LTC3100 - 1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO


  • Extremely Compact Triple-Rail Solution
  • Burst Mode® Operation, IQ = 15μA
  • 1.5MHz Fixed Frequency Operation
  • Power Good Indicators
  • 700mA Synchronous Step-Up DC/DC
    0.65V to 5V VIN Range
    1.5V to 5.25V VOUT Range
    94% Peak Efficiency
    VIN > VOUT Operation
    Output Disconnect
  • 250mA Synchronous Step-Down DC/DC
    1.8V to 5.5V VIN Range
    0.6V to 5.5V VOUT Range
  • LDO (VIN Internally Tied to VBST)
    0.6V to 5.25V VOUT Range
    200mV Dropout Voltage at 100mA
  • Available in a 16-Lead 3mm × 3mm QFN Package

Typical Application

LTC3100 Typical Application
LTC3100 Typical Application


The LTC®3100 combines a high efficiency 700mA synchronous step-up converter, a 250mA synchronous stepdown converter and a 100mA LDO regulator. The LTC3100 features a wide input voltage range of 0.65V to 5V. The step-down converter can be powered by the output of the step-up converter or from a separate power source between 1.8V and 5.5V. The LDO can also be used as a sequencing switch on the output of the boost.

A switching frequency of 1.5MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The switching regulators use current mode control and are internally compensated, reducing external parts count. Each converter automatically transitions to Burst Mode operation to maintain high efficiency over the full load range. Burst Mode operation can be disabled for low noise applications. The integrated LDO provides a third low noise, low dropout supply.

Anti-ringing circuitry reduces EMI by damping the boost inductor in discontinuous mode. Additional features include shutdown current of under 1μA and overtemperature shutdown. The LTC3100 is housed in a 16-lead 3mm × 3mm 0.75mm QFN 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
LTC3100EUD#PBF 3x3 QFN-16 UD E 05-08-1691 Yes
LTC3100EUD#TRPBF 3x3 QFN-16 UD E 05-08-1691 Yes

LTC3100 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
LTC3100EUD#PBF 3x3 QFN-16 E $4.43 $3.10 Yes
LTC3100EUD#TRPBF 3x3 QFN-16 E $3.16 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
DC1326A LTC3100EUD Demo Board | 1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO $100.00
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Click here to view our complete list of demo boards


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