LTC3813 - 100V Current Mode Synchronous Step-Up Controller
Features
- High Output Voltages: Up to 100V
- Large 1Ω Gate Drivers
- No Current Sense Resistor Required
- Dual N-Channel MOSFET Synchronous Drive
- ±0.5% 0.8V Voltage Reference
- Fast Transient Response
- Programmable Soft-Start
- Generates 10V Driver Supply from Input Supply
- Synchronizable to External Clock
- Power Good Output Voltage Monitor
- Adjustable Off-Time/Frequency: tOFF(MIN) < 100ns
- Adjustable Cycle-by-Cycle Current Limit
- Programmable Undervoltage Lockout
- Output Overvoltage Protection
- 28-Pin SSOP Package
Typical Application
Description
The LTC3813 is a synchronous step-up switching regulator controller that can generate output voltages up to 100V. The LTC3813 uses a constant off-time peak current control architecture with accurate cycle-by-cycle current limit, without requiring a sense resistor.
A precise internal reference provides ±0.5% DC accuracy. A high bandwidth (25MHz) error amplifier provides very fast line and load transient response. Large 1Ω gate drivers allow the LTC3813 to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. A shutdown pin allows the LTC3813 to be turned off, reducing the supply current to 240µA.
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 |
|---|---|---|---|---|---|
| LTC3813EG#PBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3813EG#TRPBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3813IG#PBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC3813IG#TRPBF | SSOP-28 | G | I | 05-08-1640 (G28) | 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 | |
|---|---|---|---|---|---|---|
| LTC3813EG#PBF | SSOP-28 | E | $5.36 | $3.75 | Yes | |
| LTC3813EG#TRPBF | SSOP-28 | E | $3.81 | Yes | ||
| LTC3813IG#PBF | SSOP-28 | I | $5.46 | $3.82 | Yes | |
| LTC3813IG#TRPBF | SSOP-28 | I | $3.88 | 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
- 24V Fan Supplies
- 48V Telecom and Base Station Power Supplies
- Networking Equipment, Servers
- Automotive and Industrial Control 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:
LTC3813
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.
