LT1424-5 - Isolated Flyback Switching Regulator with 5V Output
Features
- No Transformer “Third Winding” or Optoisolator Required
- Designed for Use with 1:1 Ratio Transformers
- Fixed, Application Specific 5V Output Voltage
- Regulation Maintained Well into Discontinuous Mode (Light Load)
- Load Compensation Provides Excellent Load Regulation
- Available in 8-Pin PDIP and SO Packages
- Operating Frequency: 285kHz
Typical Application
Description
The LT®1424-5 is a monolithic high power switching regulator specifically designed for the isolated flyback topology. No “third winding” or optoisolator is required; the integrated circuit senses the isolated output voltage directly from the primary side flyback waveform. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry.
The LT1424-5 operates with input supply voltages from 3V to 20V and draws only 7mA quiescent current. It can deliver up to 400mA at 5V with no external power devices. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation.
The LT1424-5 has a number of features not found on other switching regulator ICs. Its unique control circuitry can maintain regulation well into discontinuous mode. Load compensation circuitry allows for improved load regulation. An externally activated shutdown mode reduces total supply current to 20mA typical for standby operation.
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 |
|---|---|---|---|---|---|
| LT1424CN8-5#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1424CS8-5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1424CS8-5#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1424IN8-5#PBF | N-8 | N | I | 05-08-1510 (N8) | Yes |
| LT1424IS8-5#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1424IS8-5#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | 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 | |
|---|---|---|---|---|---|---|
| LT1424CN8-5#PBF | N-8 | C | $3.35 | $2.90 | Yes | |
| LT1424CS8-5#PBF | SO-8 | C | $3.50 | $3.05 | Yes | |
| LT1424CS8-5#TRPBF | SO-8 | C | $3.11 | Yes | ||
| LT1424IN8-5#PBF | N-8 | I | $4.70 | $3.95 | Yes | |
| LT1424IS8-5#PBF | SO-8 | I | $4.85 | $4.05 | Yes | |
| LT1424IS8-5#TRPBF | SO-8 | I | $4.11 | 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
- Isolated Communication Supplies
- Industrial Automation
- Instrumentation 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:
LT1424-5
LT1424-9
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.
