Overview
The LM2611AMF from Texas Instruments is a current mode, PWM inverting switching regulator. It operates from a supply voltage range of 2.7 V to 14 V and is capable of producing a regulated negative output voltage of up to -36 V. This regulator utilizes input and output inductors to achieve low voltage ripple and RMS current on both the input and output. With a high switching frequency of 1.4 MHz, the LM2611 allows for the use of small and low-cost inductors and capacitors, making it highly efficient.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switching Frequency | 1.4 | MHz |
| Supply Voltage Range | 2.7 to 14 | V |
| Output Voltage Range | Up to -36 | V |
| Output Ripple | 1 mVp-p | |
| Maximum Output Current | 1.2 A (Grade A), 0.9 A (Grade B) | A |
| RDS(ON) of DMOS FET | 0.5 Ω (Grade A), 0.7 Ω (Grade B) | Ω |
| Shutdown Current | < 1 µA | µA |
| Operating Temperature Range | -40 to 125 | °C |
| Package Type | 5-Pin SOT-23 |
Key Features
- High switching frequency of 1.4 MHz
- Low RDS(ON) DMOS FET for high efficiency
- Low output ripple of 1 mVp-p
- Capable of producing -5 V at 300 mA from a 5-V input
- Better regulation than a charge pump
- Uses tiny capacitors and inductors
- Wide input voltage range: 2.7 V to 14 V
- Low shutdown current: < 1 µA
- 5-Pin SOT-23 package
- 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 switching frequency of the LM2611?
The switching frequency of the LM2611 is 1.4 MHz.
- What is the input voltage range for the LM2611?
The input voltage range for the LM2611 is 2.7 V to 14 V.
- What is the maximum output voltage that the LM2611 can produce?
The LM2611 can produce a regulated negative output voltage of up to -36 V.
- What is the output ripple of the LM2611?
The output ripple of the LM2611 is 1 mVp-p.
- How does the LM2611 achieve low voltage ripple and RMS current?
The LM2611 achieves low voltage ripple and RMS current through the use of input and output inductors.
- What is the RDS(ON) of the DMOS FET in the LM2611?
The RDS(ON) of the DMOS FET in the LM2611 is 0.5 Ω for Grade A and 0.7 Ω for Grade B.
- 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.
- How is the output voltage set in the LM2611?
The output voltage in the LM2611 is set using a negative feedback pin with an external resistor divider.
- What are some common applications of the LM2611?
Common applications include MR Head Bias, Digital Camera CCD Bias, LCD Bias, GaAs FET Bias, and Positive to Negative Conversion.
