LT1680 - High Power DC/DC Step-Up Controller
Features
- High Voltage: Operation Up to 60V
- High Current: N-Channel Drive Handles Up to 10,000pF Gate Capacitance
- Programmable Average Current Limiting
- 5V Reference Output with 10mA External Loading Capability
- Fixed Frequency Current Mode Operation
- Oscillator Synchronizable Up to 200kHz
- Undervoltage Lockout with Hysteresis
- Programmable Start Inhibit for Power Supply Sequencing and Protection
- User Adjustable Slope Compensation
Typical Application
Description
The LT1680 is a high power, current mode switching power supply controller optimized for boost topologies. The IC drives an N-channel MOSFET switch for DC/DC converter applications up to 60V input. A high current gate drive output handles up to 10,000pF gate capacitance, enabling the construction of high power DC/DC converters. Current sense common mode range up to 60V allows current sensing to be referenced to the input supply, eliminating the need for sense blanking circuits.The LT1680 incorporates programmable average current limiting allowing accurate limiting of DC current in the magnetics, independent of ripple current. User adjustable slope compensation provides stable operation at duty cycles up to 90%.
The LT1680 operating frequency is programmable and can be synchronized up to 200kHz. Minimum off-time operation provides switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions.
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 |
|---|---|---|---|---|---|
| LT1680CN#PBF | N-16 | N | C | 05-08-1510 (N16) | Yes |
| LT1680CSW#PBF | SW-16 | SW | C | 05-08-1620 (SW16) | Yes |
| LT1680CSW#TRPBF | SW-16 | SW | C | 05-08-1620 (SW16) | Yes |
| LT1680IN#PBF | N-16 | N | I | 05-08-1510 (N16) | Yes |
| LT1680ISW#PBF | SW-16 | SW | I | 05-08-1620 (SW16) | Yes |
| LT1680ISW#TRPBF | SW-16 | SW | I | 05-08-1620 (SW16) | 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 | |
|---|---|---|---|---|---|---|
| LT1680CN#PBF | N-16 | C | $4.90 | $4.00 | Yes | |
| LT1680CSW#PBF | SW-16 | C | $5.15 | $4.20 | Yes | |
| LT1680CSW#TRPBF | SW-16 | C | $4.26 | Yes | ||
| LT1680IN#PBF | N-16 | I | $5.90 | $4.80 | Yes | |
| LT1680ISW#PBF | SW-16 | I | $6.15 | $5.00 | Yes | |
| LT1680ISW#TRPBF | SW-16 | I | $5.06 | 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
- High Power Single Board Systems
- Distributed Power Converters
- Industrial Control Systems
- Lead-Acid Battery Back-Up Systems
- 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:
LT1680
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.
