LTC1772
PRODUCTIONConstant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
- Part Models
- 8
- 1ku List Price
- Starting From $3.28
Overview
- 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
The LTC1772 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 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% duty cycle).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 |
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
Documentation
Data Sheet 1
User Guide 2
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC1772CS6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC1772CS6#TRPBF | 6-Lead TSOT-23 | ||
| LTC1772ES6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC1772ES6#TRPBF | 6-Lead TSOT-23 | ||
| LTC1772HS6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC1772HS6#TRPBF | 6-Lead TSOT-23 | ||
| LTC1772IS6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC1772IS6#TRPBF | 6-Lead TSOT-23 |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Switching Regulators & Controllers 2 | ||
| LTC3801 | PRODUCTION | Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT |
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC1772
- LTC1772B
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
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