LTC3115-2 - 40V, 2A Synchronous Buck-Boost DC/DC Converter

Features

  • Wide VIN Range: 2.7V to 40V
  • Wide VOUT Range: 2.7V to 40V
  • 0.8A Output Current for VIN ≥ 3.6V, VOUT = 5V
  • 2A Output Current in Step-Down Operation for VIN ≥ 6V
  • Programmable Frequency: 100kHz to 2MHz
  • Synchronizable Up to 2MHz with an External Clock
  • Up to 95% Efficiency
  • 30μA No-Load Quiescent Current in Burst Mode® Operation
  • Ultralow Noise Buck-Boost PWM
  • Internal Soft-Start
  • 3μA Supply Current in Shutdown
  • Programmable Input Undervoltage Lockout
  • Small 4mm × 5mm × 0.75mm DFN Package
  • Thermally Enhanced 20-Lead TSSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LTC3115-2 Typical Application
LTC3115-2 Typical Application

Description

The LTC®3115-2 is a high voltage monolithic synchronous buck-boost DC/DC converter optimized for applications subject to fast (<1ms) input voltage transients. For all other applications, the LTC3115-1 is recommended. With its wide 2.7V to 40V input and output voltage ranges, the LTC3115-2 is well suited for use in a wide variety of automotive and industrial power supplies. A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes.

Programmable frequency PWM mode operation provides low noise, high efficiency operation and the ability to synchronize switching to an external clock. Switching frequencies up to 2MHz are supported to allow use of small value inductors for miniaturization of the application circuit. Pin selectable Burst Mode operation reduces standby current and improves light load efficiency which, combined with a 3μA shutdown current, make the LTC3115-2 ideally suited for battery-powered applications. Additional features include output disconnect in shutdown, short-circuit protection and internal soft-start. The LTC3115-2 is available in thermally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and 20‑lead TSSOP packages.

  Features
LTC3115-1 -
LTC3115-2 Optimized for applications
subject to fast (<1ms) input voltage transients

Packaging

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
Drawing
RoHS
LTC3115EDHD-2#PBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LTC3115EDHD-2#TRPBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LTC3115EFE-2#PBF TSSOP-20 FE E 05-08-1663 (CA) Yes
LTC3115EFE-2#TRPBF TSSOP-20 FE E 05-08-1663 (CA) Yes
LTC3115HFE-2#PBF TSSOP-20 FE H 05-08-1663 (CA) Yes
LTC3115HFE-2#TRPBF TSSOP-20 FE H 05-08-1663 (CA) Yes
LTC3115IDHD-2#PBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC3115IDHD-2#TRPBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC3115IFE-2#PBF TSSOP-20 FE I 05-08-1663 (CA) Yes
LTC3115IFE-2#TRPBF TSSOP-20 FE I 05-08-1663 (CA) Yes
LTC3115MPFE-2#PBF TSSOP-20 FE MP 05-08-1663 (CA) Yes
LTC3115MPFE-2#TRPBF TSSOP-20 FE MP 05-08-1663 (CA) Yes


LTC3115-2 Package Drawing
LTC3115-2 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
(1-99)
Price
(1k)*
RoHS
LTC3115EDHD-2#PBF 5x4 DFN-16 E $7.64 $5.35 Yes
LTC3115EDHD-2#TRPBF 5x4 DFN-16 E $5.41 Yes
LTC3115EFE-2#PBF TSSOP-20 E $7.93 $5.55 Yes
LTC3115EFE-2#TRPBF TSSOP-20 E $5.61 Yes
LTC3115HFE-2#PBF TSSOP-20 H $9.09 $6.36 Yes
LTC3115HFE-2#TRPBF TSSOP-20 H $6.42 Yes
LTC3115IDHD-2#PBF 5x4 DFN-16 I $8.42 $5.89 Yes
LTC3115IDHD-2#TRPBF 5x4 DFN-16 I $5.95 Yes
LTC3115IFE-2#PBF TSSOP-20 I $8.73 $6.11 Yes
LTC3115IFE-2#TRPBF TSSOP-20 I $6.17 Yes
LTC3115MPFE-2#PBF TSSOP-20 MP $23.54 $16.48 Yes
LTC3115MPFE-2#TRPBF TSSOP-20 MP $16.54 Yes
Buy NowRequest Samples
* 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
DC2119A LTC3115EDHD-2 Demo Board | 2.7V to 40VIN, 5VOUT @ 2A $225.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3115IDHD-2#PBF 5x4 DFN-16 I $8.42 $5.89 Yes
LTC3115IDHD-2#TRPBF 5x4 DFN-16 I $5.95 Yes
Buy NowRequest Samples
* 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.

Applications

  • 24V/28V Industrial Applications
  • Automotive Power Systems
  • Telecom, Servers and Networking Equipment
  • FireWire Regulator
  • Multiple Power Source Supplies

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC3115-1
LTC3115-2

Technical Support