Overview
The LM2664M6X from Texas Instruments is a CMOS charge-pump voltage converter designed to invert a positive input voltage in the range of 1.8 V to 5.5 V to the corresponding negative voltage of −1.8 V to −5.5 V. This device is particularly suited for battery-powered systems due to its high efficiency and low quiescent current. The LM2664 operates at a 160-kHz oscillator frequency, which helps in reducing output resistance and voltage ripple. It uses two external low-cost capacitors to achieve up to 40 mA of output current, making it an ideal choice for various portable and low-power applications.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Input Supply Voltage (V+) | 1.8 | 5.5 | V | |
| Output Current (IL) | 40 | mA | ||
| Output Resistance (ROUT) | 12 | 25 | Ω | |
| Oscillator Frequency (fOSC) | 80 | 160 | 160 | kHz |
| Switching Frequency (fSW) | 40 | 80 | 80 | kHz |
| Power Efficiency | 90% | 91% | ||
| Shutdown Supply Current (ISD) | 1 | μA | ||
| Package Type | SOT-23-6 | |||
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Inverts positive input voltage in the range of 1.8 V to 5.5 V to the corresponding negative voltage of −1.8 V to −5.5 V.
- Uses two low-cost external capacitors to provide up to 40 mA of output current.
- High efficiency with a typical conversion efficiency of 91% at 40 mA output current.
- Low quiescent current of 220 μA and shutdown current of 1 μA.
- Operates at a 160-kHz oscillator frequency to reduce output resistance and voltage ripple.
- Shutdown mode available to disable the device and reduce quiescent current.
- Compact 6-pin SOT-23 package.
Applications
- Cellular Phones
- Pagers
- PDAs (Personal Digital Assistants)
- Operational Amplifier Power Suppliers
- Interface Power Suppliers
- Handheld Instruments
Q & A
- What is the input voltage range of the LM2664?
The input voltage range of the LM2664 is from 1.8 V to 5.5 V. - What is the maximum output current of the LM2664?
The maximum output current of the LM2664 is 40 mA. - What is the typical conversion efficiency of the LM2664 at 40 mA output current?
The typical conversion efficiency of the LM2664 at 40 mA output current is 91%. - How does the LM2664 reduce output resistance and voltage ripple?
The LM2664 operates at a 160-kHz oscillator frequency to reduce output resistance and voltage ripple. - What is the quiescent current and shutdown current of the LM2664?
The quiescent current is 220 μA, and the shutdown current is 1 μA. - What package type is the LM2664 available in?
The LM2664 is available in a 6-pin SOT-23 package. - What are some common applications of the LM2664?
Common applications include cellular phones, pagers, PDAs, operational amplifier power suppliers, interface power suppliers, and handheld instruments. - How does the shutdown mode work on the LM2664?
The shutdown mode is activated by applying a voltage less than 20% of V+ to the shutdown pin, which reduces the quiescent current to 1 μA. - What is the operating temperature range of the LM2664?
The operating temperature range of the LM2664 is from -40°C to 85°C. - What are the key components required for the LM2664 to function?
The LM2664 requires two low-cost external capacitors to function.
