LT1176/LT1176-5 - Step-Down Switching Regulator
Features
- 1.2A Onboard Switch
- 100kHz Switching Frequency
- Excellent Dynamic Behavior
- DIP and Surface Mount Packages
- Only 8mA Quiescent Current
- Preset 5V Output Available
- Operates Up to 35V Input
- Micropower Shutdown Mode
Typical Application
Description
The LT1176 is a 1A 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 allows 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 below ground.
The LT1176 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 LT1176 nearly bust proof for output overloads or shorts. The input voltage range as a buck converter is 8V to 35V, but a self boot feature allows input voltages as low as 5V in the inverting and boost configurations.
The LT1176 is available in a low cost 8-lead DIP package with frequency preset at 100kHz and current limit at 1.7A. An adjustable output is offered as well as a preset 5V version. For further design details and application help, see the LT1074/LT1076 data sheet and Application Note 44.
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 |
|---|---|---|---|---|---|
| LT1176CN8-5#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1176CN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1176CSW-5#PBF | SW-20 | SW | C | 05-08-1620 (SW20) | Yes |
| LT1176CSW-5#TRPBF | SW-20 | SW | C | 05-08-1620 (SW20) | Yes |
| LT1176CSW#PBF | SW-20 | SW | C | 05-08-1620 (SW20) | Yes |
| LT1176CSW#TRPBF | SW-20 | SW | C | 05-08-1620 (SW20) | 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 | |
|---|---|---|---|---|---|---|
| LT1176CN8-5#PBF | N-8 | C | $3.75 | $3.10 | Yes | |
| LT1176CN8#PBF | N-8 | C | $3.75 | $3.10 | Yes | |
| LT1176CSW-5#PBF | SW-20 | C | $5.42 | $4.30 | Yes | |
| LT1176CSW-5#TRPBF | SW-20 | C | $4.40 | Yes | ||
| LT1176CSW#PBF | SW-20 | C | $5.42 | $4.30 | Yes | |
| LT1176CSW#TRPBF | SW-20 | C | $4.40 | 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.Click here to view our complete list of demo boards
Applications
- Buck Converter with Output Voltage Range of 2.5V to 30V
- Positive-to-Negative Converter
- Negative Boost Converter
- Multiple Output Buck Converter
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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:
LT1176
LT1176-5
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.
