LTC1265 - 1.2A, High Efficiency Step-Down DC/DC Converter
Features
- High Efficiency: Up to 95%
- Current Mode Operation for Excellent Line and Load Transient Response
- Internal 0.3 Ohms Power Switch (VIN = 10V)
- Short-Circuit Protection
- Low Dropout Operation: 100% Duty Cycle
- Low-Battery Detector
- Low 160µA Standby Current at Light Loads
- Active-High Micropower Shutdown: IQ < 15µA
- Peak Inductor Current Independent of Inductor Value
- Available in 14-pin SO Package
Typical Application
Description
The LTC1265 is a monolithic step-down current mode DC/DC converter featuring Burst Mode operation at low output current. The LTC1265 incorporates a 0.3 Ohms switch (VIN =10V) allowing up to 1.2A of output current.Under no load condition, the converter draws only 160µA. In shutdown it typically draws a mere 5µA making this converter ideal for current sensitive applications. In dropout the internal P-channel MOSFET switch is turned on continuously maximizing the life of the battery source. The LTC1265 incorporates automatic power saving Burst Mode operation to reduce gate charge losses when the load currents drop below the level required for continuous operation.The inductor current is user-programmable via an external current sense resistor. Operation up to 700kHz permits the use of small surface mount inductors and capacitors.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 |
|---|---|---|---|---|---|
| LTC1265CS-3.3#PBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1265CS-3.3#TRPBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1265CS-5#PBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1265CS-5#TRPBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1265CS#PBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1265CS#TRPBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1265IS#PBF | SO-14 | S | I | 05-08-1610 (S14) | Yes |
| LTC1265IS#TRPBF | SO-14 | S | I | 05-08-1610 (S14) | 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 | |
|---|---|---|---|---|---|---|
| LTC1265CS-3.3#PBF | SO-14 | C | $4.60 | $3.75 | Yes | |
| LTC1265CS-3.3#TRPBF | SO-14 | C | $3.81 | Yes | ||
| LTC1265CS-5#PBF | SO-14 | C | $4.60 | $3.75 | Yes | |
| LTC1265CS-5#TRPBF | SO-14 | C | $3.81 | Yes | ||
| LTC1265CS#PBF | SO-14 | C | $4.60 | $3.75 | Yes | |
| LTC1265CS#TRPBF | SO-14 | C | $3.81 | Yes | ||
| LTC1265IS#PBF | SO-14 | I | $5.15 | $4.25 | Yes | |
| LTC1265IS#TRPBF | SO-14 | I | $4.31 | 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 |
|---|---|---|---|
| DC074A-A | LTC1265CS | HIGH EFFICIENCY SWITCHING REGULATOR, 2.5V@1A | Contact Factory | |
| DC074A-B | LTC1265CS | HIGH EFFICIENCY SWITCHING REGULATOR, 3.3V@1A | Contact Factory | |
| DC074A-C | LTC1265CS | HIGH EFFICIENCY SWITCHING REGULATOR, 5V@1A | Contact Factory | |
| Buy Now | |||
Applications
- 5V to 3.3V Conversion
- Distributed Power Systems
- Step-Down Converters
- Inverting Converters
- Memory Backup Supply
- Portable Instruments
- Battery-Powered Equipment
- Cellular Telephones
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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:
LTC1265
LTC1265-3.3
LTC1265-5
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.
