LT1076
PRODUCTIONStep-Down Switching Regulator
- Part Models
- 23
- 1ku List Price
- Starting From $5.76
Overview
- 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
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.
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
Documentation
Data Sheet 1
Application Note 1
Design Note 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT1076CQ#PBF | 5-Lead DD Pak | ||
| LT1076CQ#TRPBF | 5-Lead DD Pak | ||
| LT1076CR#PBF | 7-Lead DD Pak | ||
| LT1076CR#TRPBF | 7-Lead DD Pak | ||
| LT1076CT#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1076CT#30PBF | 5-Lead TO-220 (Flow 30) | ||
| LT1076CT#PBF | 5-Lead TO-220 | ||
| LT1076CT7#PBF | 7-Lead TO-220 | ||
| LT1076HVCR#PBF | 7-Lead DD Pak | ||
| LT1076HVCR#TRPBF | 7-Lead DD Pak | ||
| LT1076HVCT#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1076HVCT#PBF | 5-Lead TO-220 | ||
| LT1076HVCT7#PBF | 7-Lead TO-220 | ||
| LT1076HVIR#PBF | 7-Lead DD Pak | ||
| LT1076HVIR#TRPBF | 7-Lead DD Pak | ||
| LT1076HVIT#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1076HVIT#PBF | 5-Lead TO-220 | ||
| LT1076IQ#PBF | 5-Lead DD Pak | ||
| LT1076IQ#TRPBF | 5-Lead DD Pak | ||
| LT1076IR#PBF | 7-Lead DD Pak | ||
| LT1076IR#TRPBF | 7-Lead DD Pak | ||
| LT1076IT#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1076IT#PBF | 5-Lead TO-220 |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 10, 2022 - 22_0175 Laser Top Mark Conversion for DDPAK & TO220 Packages Assembled in ADPG. Country of Origin Code [MY] To Be Incorporated On Top Mark |
||
| LT1076CQ#PBF | PRODUCTION | |
| LT1076CQ#TRPBF | PRODUCTION | |
| LT1076CR#PBF | PRODUCTION | |
| LT1076CR#TRPBF | PRODUCTION | |
| LT1076CT#06PBF | PRODUCTION | |
| LT1076CT#30PBF | PRODUCTION | |
| LT1076CT#PBF | PRODUCTION | |
| LT1076CT7#PBF | PRODUCTION | |
| LT1076HVCR#PBF | PRODUCTION | |
| LT1076HVCR#TRPBF | PRODUCTION | |
| LT1076HVCT#06PBF | PRODUCTION | |
| LT1076HVCT#PBF | PRODUCTION | |
| LT1076HVCT7#PBF | PRODUCTION | |
| LT1076HVIR#PBF | PRODUCTION | |
| LT1076HVIR#TRPBF | PRODUCTION | |
| LT1076HVIT#06PBF | PRODUCTION | |
| LT1076HVIT#PBF | PRODUCTION | |
| LT1076IQ#PBF | PRODUCTION | |
| LT1076IQ#TRPBF | PRODUCTION | |
| LT1076IR#PBF | PRODUCTION | |
| LT1076IR#TRPBF | PRODUCTION | |
| LT1076IT#06PBF | PRODUCTION | |
| LT1076IT#PBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice 2
- LT1076HV Demo Circuit - Step Down Switching Regulator(25V to 5V @ 1.5A)
- LT1076 Demo Circuit - Step-Down Switching Regulator (10-40V to 5V @ 2A)
Models for the following parts are available in LTspice:
- LT1076
- LT1076-5
- LT1076HV
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.