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
AEC-Q100 data available for specific packages
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
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 |
|---|---|---|---|---|---|
| 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 |
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 Now • Request Samples | ||||||
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 | |||
Designed for Automotive and Transportation Applications
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 Now • Request Samples | ||||||
Applications
- Automotive ECU/CAN Transceiver Supplies
- Industrial Housekeeping Supplies
- Low Power 12V to 5V Conversion
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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:
LTC3245
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
