dual Synchronous, 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator

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LTspice LTC3546 Demo Circuit - Dual Synchronous Step-Down (2.5-5.5V to 2.5V @ 2A & 1.8V @ 2A) Download 4.00KB LTspice LTC3546 - Step-Down (Buck) Regulators Download 3.33 KB
Part Models 8
1ku List Price Starting From $4.48
Features
  • VIN Range: 2.25V to 5.5V
  • VOUT Range: 0.6V to 5V
  • Programmable Frequency Operation; 2.25MHz, or Adjustable Between 0.75MHz to 4MHz
  • Low RDS(ON) Internal Switches
  • High Efficiency: Up to 96%
  • No Schottky Diodes Required
  • Short-Circuit Protected
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Low Ripple Burst Mode Operation (30mVP-P), IQ = 160μA
  • Ultralow Shutdown Current: IQ < 1μA
  • Low Dropout Operation: 100% Duty Cycle
  • Power Good Output For Each Channel
  • Externally or Internally Programmable Burst Level
  • External or Internal Soft-Start or Supply Tracking
  • Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages
Additional Details
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The LTC3546 is a dual, constant-frequency, synchronous step down DC/DC converter for medium power applications. The design consists of 2A and 1A primary output switches. In addition to the 2A/1A capability, a 1A dependant output switch can be externally connected to either of the primary outputs to produce 3A/1A dual regulator or 2A/2A dual regulator configurations.

Supply operation is from 2.25V to 5.5V. The switching frequency can be set to 2.25MHz, adjustable from 0.75MHz to 4MHz, or synchronized to an external clock. Each output is adjustable from 0.6V to 5V and has output tracking on power-up. Internal synchronous low RDS(ON) power switches provide high efficiency without external Schottky diodes.

User-selectable modes (Burst Mode® operation, pulse skipping and forced continuous) allow a trade-off between ripple noise and power efficiency. Burst Mode operation provides high efficiency at light loads. Pulse-skipping mode provides low ripple noise at light loads.

The device is capable of low dropout configurations and both channels can operate at 100% duty cycle. In shutdown, the device draws <1μA.

Applications

  • Netbooks/Ultra-Mobile PCs
  • PC Cards
  • Wireless and DSL Modems
  • Point of Load DC/DC Conversion
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file View Data Sheet
Documentation View All Documentation
LTspice LTC3546 Demo Circuit - Dual Synchronous Step-Down (2.5-5.5V to 2.5V @ 2A & 1.8V @ 2A) Download 4.00KB LTspice LTC3546 - Step-Down (Buck) Regulators Download 3.33 KB
Part Models 8
1ku List Price Starting From $4.48
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LTC3546

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Data Sheet

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UPDATED 03/12/2013
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LTC3546: Dual Synchronous, 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator Data Sheet

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UPDATED 05/24/2013
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LTC3546: 3A/1Aまたは2A/2Aに設定可能なデュアル同期整流式降圧DC/DCレギュレータ データシート

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UPDATED 09/24/2009
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DC1086A - Demo Manual redirect icon

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UPDATED 09/24/2009
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DC1087A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/23/2018
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Design Note

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UPDATED 03/01/2009
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Design Note 460: Dual Output Buck Regulator with Current Partitioning Optimizes Efficiency in Space-Sensitive Applications redirect icon

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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
LTC3546EFE#PBF 28-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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LTC3546EFE#TRPBF 28-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3546EUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3546EUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3546IFE#PBF 28-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3546IFE#TRPBF 28-Lead TSSOP w/ EP external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3546IUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3546IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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Apr 6, 2022

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3546EFE#PBF

PRODUCTION

LTC3546EFE#TRPBF

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LTC3546IFE#PBF

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3546EFE#PBF

PRODUCTION

LTC3546EFE#TRPBF

PRODUCTION

LTC3546IFE#PBF

PRODUCTION

LTC3546IFE#TRPBF

PRODUCTION

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PCN22_0068_Form

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Material_Report

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Delta Qualification Matrix

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Software & Part Ecosystem

Parts Product Life Cycle Description

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Evaluation Kits 2

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DC1087A

LTC3546UFD Demo Board | Dual Synchronous 3A/1A or 2A/2A, Configurable Step Down DC/DC Regulator

reference details image

DC1086A

LTC3546UFD Demo Board | Dual Synchronous 2+1A or 2A 1+1A, 4MHz Step Down DC/DC Regulator

Evaluation Kits2

evaluation kit item images

DC1087A

LTC3546UFD Demo Board | Dual Synchronous 3A/1A or 2A/2A, Configurable Step Down DC/DC Regulator
evaluation kit item images

DC1086A

LTC3546UFD Demo Board | Dual Synchronous 2+1A or 2A 1+1A, 4MHz Step Down DC/DC Regulator

Tools & Simulations 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.

spice tool Lt Spice

LTC3546 Demo Circuit - Dual Synchronous Step-Down (2.5-5.5V to 2.5V @ 2A & 1.8V @ 2A) Download

4.00K

spice tool Lt Spice

LTC3546 - Step-Down (Buck) Regulators Download

3.33 K

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