LTC3538 - 800mA Synchronous Buck-Boost DC/DC Converter


  • Regulated Output with Input Voltages Above, Below, or Equal to the Output
  • 800mA Continuous Output Current from a Single Lithium-Ion/Polymer Cell
  • Single Inductor
  • 1.8V to 5.25V VOUT Range
  • 2.4V to 5.5V VIN Range
  • 1MHz Fixed Frequency Operation
  • Output Disconnect in Shutdown
  • 2.4V to 5.5V Input
  • 35µA Quiesecent Current in Burst Mode Operation
  • <5µA Shutdown Current
  • Internal Soft-Start
  • Small, Thermally Enhanced 8-Lead (2mm x 3mm) DFN package

Typical Application

LTC3538 Typical Application
LTC3538 Typical Application


The LTC3538 is a highly efficient, low noise, buck-boost DC/DC converter that operates from input voltages above, below, and equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single Lithium Ion or multicell Alkaline or NiMH applications where the output voltage is within the battery voltage range.

The LTC3538 is suited for use in Micro Hard Disk Drive (µHDD) applications with its 800mA current capability. Burst Mode operation provides high efficiency at light loads. The LTC3538 includes two 0.17Ω N-channel and two 0.2Ω P-channel MOSFET switches. Operating frequency is internally set to 1MHz to minimize solution footprint while maximizing efficiency.

Other features include <5µA shutdown current, internal soft-start, short circuit protection and thermal shutdown. The LTC3538 is available in a low profile (0.75mm), thermally enhanced 8-lead (2mm x 3mm) DFN package.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC3538EDCB#PBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LTC3538EDCB#TRMPBF 2x3 DFN-8 DCB E 05-08-1718 Yes
LTC3538EDCB#TRPBF 2x3 DFN-8 DCB E 05-08-1718 Yes

LTC3538 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC3538EDCB#PBF 2x3 DFN-8 E $3.64 Yes
LTC3538EDCB#TRMPBF 2x3 DFN-8 E $3.64 $2.60 Yes
LTC3538EDCB#TRPBF 2x3 DFN-8 E $3.64 $2.55 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1095A LTC3538EDCB Demo Board | Buck-Boost, 2.4V ≤ VIN ≤ 5.5V, Vout = 3.3V @ 0.8A $75.00
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Click here to view our complete list of demo boards


  • Miniature Hard Disk Drives
  • MP3 Players
  • Digital Cameras
  • Cellular Handsets
  • PDAs, Handheld PC
  • GPS Receivers

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