LTC3245 - Wide VIN Range, Low Noise, 250mA Buck-Boost Charge Pump

Features

  • 2.7V to 38V VIN Range 
  • IQ = 18μA Operating; 4μA in Shutdown 
  • 12V to 5V Efficiency = 81% 
  • Multimode Operation (2:1, 1:1, 1:2) with Automatic  Mode Switching 
  • Low Noise, Constant Frequency Operation 
  • Pin Selectable Burst Mode ® Operation 
  • VOUT: Fixed 3.3V, 5V or Adjustable (2.5V to 5V) 
  • IOUT Up to 250mA 
  • Overtemperature and Short-Circuit Protection 
  • Operating Junction Temperature: 150°C Maximum 
  • Thermally Enhanced 12-Pin MSOP and Low Profile
    12-Pin (3mm x 4mm) DFN Packages
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3245 Typical Application
LTC3245 Typical Application

Description

The LTC3245 is a switched capacitor buck-boost DC/DC converter that produces a regulated output (3.3V, 5V or adjustable) from a 2.7V to 38V input. The device uses switched capacitor fractional conversion to maintain regulation over a wide range of input voltage. Internal circuitry automatically selects the conversion ratio to optimize efficiency as input voltage and load conditions vary. No inductors are required.

The unique constant frequency architecture provides a lower noise output than conventional charge pump regulators. To optimize efficiency at the expense of slightly higher output ripple, the device has pin selectable Burst Mode operation.

Low operating current (20μA with no load, 4μA in shutdown) and low external parts count (three small ceramic capacitors) make the LTC3245 ideally suited for low power, space constrained automotive/industrial applications. The device is short-circuit and overtemperature protected, and is available in thermally enhanced 12-pin MSOP and low profile 3mm x 4mm 12-pin DFN packages.

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LTC3245EDE#PBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes
LTC3245EDE#TRPBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes
LTC3245EMSE#PBF MS-12E MSE E 05-08-1666 Yes
LTC3245EMSE#TRPBF MS-12E MSE E 05-08-1666 Yes
LTC3245HMSE#PBF MS-12E MSE H 05-08-1666 Yes
LTC3245HMSE#TRPBF MS-12E MSE H 05-08-1666 Yes
LTC3245IDE#PBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LTC3245IDE#TRPBF 4x3 DFN-12 DE/UE I 05-08-1695 Yes
LTC3245IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LTC3245IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes
LTC3245MPMSE#PBF MS-12E MSE MP 05-08-1666 Yes
LTC3245MPMSE#TRPBF MS-12E MSE MP 05-08-1666 Yes


LTC3245 Package Drawing
LTC3245 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
LTC3245EDE#PBF 4x3 DFN-12 E $4.00 $2.80 Yes
LTC3245EDE#TRPBF 4x3 DFN-12 E $2.86 Yes
LTC3245EMSE#PBF MS-12E E $4.00 $2.80 Yes
LTC3245EMSE#TRPBF MS-12E E $2.86 Yes
LTC3245HMSE#PBF MS-12E H $4.93 $3.45 Yes
LTC3245HMSE#TRPBF MS-12E H $3.51 Yes
LTC3245IDE#PBF 4x3 DFN-12 I $4.50 $3.15 Yes
LTC3245IDE#TRPBF 4x3 DFN-12 I $3.21 Yes
LTC3245IMSE#PBF MS-12E I $4.50 $3.15 Yes
LTC3245IMSE#TRPBF MS-12E I $3.21 Yes
LTC3245MPMSE#PBF MS-12E MP $10.79 $7.55 Yes
LTC3245MPMSE#TRPBF MS-12E MP $7.61 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
DC1802A LTC3245EMSE Demo Board | Buck-Boost Charge Pump, 2.7V ≤ VIN ≤ 38V, Vout = 1.2V/3.3V/5V @ 250mA $100.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Appications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports 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
LTC3245HMSE#PBF MS-12E H $4.93 $3.45 Yes
LTC3245HMSE#TRPBF MS-12E H $3.51 Yes
LTC3245IMSE#PBF MS-12E I $4.50 $3.15 Yes
LTC3245IMSE#TRPBF MS-12E I $3.21 Yes
LTC3245MPMSE#PBF MS-12E MP $10.79 $7.55 Yes
LTC3245MPMSE#TRPBF MS-12E MP $7.61 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

  • Automotive ECU/CAN Transceiver Supplies
  • Industrial Housekeeping Supplies
  • Low Power 12V to 5V Conversion

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Design Tools

LTspiceIV

LTspice® IV 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 IV

Models for the following parts are available in LTspice IV:
LTC3245

Technical Support