LTC1772B
PRODUCTIONConstant Frequency Current Mode Step-Down DC/DC Controller in SOT-23
- Part Models
- 4
- 1ku List Price
- Starting From $2.88
Overview
- 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
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 | ||
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC1772BES6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC1772BES6#TRPBF | 6-Lead TSOT-23 | ||
| LTC1772BIS6#TRMPBF | 6-Lead TSOT-23 | ||
| LTC1772BIS6#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 1 | ||
| 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.