Overview
The LM2731YMFX is a high-performance switching regulator IC produced by Texas Instruments. This device operates as a boost converter, available in two fixed frequency options: 0.6 MHz and 1.6 MHz. It is designed to provide efficient power conversion over a wide input voltage range, making it suitable for various applications requiring compact and reliable power solutions.
The LM2731YMFX features a 22-V internal DMOS FET switch, which minimizes power loss and allows for the use of small inductors and capacitors, thereby reducing the overall footprint of the power supply circuit. The device is packaged in a SOT-23 package, enhancing its suitability for space-constrained designs.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Supply Voltage (VIN) | 2.7 | 14 | V | |
| Switching Frequency (FSW) | 0.6 (Y Option), 1.6 (X Option) | 0.8 (Y Option), 1.85 (X Option) | MHz | |
| Switch Current Limit (ISW) | 1.4 | 1.8 | 2.0 | A |
| Maximum Duty Cycle (DMAX) | 78% (X Option), 88% (Y Option) | 93% (X Option), 95% (Y Option) | % | |
| Operating Junction Temperature (TJ) | -40 | 125 | °C | |
| Switch ON-Resistance (RDS(ON)) | 300 | 400 | 550 | mΩ |
| Quiescent Current (IQ) | 2 | 400 | 500 | µA |
Key Features
- High Efficiency: The LM2731YMFX offers high efficiency across a wide range of load currents, making it suitable for power-sensitive applications.
- Internal 22-V DMOS FET Switch: This feature reduces power loss and enables the use of smaller external components.
- Fixed Frequency Operation: Available in 0.6 MHz and 1.6 MHz options, providing fast transient response.
- Current Mode Control: Includes pulse-by-pulse current limiting protection for reliable operation.
- Shutdown Feature: The device can be shut down via the SHDN pin, reducing quiescent current to near zero.
- Compact SOT-23 Package: Ideal for space-constrained designs.
Applications
- Portable Electronics: Suitable for powering devices such as smartphones, tablets, and other handheld electronics.
- Industrial Power Supplies: Can be used in various industrial applications requiring efficient and reliable power conversion.
- Automotive Systems: Applicable in automotive systems where compact and efficient power solutions are necessary.
- Medical Devices: Ideal for medical devices that require high efficiency and reliability in power supply.
- Consumer Electronics: Used in a variety of consumer electronics such as TVs, audio equipment, and gaming consoles.
Q & A
- What are the available switching frequencies for the LM2731YMFX?
The LM2731YMFX operates at fixed frequencies of 0.6 MHz and 1.6 MHz.
- What is the maximum input voltage for the LM2731YMFX?
The maximum input voltage is 14 V.
- What is the maximum switch current limit for the LM2731YMFX?
The maximum switch current limit is 1.8 A.
- How does the shutdown feature work on the LM2731YMFX?
The device can be shut down by connecting the SHDN pin to ground, which reduces the quiescent current to near zero.
- What is the operating junction temperature range for the LM2731YMFX?
The operating junction temperature range is -40°C to 125°C.
- What is the typical quiescent current for the LM2731YMFX?
The typical quiescent current is 400 µA.
- What type of package does the LM2731YMFX come in?
The device is packaged in a SOT-23 package.
- Does the LM2731YMFX have built-in protection features?
Yes, it includes pulse-by-pulse current limiting protection.
- What is the maximum duty cycle for the LM2731YMFX?
The maximum duty cycle is 93% for the X option and 95% for the Y option.
- How efficient is the LM2731YMFX?
The device offers high efficiency across a wide range of load currents, typically above 80%.
