Overview
The LM2660MX is a CMOS switched capacitor voltage converter integrated circuit manufactured by Texas Instruments. It operates as both a voltage doubler and inverter, making it suitable for various power supply applications where positive or negative voltages are required from a single supply. The device is particularly popular in portable electronics due to its small footprint and low power consumption. It can convert input voltages ranging from 1.5V to 5.5V, making it compatible with common battery and low-voltage power sources.
Structure and Working Principle
The LM2660MX utilizes a charge pump architecture with four internal switches that operate in two phases. During the first phase, the flying capacitor charges to the input voltage. In the second phase, the capacitor discharges to either double (in voltage doubler mode) or invert (in voltage inverter mode) the input voltage. The integrated circuit includes an oscillator that controls the switching frequency, typically around 10kHz to 150kHz. This design eliminates the need for external inductors, resulting in a compact solution compared to traditional switching regulators.
Key Features
The LM2660MX offers several notable features including low quiescent current (typically 120μA), high efficiency (up to 90%), and the ability to operate with input voltages as low as 1.5V. The device comes in a space-saving SOIC-8 package, suitable for compact designs. Additional features include built-in soft-start to limit inrush current, and the ability to be synchronized to an external clock source. The device also has a shutdown mode that reduces current consumption to less than 1μA when not in active use.
Application Areas
Common applications for the LM2660MX include generating negative supply rails for operational amplifiers in battery-powered equipment, doubling voltage for LCD bias in portable devices, and creating dual power supplies from single battery configurations. The IC is widely used in medical devices, portable instrumentation, industrial control systems, and consumer electronics. Its ability to work with low voltages makes it particularly valuable in designs powered by single-cell lithium-ion or alkaline batteries.
Maintenance and Precautions
When implementing the LM2660MX, proper PCB layout is crucial for optimal performance. The flying capacitor should be placed as close as possible to the IC, and low-ESR capacitors are recommended for both input and output filtering. Designers should be aware of output current limitations, which typically range from 40mA to 100mA depending on operating conditions. Thermal considerations are important when operating near maximum ratings, especially in high ambient temperature environments.
B2B Procurement Guide
When procuring LM2660MX ICs in volume, buyers should verify they're sourcing from authorized distributors to ensure authenticity. Lead times can vary, especially during semiconductor shortages, so planning inventory accordingly is advisable. Consider purchasing evaluation boards or samples before large volume orders to verify performance in the specific application. For long-term projects, inquire about the product's lifecycle status to avoid potential obsolescence issues.
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