LTC1772B - Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
Features
- Burst Mode Operation Disabled for Lower Output Ripple at Light Loads
- High Efficiency: Up to 94%
- High Output Currents Easily Achieved
- Wide VIN Range: 2.5V to 9.8V
- Constant Frequency 550kHz Operation
- Low Dropout: 100% Duty Cycle
- Output Voltage down to 0.8V
- Current Mode Operation for Excellent Line and Load Transient Response
- Shutdown Mode Draws Only 8µA Supply Current
- Tiny 6-Lead SOT-23 Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1772B is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772B when the input voltage falls below 2.0V.
The LTC1772B provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. In shutdown, the device draws a mere 8µA.
To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High constant operating frequency of 550kHz allows the use of a small external inductor.
The LTC1772B is available in a small footprint 6-lead SOT-23.
For a Burst Mode operation enabled version of the LTC1772B, please refer to the LTC1772 data sheet.
| Burst Mode | |
| LTC1772 | Yes |
| LTC1772B | No |
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 |
|---|---|---|---|---|---|
| LTC1772BES6#PBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1772BES6#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1772BES6#TRPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1772BIS6#PBF | SOT-23 | S6 | I | 05-08-1636 | Yes |
| LTC1772BIS6#TRMPBF | SOT-23 | S6 | I | 05-08-1636 | Yes |
| LTC1772BIS6#TRPBF | SOT-23 | S6 | I | 05-08-1636 | 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 | |
|---|---|---|---|---|---|---|
| LTC1772BES6#PBF | SOT-23 | E | $2.33 | Yes | ||
| LTC1772BES6#TRMPBF | SOT-23 | E | $2.33 | $1.93 | Yes | |
| LTC1772BES6#TRPBF | SOT-23 | E | $2.33 | $1.91 | Yes | |
| LTC1772BIS6#PBF | SOT-23 | I | $3.09 | Yes | ||
| LTC1772BIS6#TRMPBF | SOT-23 | I | $3.09 | $2.21 | Yes | |
| LTC1772BIS6#TRPBF | SOT-23 | I | $3.09 | $2.16 | 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
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1772BIS6#PBF | SOT-23 | I | $3.09 | Yes | ||
| LTC1772BIS6#TRMPBF | SOT-23 | I | $3.09 | $2.21 | Yes | |
| LTC1772BIS6#TRPBF | SOT-23 | I | $3.09 | $2.16 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- One or Two Lithium-Ion-Powered Applications
- Cellular Telephones
- Wireless Devices
- Portable Computers
- Distributed 3.3V, 2.5V or 1.8V Power Systems
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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:
LTC1772
LTC1772B
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.
