LT1776 - Wide Input Range, High Efficiency, Step-Down Switching Regulator
Features
- Wide Input Range: 7.4V to 40V
- Tolerates Input Transients to 60V
- 700mA Peak Switch Rating
- Adaptive Switch Drive Maintains Efficiency at High Load Without Pulse Skipping at Light Load
- True Current Mode Control
- 200kHz Fixed Operating Frequency
- Synchronizable to 400kHz
- Low Supply Current in Shutdown: 30µA
- Available in 8-Pin SO and PDIP Packages
Typical Application
Description
The LT1776 is a wide input range, high efficiency Buck (step-down) switching regulator. The monolithic die includes all oscillator, control and protection circuitry. The part can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current. Current mode control delivers excellent dynamic input supply rejection and short-circuit protection.The LT1776 contains several features to enhance efficiency. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply (see Applications Information). The action of the LT1776 switch circuitry is also load dependent. At medium to high loads, the output switch circuitry maintains fast rise time for good efficiency. At light loads, rise time is deliberately reduced to avoid pulse skipping behavior.
The available SO-8 package and 200kHz switching frequency allow for minimal PC board area requirements.
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 |
|---|---|---|---|---|---|
| LT1776CN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1776CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1776CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1776IN8#PBF | N-8 | N | I | 05-08-1510 (N8) | Yes |
| LT1776IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1776IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | 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 | |
|---|---|---|---|---|---|---|
| LT1776CN8#PBF | N-8 | C | $3.05 | $2.50 | Yes | |
| LT1776CS8#PBF | SO-8 | C | $3.15 | $2.60 | Yes | |
| LT1776CS8#TRPBF | SO-8 | C | $2.66 | Yes | ||
| LT1776IN8#PBF | N-8 | I | $3.55 | $2.85 | Yes | |
| LT1776IS8#PBF | SO-8 | I | $3.60 | $3.00 | Yes | |
| LT1776IS8#TRPBF | SO-8 | I | $3.06 | 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 |
|---|---|---|---|
| DC204A-B | LT1776CS8 | High Voltage, High Eff., Step Down Switching Regulator, 7V to 60Vin, 3.3V and 5V @ 0.5A Out (thru-hole input cap) | $75.00 | |
| Buy Now | |||
Applications
- Automotive DC/DC Converters
- Cellular Phone Battery Charger Accessories
- IEEE 1394 Step-Down Converters
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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:
LT1776
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.
