Overview
The LM2611AMFX, produced by Texas Instruments, is a 1.4-MHz Cuk Converter integrated circuit. It operates as a current-mode PWM inverting switching regulator, capable of producing a regulated negative output voltage from a positive input voltage. The device is designed to work with a wide input voltage range of 2.7 V to 14 V and can deliver up to -5 V at 300 mA from a 5-V input. The LM2611AMFX features a low RDS(ON) DMOS FET, which enhances efficiency and reduces voltage ripple. It is packaged in a small 5-pin SOT-23 package, making it suitable for space-constrained applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Switching Frequency | 1.3 | 1.4 | 1.5 | MHz |
| Input Voltage Range | 2.7 | - | 14 | V |
| Output Voltage Range | -3.3 | - | -36 VIN(MAX) | V |
| Output Current Limit | - | 1.2 A (Grade A), 0.9 A (Grade B) | - | A |
| RDS(ON) | - | 0.5 Ω (Grade A), 0.7 Ω (Grade B) | - | Ω |
| Shutdown Current | - | <1 µA | - | µA |
| Operating Junction Temperature | -40 | - | 125 | °C |
| Package Type | - | - | 5-pin SOT-23 | - |
Key Features
- High switching frequency of 1.4 MHz, allowing for the use of small and low-cost inductors and capacitors.
- Low RDS(ON) DMOS FET for high efficiency.
- Wide input voltage range of 2.7 V to 14 V.
- Regulated negative output voltage up to -36 VIN(MAX).
- Low shutdown current of less than 1 µA.
- Internal compensation and cycle-by-cycle current limiting.
- Simple output voltage setting using a negative feedback pin with two external resistors.
- Thermal shutdown protection.
- Pulse-skipping or hysteretic mode at low loads to maintain regulation.
Applications
- MR Head Bias in magnetic recording systems.
- Digital Camera CCD Bias.
- LCD Bias.
- GaAs FET Bias.
- Positive to Negative Voltage Conversion.
Q & A
- What is the switching frequency of the LM2611AMFX?
The switching frequency of the LM2611AMFX is 1.4 MHz.
- What is the input voltage range for the LM2611AMFX?
The input voltage range is from 2.7 V to 14 V.
- How is the output voltage set for the LM2611AMFX?
The output voltage is set using a negative feedback pin with two external resistors.
- What is the typical current limit for the LM2611AMFX?
The typical current limit is 1.2 A for Grade A and 0.9 A for Grade B.
- What is the package type of the LM2611AMFX?
The package type is a 5-pin SOT-23.
- Does the LM2611AMFX have thermal shutdown protection?
- What is the shutdown current of the LM2611AMFX?
The shutdown current is less than 1 µA.
- What are some common applications of the LM2611AMFX?
Common applications include MR Head Bias, Digital Camera CCD Bias, LCD Bias, GaAs FET Bias, and Positive to Negative Voltage Conversion.
- How does the LM2611AMFX handle low load conditions?
The LM2611AMFX enters a pulse-skipping or hysteretic mode at low loads to maintain regulation.
- What type of FET is integrated into the LM2611AMFX?
The LM2611AMFX features a low RDS(ON) DMOS FET.
