LT1950 - Single Switch PWM Controller with Auxiliary Boost Converter
Features
- Wide Input Range: 3V to 25V
- Programmable Volt-Second Clamp
- Output Power Levels from 25W to 500W
- Auxiliary Boost Converter Provides 10V Gate Drive from VIN as Low as 3V
- Programmable Operating Frequency (100kHz to 500kHz) with One External Resistor
- Programmable Slope Compensation
- Programmable Leading Edge Blanking
- ±2% Internal 1.23V Reference
- Accurate Shutdown Pin Threshold with Programmable Hysteresis
- 60ns Current Sense Delay
- 2.5V Auxiliary Reference Output
- Synchronizable to an External Clock up to 1.5 • fOSC
- Current Mode Control
- Small 16-Pin SSOP Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT1950 is a wide input range, forward, boost, flyback and SEPIC controller that drives an N-channel power MOSFET with few external components required.
A resistor programmable duty cycle clamp can be used to generate a volt-second clamp for forward converter applications. An internal boost switcher is available for creating a separate supply for the output gate driver, allowing 10V gate drive from input voltages as low as 3V. The LT1950’s operating frequency can be set with an external resistor over a 100kHz to 500kHz range and a SYNC pin allows the part to be synchronized to an external clock. Additional programmability exists for leading edge blanking and slope compensation.
A fast current sense comparator achieves 60ns current sense delay and the error amplifier is a true voltage mode error amplifier, allowing a wide range of compensation networks. An accurate shutdown pin with programmable hysteresis is available for undervoltage lockout and shutdown. The LT1950 is available in a small 16-Pin SSOP package.
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 |
|---|---|---|---|---|---|
| LT1950EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LT1950EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LT1950IGN#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LT1950IGN#TRPBF | SSOP-16 | GN | I | 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 | |
|---|---|---|---|---|---|---|
| LT1950EGN#PBF | SSOP-16 | E | $4.20 | $2.90 | Yes | |
| LT1950EGN#TRPBF | SSOP-16 | E | $2.96 | Yes | ||
| LT1950IGN#PBF | SSOP-16 | I | $4.73 | $3.20 | Yes | |
| LT1950IGN#TRPBF | SSOP-16 | I | $3.26 | 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC442A | LT1950EGN | Telecom High Efficiency, 36V to 72V Input, 3.3V @ 25A Output, Isolated DC/DC Converter | $175.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT1950IGN#PBF | SSOP-16 | I | $4.73 | $3.20 | Yes | |
| LT1950IGN#TRPBF | SSOP-16 | I | $3.26 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Telecom Power Supplies
- Automotive Power Supplies
- Portable Electronic Equipment
- Isolated and Nonisolated DC/DC Converters
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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:
LT1950
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.
