LT1076 - Step-Down Switching Regulator
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.
Features
Typical Application  | Applications
Packaging     |
Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LT1076CQ#PBF | DDPAK-5 | C | $5.00 | $3.95 |
| LT1076CQ#TRPBF | DDPAK-5 | C | $4.07 | |
| LT1076CR#PBF | DDPAK-7 | C | $5.42 | $4.30 |
| LT1076CR#TRPBF | DDPAK-7 | C | $4.42 | |
| LT1076CT#06PBF | TO-220 | C | $4.33 | $3.40 |
| LT1076CT#30PBF | TO-220 | C | $4.78 | $3.85 |
| LT1076CT#PBF | TO-220 | C | $4.33 | $3.40 |
| LT1076CT7#PBF | TO-220 | C | $5.00 | $3.95 |
| LT1076HVCR#PBF | DDPAK-7 | C | $9.42 | $7.45 |
| LT1076HVCR#TRPBF | DDPAK-7 | C | $7.57 | |
| LT1076HVCT#06PBF | TO-220 | C | $7.58 | $6.00 |
| LT1076HVCT#PBF | TO-220 | C | $7.58 | $6.00 |
| LT1076HVCT7#PBF | TO-220 | C | $8.75 | $6.90 |
| LT1076HVIR#PBF | DDPAK-7 | I | $10.95 | $9.05 |
| LT1076HVIR#TRPBF | DDPAK-7 | I | $9.17 | |
| LT1076HVIT#06PBF | TO-220 | I | $8.92 | $7.35 |
| LT1076HVIT#PBF | TO-220 | I | $8.92 | $7.35 |
| LT1076IQ#PBF | DDPAK-5 | I | $5.80 | $4.75 |
| LT1076IQ#TRPBF | DDPAK-5 | I | $4.87 | |
| LT1076IR#PBF | DDPAK-7 | I | $6.30 | $5.15 |
| LT1076IR#TRPBF | DDPAK-7 | I | $5.27 | |
| LT1076IT#06PBF | TO-220 | I | $5.92 | $4.85 |
| LT1076IT#PBF | TO-220 | I | $5.92 | $4.85 |
- LT1074 Package Drawing LT1074
- LT1074 Package Drawing LT1074
- LT1074 Package Drawing LT1074
- LT1074 Package Drawing LT1074
- AN44 - LT1074/LT1076 Design Manual
- DN53 - High Performance Frequency Compensation Gives DC-to-DC Converter 75µs Response With High Stability
- DN69 - Low Parts Count DC/DC Converter Circuit With 3.3V and 5V Outputs
- R117 Reliability Data
- LT1076 Footprints and Symbols
- LT1076 Demo Circuit - Step-Down Switching Regulator (10-40V to 5V @ 2A)
- LT1076HV Demo Circuit - Step Down Switching Regulator(25V to 5V @ 1.5A)
