LTC1772 - Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
Features
- High Efficiency: Up to 94%
- High Output Currents Easily Achieved
- Wide VIN Range: 2.5V to 9.8V
- Constant Frequency 550kHz Operation
- Burst Mode® Operation at Light Load
- Low Dropout: 100% Duty Cycle
- Tiny 6-Lead SOT-23 Package
- 0.8V Reference Allows Low Output Voltages
- Current Mode Operation for Excellent Line and Load
- Transient Response
- Low Quiescent Current: 270µA
- Shutdown Mode Draws Only 8µA Supply Current
- ±2.5% Reference Accuracy
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1772 is a constant frequency current mode stepdown DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772 when the input voltage falls below 2.0V.
The LTC1772 provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. For applications where efficiency is a prime consideration, the LTC1772 is configured for Burst Mode operation, which enhances efficiency at low output current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100%dutycycle).In shutdown, the device draws a mere 8µA. High constant operating frequency of 550kHz allows the use of a small external inductor.
The LTC1772 is available in a small footprint 6-lead SOT-23.
| 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 |
|---|---|---|---|---|---|
| LTC1772CS6#PBF | SOT-23 | S6 | C | 05-08-1636 | Yes |
| LTC1772CS6#TRMPBF | SOT-23 | S6 | C | 05-08-1636 | Yes |
| LTC1772CS6#TRPBF | SOT-23 | S6 | C | 05-08-1636 | Yes |
| LTC1772ES6#PBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1772ES6#TRMPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1772ES6#TRPBF | SOT-23 | S6 | E | 05-08-1636 | Yes |
| LTC1772HS6#PBF | SOT-23 | S6 | H | 05-08-1636 | Yes |
| LTC1772HS6#TRMPBF | SOT-23 | S6 | H | 05-08-1636 | Yes |
| LTC1772HS6#TRPBF | SOT-23 | S6 | H | 05-08-1636 | Yes |
| LTC1772IS6#PBF | SOT-23 | S6 | I | 05-08-1636 | Yes |
| LTC1772IS6#TRMPBF | SOT-23 | S6 | I | 05-08-1636 | Yes |
| LTC1772IS6#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 | |
|---|---|---|---|---|---|---|
| LTC1772CS6#PBF | SOT-23 | C | $2.19 | Yes | ||
| LTC1772CS6#TRMPBF | SOT-23 | C | $2.19 | $1.83 | Yes | |
| LTC1772CS6#TRPBF | SOT-23 | C | $2.19 | $1.81 | Yes | |
| LTC1772ES6#PBF | SOT-23 | E | $2.33 | Yes | ||
| LTC1772ES6#TRMPBF | SOT-23 | E | $2.33 | $1.93 | Yes | |
| LTC1772ES6#TRPBF | SOT-23 | E | $2.33 | $1.91 | Yes | |
| LTC1772HS6#PBF | SOT-23 | H | $3.36 | Yes | ||
| LTC1772HS6#TRMPBF | SOT-23 | H | $3.36 | $2.38 | Yes | |
| LTC1772HS6#TRPBF | SOT-23 | H | $3.36 | $2.36 | Yes | |
| LTC1772IS6#PBF | SOT-23 | I | $3.20 | Yes | ||
| LTC1772IS6#TRMPBF | SOT-23 | I | $3.20 | $2.18 | Yes | |
| LTC1772IS6#TRPBF | SOT-23 | I | $3.20 | $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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC270A | LTC1772CS6 | 1 Amp, SOT-23 DC-DC Converter, 2.5 to 9.8Vin, 2.5Vout | $75.00 | |
| DC279A-B | LTC1736, LTC1772, LTC1762 | Low Cost VRM (Intel), 7.5 to 24Vin, 1.3V to 1.6Vout @ 14A, 1.5Vout @ 0.12 to 2.5A, 2.5Vout @ 0.15A | Contact Factory | |
| Buy Now | |||
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 | |
|---|---|---|---|---|---|---|
| LTC1772HS6#PBF | SOT-23 | H | $3.36 | Yes | ||
| LTC1772HS6#TRMPBF | SOT-23 | H | $3.36 | $2.38 | Yes | |
| LTC1772HS6#TRPBF | SOT-23 | H | $3.36 | $2.36 | Yes | |
| LTC1772IS6#PBF | SOT-23 | I | $3.20 | Yes | ||
| LTC1772IS6#TRMPBF | SOT-23 | I | $3.20 | $2.18 | Yes | |
| LTC1772IS6#TRPBF | SOT-23 | I | $3.20 | $2.16 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- One or Two Lithium-Ion-Powered Applications
- Cellular Telephones
- Wireless Modems
- Portable Computers
- Distributed 3.3V, 2.5V or 1.8V Power Systems
- 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:
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.
