LTC3112 - 15V, 2.5A Synchronous Buck-Boost DC/DC Converter

Features

  • Regulated Output with VIN Above, Below or Equal to VOUT
  • 2.7V to 15V Input Voltage Range
  • 2.5V to 14V Output Voltage Range
  • 2.5A Continuous Output Current: VIN ≥ 5V, VOUT = 5V, PWM Mode
  • Output Current Monitor
  • Up to 95% Efficiency
  • 750kHz Switching Frequency, Synchronizable Between 300kHz and 1.5MHz
  • Internal N-Channel MOSFETs
  • Selectable Burst Mode® Operation, IQ = 50μA
  • Shutdown Current < 1μA
  • Overvoltage Protection
  • Output Disconnect in Shutdown
  • Internal Soft-Start
  • Small, Thermally Enhanced 16-Lead (4mm × 5mm × 0.75mm) DFN and 20-Lead TSSOP Package

Typical Application

LTC3112 Typical Application
LTC3112 Typical Application

Description

The LTC®3112 is a fixed frequency synchronous buck-boost DC/DC converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below or equal to the output voltage.

With an input range of 2.7V to 15V, the LTC3112 is wellsuited for a wide variety of single or multiple cell battery, backup capacitor or wall adapter source applications. Low RDS(ON) internal N-Channel MOSFET switches provide highly efficient operation in applications with higher load current requirements.

The LTC3112 features selectable PWM or Burst Mode operation, an easily synchronized oscillator and output disconnect in shutdown. An output current monitor circuit allows the load current to be controlled or measured. Other features include <1μA shutdown current, short circuit protection, soft-start, current limit and thermal shutdown.

The LTC3112 is offered in both a 16-pin (4mm × 5mm × 0.75mm) DFN and 20-pin TSSOP packages.

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
LTC3112EDHD#PBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LTC3112EDHD#TRPBF 5x4 DFN-16 DHD E 05-08-1707 Yes
LTC3112EFE#PBF TSSOP-20 FE E 05-08-1663 (CA) Yes
LTC3112EFE#TRPBF TSSOP-20 FE E 05-08-1663 (CA) Yes
LTC3112HDHD#PBF 5x4 DFN-16 DHD H 05-08-1707 Yes
LTC3112HDHD#TRPBF 5x4 DFN-16 DHD H 05-08-1707 Yes
LTC3112HFE#PBF TSSOP-20 FE H 05-08-1663 (CA) Yes
LTC3112HFE#TRPBF TSSOP-20 FE H 05-08-1663 (CA) Yes
LTC3112IDHD#PBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC3112IDHD#TRPBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC3112IFE#PBF TSSOP-20 FE I 05-08-1663 (CA) Yes
LTC3112IFE#TRPBF TSSOP-20 FE I 05-08-1663 (CA) Yes
LTC3112MPDHD#PBF 5x4 DFN-16 DHD MP 05-08-1707 Yes
LTC3112MPDHD#TRPBF 5x4 DFN-16 DHD MP 05-08-1707 Yes
LTC3112MPFE#PBF TSSOP-20 FE MP 05-08-1663 (CA) Yes
LTC3112MPFE#TRPBF TSSOP-20 FE MP 05-08-1663 (CA) Yes


LTC3112 Package Drawing
LTC3112 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
LTC3112EDHD#PBF 5x4 DFN-16 E $5.71 $4.00 Yes
LTC3112EDHD#TRPBF 5x4 DFN-16 E $4.06 Yes
LTC3112EFE#PBF TSSOP-20 E $5.93 $4.15 Yes
LTC3112EFE#TRPBF TSSOP-20 E $4.21 Yes
LTC3112HDHD#PBF 5x4 DFN-16 H $6.64 $4.65 Yes
LTC3112HDHD#TRPBF 5x4 DFN-16 H $4.71 Yes
LTC3112HFE#PBF TSSOP-20 H $6.89 $4.82 Yes
LTC3112HFE#TRPBF TSSOP-20 H $4.88 Yes
LTC3112IDHD#PBF 5x4 DFN-16 I $6.29 $4.40 Yes
LTC3112IDHD#TRPBF 5x4 DFN-16 I $4.46 Yes
LTC3112IFE#PBF TSSOP-20 I $6.53 $4.57 Yes
LTC3112IFE#TRPBF TSSOP-20 I $4.63 Yes
LTC3112MPDHD#PBF 5x4 DFN-16 MP $16.97 $11.88 Yes
LTC3112MPDHD#TRPBF 5x4 DFN-16 MP $11.94 Yes
LTC3112MPFE#PBF TSSOP-20 MP $17.62 $12.33 Yes
LTC3112MPFE#TRPBF TSSOP-20 MP $12.39 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
DC1598A LTC3112EDHD Demo Board $150.00
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Click here to view our complete list of demo boards

Applications

  • 3.3V or 5V from 1, 2 or 3 Li-Ion, Backup Capacitor Stack
  • Hand Held Inventory Terminals
  • RF Transmitters
  • 12V Synchronous Boost Converter
  • Multiple Power Input Systems
  • LED Lighting with Current Regulation
  • 12V Lead Acid Battery to 12V

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Design Tools

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LTC3112

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