Overview
The LM2731YMF/NOPB is a high-performance boost converter IC produced by Texas Instruments. This device operates at fixed frequencies of either 0.6 MHz or 1.6 MHz, making it suitable for applications requiring fast transient response over a wide input voltage range. The LM2731 is packaged in a compact SOT-23 package, which is ideal for space-constrained designs. It incorporates a 22-V internal DMOS FET switch and provides cycle-by-cycle current limit protection along with thermal shutdown protection, ensuring reliable and safe operation.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Junction Temperature | -40 | 125 | °C | |
| Lead Temperature (Soldering, 5 sec.) | 300 | °C | ||
| Input Supply Voltage (VIN) | 2.7 | 14 | V | |
| Switching Frequency | 0.6 (Y Option) | 1.6 (X Option) | MHz | |
| Switch Current Limit | 1.8 | A | ||
| Switch ON-Resistance (RDS(ON)) | 300 | 450 | mΩ | |
| Quiescent Current (IQ) | 2 | 500 | µA | |
| Shutdown Threshold (VSHDN) | 0.5 | 1.5 | V | |
| Maximum Duty Cycle | 78% (X Option) | 93% (X Option) | 88% (Y Option) | % |
Key Features
- Fixed Frequency Operation: Operates at 0.6 MHz or 1.6 MHz, depending on the option chosen.
- Internal 22-V DMOS FET Switch: Provides high efficiency and reliability.
- Current Mode Control: Includes pulse-by-pulse current limiting protection.
- Thermal Shutdown Protection: Protects the device from overheating by turning off the output switch when the junction temperature exceeds 160°C.
- Shutdown Control: The device can be turned off by pulling the shutdown pin low.
- Compact SOT-23 Package: Suitable for space-constrained designs.
- Low RDS(ON) DMOS FET: Minimizes power loss and enhances efficiency.
Applications
- Portable Electronics: Ideal for portable phones, games, and other handheld devices.
- Local Boost Regulators: Used in various applications requiring local voltage boosting.
- Power Management Systems: Suitable for systems needing efficient and reliable power conversion.
Q & A
- What are the operating frequencies of the LM2731YMF/NOPB? The LM2731YMF/NOPB operates at fixed frequencies of either 0.6 MHz or 1.6 MHz.
- What is the maximum switch current limit of the LM2731YMF/NOPB? The maximum switch current limit is 1.8 A.
- What type of protection does the LM2731YMF/NOPB have? The device has cycle-by-cycle current limit protection and thermal shutdown protection.
- How is the shutdown function controlled in the LM2731YMF/NOPB? The device can be turned off by pulling the shutdown pin low.
- What is the typical quiescent current of the LM2731YMF/NOPB? The typical quiescent current is between 2 µA and 500 µA.
- What is the maximum duty cycle of the LM2731YMF/NOPB? The maximum duty cycle is up to 93% for the X option and up to 88% for the Y option.
- What is the junction temperature range for the LM2731YMF/NOPB? The junction temperature range is from -40°C to 125°C.
- What package type is the LM2731YMF/NOPB available in? The device is available in a SOT-23 package.
- What are some common applications of the LM2731YMF/NOPB? Common applications include portable electronics, local boost regulators, and power management systems.
- How does the thermal shutdown protection work in the LM2731YMF/NOPB? The thermal shutdown protection turns off the output switch when the junction temperature exceeds 160°C.
