LTC3901 - Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters
Features
- N-Channel Synchronous MOSFET Driver
- Programmable Timeout
- Reverse Inductor Current Sense
- Gate Drive Transformer Synchronization Sequence Monitor
- Wide VCC Supply Range: 4.5V to 11V
- 15ns Rise/Fall Times at VCC = 5V, CL = 4700pF
- Undervoltage Lockout
- Small 16-Lead SSOP Package
Typical Application
Description
The LTC3901 is a secondary side synchronous rectifier driver designed to be used in isolated push-pull and full-bridge converter power supplies. The chip drives two external N-channel MOSFETs and accepts a transformer generated bipolar input to maintain synchronization with the primary side controller.
The LTC3901 provides a full range of protection features for the external MOSFETs. A programmable timeout function is included that disables both drivers when the synchronization signal is missing or incorrect. Additionally, the chip senses the output inductor current through the drain-source resistance of the two MOSFETs, turning off the MOSFETs if the inductor current reverses. The LTC3901 also shuts off the drivers if the supply is low or if the synchronization sequence is incorrect.
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 |
|---|---|---|---|---|---|
| LTC3901EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3901EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC3901EGN#PBF | SSOP-16 | E | $3.75 | $2.60 | Yes | |
| LTC3901EGN#TRPBF | SSOP-16 | E | $2.66 | 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
- 48V Input Isolated DC/DC Converters
- Isolated Telecom Power Supplies
- Distributed Power Step-Down Converters
- Industrial Control System Power Supplies
- Automotive and Heavy Equipment
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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:
LTC3901
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.
