Texas Instruments LM2664 DC/DC Adjustable Inverting Charge Pump Voltage Conv

The Texas Instruments LM2664M6/NOPB is a high-efficiency switched capacitor voltage converter designed to invert a positive input voltage into a corresponding negative output. It accepts a supply voltage from 1.8V to 5.5V and can deliver an adjustable output from -5.5V to -1.8V with a maximum output current of 40mA. This makes it an exceptionally versatile component for generating a local negative rail in space-constrained applications.

Operating at a 160kHz oscillator frequency, the device minimises output resistance and voltage ripple, ensuring stable and clean power delivery. Its standout feature is its remarkable power efficiency; with an operating current of just 220µA, it achieves a typical conversion efficiency greater than 91% at 40mA load, making it perfectly suited for battery-powered and portable electronics where every microwatt counts. Furthermore, the typical shutdown current is an ultra-low 1µA, maximising battery life in standby modes.

The converter uses only two external capacitors to perform the voltage inversion or doubling function, simplifying circuit design and saving valuable board space. It is housed in a compact SOT-23-6 surface-mount package, ideal for high-density PCB layouts. As a green product, it is manufactured with no antimony or bromine (no Sb/Br), aligning with modern environmental standards.

Key Features:

• Inverts or doubles the input supply voltage.
• 12Ω typical output impedance.
• High typical conversion efficiency of 91% at 40mA.
• 1µA typical shutdown current.
• Compact SOT-23-6 surface-mount package.

With its combination of low power consumption, high efficiency, and simple implementation, the LM2664 provides an ideal, robust power management solution for a wide range of modern electronic systems.