LTC1574 - High Efficiency Step-Down DC/DC Converters with Internal Schottky Diode
Features
- High Efficiency: Up to 94%
- Usable in Noise-Sensitive Products
- Peak Inductor Current Independent of Inductor Value
- Short-Circuit Protection
- Internal Low Forward Drop Schottky Diode
- Only Three External Components Required
- Wide VIN Range: 4V to 18.5V (Absolute Maximum)
- Low Dropout Operation
- Low-Battery Detector
- Pin Selectable Current Limit
- Internal 0.9 Ohms Power Switch: VIN < 11V
- Standby Current: 130µA
- Active Low Micropower Shutdown
Typical Application
Description
The LTC1574 is a family of easy-to-use current mode DC/DC converters ideally suited for 9V to 5V, 5V to 3.3V and inverting operation. With an internal 0.9 Ohms switch (at a supply voltage of 12V) and a low forward drop Schottky diode. (0.45V typ at 200mA, TA=25°C), the LTC1574 requires only three external components to construct a complete high efficiency DC/DC converter. Under no load condition the LTC1574 draws only 130µA. In shutdown, it draws a mere 2µA making this converter ideal for battery-powered applications. In dropout, the internal P-channel MOSFET switch is turned on continuously allowing the user to maximize the life of the battery source. The maximum inductor current of the LTC1574 family is pin selectable to either 340mA or 600mA, optimizing efficiency for a wide range of applications. Operation up to 200kHz permits the use of small surface mount inductors and capacitors. For applications requiring higher output current or ultrahigh efficiency, see the LTC1148 or LTC1265 data sheets. For detailed applications information, see the LTC1174 data sheet.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 |
|---|---|---|---|---|---|
| LTC1574CS-3.3#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1574CS-3.3#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1574CS-5#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1574CS-5#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1574CS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1574CS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1574CS-3.3#PBF | SO-16 | C | $5.65 | $4.65 | Yes | |
| LTC1574CS-3.3#TRPBF | SO-16 | C | $4.71 | Yes | ||
| LTC1574CS-5#PBF | SO-16 | C | $5.65 | $4.65 | Yes | |
| LTC1574CS-5#TRPBF | SO-16 | C | $4.71 | Yes | ||
| LTC1574CS#PBF | SO-16 | C | $5.65 | $4.65 | Yes | |
| LTC1574CS#TRPBF | SO-16 | C | $4.71 | 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.Click here to view our complete list of demo boards
Applications
- Inverting Converters
- Step-Down Converters
- Memory Backup Supply
- Portable Instruments
- Battery-Powered Equipment
- Distributed Power Systems
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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:
LTC1574
LTC1574-3.3
LTC1574-5
LTC1574HV
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.
