Overview
The LM2611BMF from Texas Instruments is a current-mode, PWM inverting switching regulator designed for low-power applications requiring efficient voltage inversion or reduction. This device operates from a wide input voltage range of 2.7 V to 14 V and can produce a regulated negative output voltage. It is particularly suited for battery-powered devices and portable electronics due to its high efficiency and compact form factor.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 5-Pin SOT-23 (DBV) |
| Switching Frequency | 1.4 MHz |
| Input Voltage Range | 2.7 V to 14 V |
| Output Voltage Range | -1.23 V to -22 V |
| Output Current | 1.2 A (Grade A), 0.9 A (Grade B) |
| RDS(ON) | 0.5 Ω (Grade A), 0.7 Ω (Grade B) |
| Shutdown Current | < 1 µA |
| Operating Temperature Range | -40°C to 125°C |
| Output Ripple | 1 mVp-p |
Key Features
- Efficient Voltage Inversion: Provides stable negative output voltage from lower input sources.
- Compact Form Factor: Small 5-pin SOT-23 package for easy integration into space-limited designs.
- High Efficiency: Achieved through the use of a low RDS(ON) DMOS FET.
- Low Shutdown Current: Less than 1 µA to save battery life.
- Simple Feedback Configuration: Output voltage can be set using just two resistors.
- Cycle-by-Cycle Current Limiting: Ensures safe operation by limiting switch current.
- Internal Compensation: Simplifies the design by eliminating the need for external compensation components.
Applications
- Portable Electronics: Suitable for powering portable devices with varying voltage requirements.
- Battery-Powered Devices: Ideal for extending battery life by efficiently managing power consumption.
- Low Power Circuits: Used in low power applications where voltage boosting or inversion is necessary.
- MR Head Bias, Digital Camera CCD Bias, LCD Bias, GaAs FET Bias: Specific applications where regulated negative voltages are required.
Q & A
- What is the LM2611BMF? The LM2611BMF is a current-mode, PWM inverting switching regulator from Texas Instruments.
- What is the input voltage range of the LM2611BMF? The input voltage range is from 2.7 V to 14 V.
- What is the typical output current of the LM2611BMF? The output current is 1.2 A for Grade A and 0.9 A for Grade B.
- What is the switching frequency of the LM2611BMF? The switching frequency is 1.4 MHz.
- What is the package type of the LM2611BMF? The package type is a 5-pin SOT-23 (DBV).
- How does the shutdown feature work? The shutdown pin can be activated to lower the quiescent current to less than 1 µA, saving battery life.
- What are the typical applications of the LM2611BMF? Typical applications include portable electronics, battery-powered devices, and low power circuits requiring voltage inversion.
- How is the output voltage set? The output voltage can be set using a simple feedback configuration with just two resistors.
- What is the thermal shutdown temperature of the LM2611BMF? The device enters thermal shutdown if the junction temperature exceeds 163°C.
- Is the LM2611BMF suitable for high-efficiency applications? Yes, it is designed for high efficiency through the use of a low RDS(ON) DMOS FET.
