LT1082 - 1A High Voltage, Efficiency Switching Voltage Regulator
Features
- Wide Input Voltage Range: 3V to 75V
- High Switch Voltage: 100V
- Low Quiescent Current: 4.5mA
- Internal 1A Switch
- Shutdown Mode Draws Only 120µA Supply Current
- Isolated Flyback Regulation Mode for Fully Floating Outputs
- Can Be Externally Synchronized
- Available in MiniDIP and TO-220 Packages
- Same Pinout as LT1072
Typical Application
Description
The LT1082 is a monolithic high voltage switching regulator. It can be operated in all standard switching configurations including buck, boost, flyback, forward, and inverting. A 1A high efficiency switch is included on the die along with all oscillator, control, and protection circuitry.
The LT1082 operates with supply voltages from 3V to 75V, switch voltage up to 100V and draws only 4.5mA quiescent current. It can deliver load power up to 20W with no external power devices. By utilizing current-mode switching techniques, it provides excellent AC and DC load and line regulation.
An externally activated shutdown mode reduces total supply current to 120µA typical for standby operation. Totally isolated and regulated outputs can be generated by using the optional “isolated flyback regulation mode” built into the LT1082, without the need for optocouplers or extra transformer windings.
The LT1082 has a unique feature to provide high voltage short-circuit protection. When the FB pin is pulled down to 0.6V and the current out of the pin reaches approximately 350µA, the switching frequency will shift down from 60kHz to 12kHz.
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 |
|---|---|---|---|---|---|
| LT1082CN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1082CQ#PBF | DDPAK-5 | Q | C | 05-08-1461 | Yes |
| LT1082CQ#TRPBF | DDPAK-5 | Q | C | 05-08-1461 | Yes |
| LT1082CT#06PBF | C | Yes | |||
| LT1082CT#PBF | TO-220 | T | C | 05-08-1421 (Standard) | Yes |
| LT1082IN8#PBF | N-8 | N | I | 05-08-1510 (N8) | Yes |
| LT1082IQ#PBF | DDPAK-5 | Q | I | 05-08-1461 | Yes |
| LT1082IQ#TRPBF | DDPAK-5 | Q | I | 05-08-1461 | Yes |
| LT1082IT#30PBF | TO-220 | T | I | 05-08-1421 (Standard) | Yes |
| LT1082IT#PBF | TO-220 | T | I | 05-08-1421 (Standard) | 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 | |
|---|---|---|---|---|---|---|
| LT1082CN8#PBF | N-8 | C | $5.42 | $4.40 | Yes | |
| LT1082CQ#PBF | DDPAK-5 | C | $6.75 | $5.40 | Yes | |
| LT1082CQ#TRPBF | DDPAK-5 | C | $5.52 | Yes | ||
| LT1082CT#06PBF | C | $6.25 | $5.15 | Yes | ||
| LT1082CT#PBF | TO-220 | C | $6.25 | $5.15 | Yes | |
| LT1082IN8#PBF | N-8 | I | $6.25 | $5.15 | Yes | |
| LT1082IQ#PBF | DDPAK-5 | I | $7.75 | $6.30 | Yes | |
| LT1082IQ#TRPBF | DDPAK-5 | I | $6.42 | Yes | ||
| LT1082IT#30PBF | TO-220 | I | $7.70 | $6.40 | Yes | |
| LT1082IT#PBF | TO-220 | I | $7.25 | $5.95 | 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 |
|---|---|---|---|
| DC224A | LT1339CSW / LT1082CQ | Buck Controller, 4.5V to 60Vin, 3.3V/5V/7V/ 12Vout @ 3Amp (thru-hole caps) | Contact Factory | |
| Buy Now | |||
Applications
- Telecom 5V Supply at 0.7A from -48V
- 90V Supply at 120mA from 15V
- All Applications Using LT1072
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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:
LT1082
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.
