LTC1771 - 10µA Quiescent Current High Efficiency Step-Down DC/DC Controller
Features
- Very Low Standby Current: 10µA
- Available in Space-Saving 8-Lead MSOP Package
- Output Currents: Up to 5A
- Wide VIN Range: 2.8V to 20V Operation
- VOUT Range: 1.23V to 18V
- High Efficiency: Over 93% Possible
- ±2% Output Accuracy
- Very Low Dropout Operation: 100% Duty Cycle
- Current Mode Operation for Excellent Line and Load Transient Response
- Defeatable Burst Mode™ Operation
- Short-Circuit Protected
- Optional Programmable Soft-Start
- Micropower Shutdown: IQ = 2µA
Typical Application
Description
The LTC1771 is a high efficiency current mode step-down DC/DC controller that draws as little as 10µA DC supply current to regulate the output at no load while maintaining high efficiency for loads up to several amps. The LTC1771 drives an external P-channel power MOSFET using a current mode, constant off-time architecture. An external sense resistor is used to program the operating current level. Current mode control provides short-circuit protection, excellent transient response and controlled start-up behavior. Burst Mode operation enables the LTC1771 to maintain high efficiency down to extremely low currents. Shutdown mode further reduces the supply current to a mere 2µA. For low noise applications, Burst Mode operation can be easily disabled with the MODE pin. Wide input supply range of 2.8V to 18V (20V maximum) and 100% duty cycle operation for low dropout make the LTC1771 ideal for a wide variety of battery-powered applications where maximizing battery life is important. The LTC1771’s availability in both 8-lead MSOP and SO packages provides for a minimum area solution.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 |
|---|---|---|---|---|---|
| LTC1771EMS8#PBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1771EMS8#TRPBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1771ES8#PBF | SO-8 | S8 | E | 05-08-1610 (S8) | Yes |
| LTC1771ES8#TRPBF | SO-8 | S8 | E | 05-08-1610 (S8) | Yes |
| LTC1771IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC1771IS8#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 | |
|---|---|---|---|---|---|---|
| LTC1771EMS8#PBF | MS-8 | E | $3.25 | $2.75 | Yes | |
| LTC1771EMS8#TRPBF | MS-8 | E | $2.81 | Yes | ||
| LTC1771ES8#PBF | SO-8 | E | $3.14 | $2.65 | Yes | |
| LTC1771ES8#TRPBF | SO-8 | E | $2.71 | Yes | ||
| LTC1771IS8#PBF | SO-8 | I | $3.25 | $2.75 | Yes | |
| LTC1771IS8#TRPBF | SO-8 | I | $2.81 | 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
- Cellular Telephones and Wireless Modems
- 1- to 4-Cell Lithium-Ion-Powered Applications
- Portable Instruments
- Battery-Powered Equipment
- Battery Chargers
- Scanners
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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:
LTC1771
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.
