Overview
The LM2611BMFX, produced by Texas Instruments, is a current mode, PWM inverting switching regulator. This device operates from a wide input voltage range of 2.7 V to 14 V and is capable of producing a regulated negative output voltage. It features a high switching frequency of 1.4 MHz, which allows for the use of small and low-cost inductors and capacitors. The LM2611 is designed for high efficiency and includes a low RDS(ON) DMOS FET, cycle-by-cycle current limiting, and internal compensation. It is available in a compact 5-pin SOT-23 package and comes in two grades: Grade A with a 1.2-A current limit and 0.5-Ω RDS(ON), and Grade B with a 0.9-A current limit and 0.7-Ω RDS(ON).
Key Specifications
| Specification | Value |
|---|---|
| Package | 5-Pin SOT-23 (DBV) |
| Operating Temperature Range | -40°C to 125°C |
| Input Voltage Range | 2.7 V to 14 V |
| Switching Frequency | 1.4 MHz |
| Output Ripple | 1 mVp-p |
| Maximum Output Current | Grade A: 1.2 A, Grade B: 0.9 A |
| RDS(ON) | Grade A: 0.5 Ω, Grade B: 0.7 Ω |
| Shutdown Current | <1 µA |
| Power Dissipation | 2 W |
Key Features
- High switching frequency of 1.4 MHz
- Low RDS(ON) DMOS FET
- Low output ripple of 1 mVp-p
- Wide input voltage range: 2.7 V to 14 V
- Low shutdown current: <1 µA
- Uses tiny capacitors and inductors
- Cycle-by-cycle current limiting and internal compensation
- Shutdown pin for power saving
- Negative feedback pin for easy output voltage setting
Applications
- MR Head Bias
- Digital Camera CCD Bias
- LCD Bias
- GaAs FET Bias
- Positive to Negative Conversion
Q & A
- What is the operating input voltage range of the LM2611?
The LM2611 operates from an input voltage range of 2.7 V to 14 V. - What is the switching frequency of the LM2611?
The switching frequency of the LM2611 is 1.4 MHz. - What is the typical output ripple of the LM2611?
The typical output ripple of the LM2611 is 1 mVp-p. - What are the current limits for Grade A and Grade B of the LM2611?
Grade A has a current limit of 1.2 A, and Grade B has a current limit of 0.9 A. - What is the RDS(ON) for Grade A and Grade B of the LM2611?
Grade A has an RDS(ON) of 0.5 Ω, and Grade B has an RDS(ON) of 0.7 Ω. - What is the shutdown current of the LM2611?
The shutdown current of the LM2611 is less than 1 µA. - What package type is the LM2611 available in?
The LM2611 is available in a 5-pin SOT-23 package. - What are some common applications of the LM2611?
The LM2611 is used in applications such as MR Head Bias, Digital Camera CCD Bias, LCD Bias, GaAs FET Bias, and Positive to Negative Conversion. - How does the LM2611 achieve high efficiency?
The LM2611 achieves high efficiency through the use of a low RDS(ON) DMOS FET and internal compensation. - What is the purpose of the shutdown pin on the LM2611?
The shutdown pin on the LM2611 can be activated to lower the quiescent current and save battery life when the part is not needed.
