LT1074 - Step-Down Switching Regulator
Features
- 5A Onboard Switch (LT1074)
- Operates Up to 60V Input
- 100kHz Switching Frequency
- Greatly Improved Dynamic Behavior
- Available in Low Cost 5 and 7-Lead Packages
- Only 8.5mA Quiescent Current
- Programmable Current Limit
- Micropower Shutdown Mode
Typical Application
Description
The LT1074 is a 5A (LT1076 is rated at 2A) monolithic bipolar switching regulator which requires only a few external parts for normal operation. The power switch, all oscillator and control circuitry, and all current limit components,are included on the chip. The topology is a classic positive “buck” configuration but several design innovations allow this device to be used as a positive-to-negative converter, a negative boost converter, and as a flyback converter. The switch output is specified to swing 40V below ground, allowing the LT1074 to drive a tapped-inductor in the buck mode with output currents up to 10A.
The LT1074 uses a true analog multiplier in the feedback loop. This makes the device respond nearly instantaneously to input voltage fluctuations and makes loop gain independent of input voltage. As a result, dynamic behavior of the regulator is significantly improved over previous designs.
On-chip pulse by pulse current limiting makes the LT1074 nearly bust-proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 60V, but a self-boot feature allows input voltages as low as 5V in the inverting and boost configurations.
The LT1074 is available in lowcost TO-220 or DD packages with frequency pre-set at 100kHz and current limit at 6.5A (LT1076 =2.6A). A 7-pin TO-220 package is also available which allows current limit to be adjusted down to zero. In addition, full micropower shutdown can be programmed. See Application Note 44 for design details.
A fixed 5V output, 2A version is also available. See LT1076-5.
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 |
|---|---|---|---|---|---|
| LT1074CT#06PBF | TO-220 | T | C | 05-08-1421 (Flow 06) | Yes |
| LT1074CT#30PBF | TO-220 | T | C | 05-08-1421 (Standard) | Yes |
| LT1074CT#PBF | TO-220 | T | C | 05-08-1421 (Standard) | Yes |
| LT1074CT7#06PBF | TO-220 | T7 | C | 05-08-1422 (Standard) | Yes |
| LT1074CT7#PBF | TO-220 | T7 | C | 05-08-1422 (Standard) | Yes |
| LT1074HVCT#06PBF | TO-220 | T | C | 05-08-1421 (Flow 06) | Yes |
| LT1074HVCT#PBF | TO-220 | T | C | 05-08-1421 (Standard) | Yes |
| LT1074HVCT7#06PBF | TO-220 | T7 | C | 05-08-1422 (Standard) | Yes |
| LT1074HVCT7#PBF | TO-220 | T7 | C | 05-08-1422 (Standard) | Yes |
| LT1074HVIT#06PBF | TO-220 | T | I | 05-08-1421 (Flow 06) | Yes |
| LT1074HVIT#30PBF | TO-220 | T | I | 05-08-1421 (Standard) | Yes |
| LT1074HVIT#PBF | TO-220 | T | I | 05-08-1421 (Standard) | Yes |
| LT1074HVIT7#06PBF | TO-220 | T7 | I | 05-08-1422 (Flow 06) | Yes |
| LT1074HVIT7#35PBF | TO-220 | T7 | I | 05-08-1422 (Standard) | Yes |
| LT1074HVIT7#PBF | TO-220 | T7 | I | 05-08-1422 (Standard) | Yes |
| LT1074IT#06PBF | TO-220 | T | I | 05-08-1421 (Flow 06) | Yes |
| LT1074IT#PBF | TO-220 | T | I | 05-08-1421 (Standard) | Yes |
| LT1074IT7#PBF | TO-220 | T7 | I | 05-08-1422 (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 | |
|---|---|---|---|---|---|---|
| LT1074CT#06PBF | TO-220 | C | $6.17 | $5.05 | Yes | |
| LT1074CT#30PBF | TO-220 | C | $6.62 | $5.50 | Yes | |
| LT1074CT#PBF | TO-220 | C | $6.17 | $5.05 | Yes | |
| LT1074CT7#06PBF | TO-220 | C | $7.17 | $5.90 | Yes | |
| LT1074CT7#PBF | TO-220 | C | $7.17 | $5.90 | Yes | |
| LT1074HVCT#06PBF | TO-220 | C | $9.25 | $7.60 | Yes | |
| LT1074HVCT#PBF | TO-220 | C | $9.25 | $7.60 | Yes | |
| LT1074HVCT7#06PBF | TO-220 | C | $10.25 | $8.40 | Yes | |
| LT1074HVCT7#PBF | TO-220 | C | $10.25 | $8.40 | Yes | |
| LT1074HVIT#06PBF | TO-220 | I | $12.50 | $10.25 | Yes | |
| LT1074HVIT#30PBF | TO-220 | I | $12.95 | $10.70 | Yes | |
| LT1074HVIT#PBF | TO-220 | I | $12.50 | $10.25 | Yes | |
| LT1074HVIT7#06PBF | TO-220 | I | $13.50 | $10.80 | Yes | |
| LT1074HVIT7#35PBF | TO-220 | I | $13.95 | $11.25 | Yes | |
| LT1074HVIT7#PBF | TO-220 | I | $13.50 | $10.80 | Yes | |
| LT1074IT#06PBF | TO-220 | I | $8.33 | $6.85 | Yes | |
| LT1074IT#PBF | TO-220 | I | $8.33 | $6.85 | Yes | |
| LT1074IT7#PBF | TO-220 | I | $9.15 | $7.35 | Yes | |
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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
- Buck Converter with Output Voltage Range of 2.5V to 50V
- Tapped-Inductor Buck Converter with 10A Output at 5V
- Positive-to-Negative Converter
- Negative Boost Converter
- Multiple Output Buck Converter
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Design Tools
LTspice
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LT1074
LT1074HV
Technical Support
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- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
