Overview
The LM2663MX, produced by Texas Instruments, is a CMOS charge-pump voltage converter designed to invert or double input supply voltages. This device operates within a voltage range of 1.5 V to 5.5 V, converting positive voltages to their corresponding negative voltages or doubling the input voltage. It is particularly suited for battery-powered systems due to its low operating current of 300 μA and high efficiency greater than 90% at most loads.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage (V+ to GND) | 1.5 | - | 5.5 | V |
| Output Current | - | - | 200 | mA |
| Output Resistance | - | 3.5 | 7 | Ω |
| Oscillator Frequency | - | 150 | - | kHz |
| Conversion Efficiency | - | 86% | - | % |
| Operating Ambient Temperature | -40 | - | 85 | °C |
| Operating Junction Temperature | -40 | - | 105 | °C |
| Shutdown Supply Current | - | 10 | - | μA |
Key Features
- Inverts or doubles input supply voltage in the range of 1.5 V to 5.5 V.
- Typical output resistance of 3.5 Ω.
- Typical conversion efficiency of 86% at 200 mA.
- Low current shutdown mode, reducing quiescent current to 10 μA.
- Selectable oscillator frequency (LM2662: 20 kHz or 150 kHz; LM2663: fixed at 150 kHz).
- Uses two low-cost capacitors, eliminating the need for inductors and associated EMI issues.
Applications
- Battery-powered systems, such as laptop computers and cellular phones.
- Medical instruments and handheld devices.
- Operational amplifier power supplies and interface power supplies.
- Generating negative supply voltages and positive voltage doubling.
Q & A
- What is the primary function of the LM2663MX?
The LM2663MX is a CMOS charge-pump voltage converter that inverts or doubles input supply voltages in the range of 1.5 V to 5.5 V.
- What is the typical output resistance of the LM2663MX?
The typical output resistance is 3.5 Ω.
- What is the conversion efficiency of the LM2663MX at 200 mA output current?
The conversion efficiency is typically 86% at 200 mA.
- How does the LM2663MX handle shutdown mode?
The LM2663MX has a low current shutdown mode that reduces the quiescent current to 10 μA when the device is disabled.
- What are the oscillator frequency options for the LM2663MX?
The LM2663MX has a fixed oscillator frequency of 150 kHz, while the LM2662 offers selectable frequencies of 20 kHz or 150 kHz.
- What type of capacitors are required for the LM2663MX?
The LM2663MX uses two low-cost capacitors to provide the output current, eliminating the need for inductors.
- What is the operating temperature range of the LM2663MX?
The operating ambient temperature range is -40°C to 85°C, and the operating junction temperature range is -40°C to 105°C).
- What are some common applications of the LM2663MX?
Common applications include battery-powered systems, medical instruments, operational amplifier power supplies, and interface power supplies).
- How does the LM2663MX manage EMI compared to inductor-based converters?
The LM2663MX uses capacitors instead of inductors, which reduces EMI issues associated with inductor-based converters).
- What is the package type and pin count of the LM2663MX?
The LM2663MX is available in an 8-pin SOIC (D) package).
