The LM2685MTCX is a switched capacitor voltage doubler manufactured by National Semiconductor (now Texas Instruments). It's designed to provide a higher output voltage than the input voltage, using a charge pump technique. This device is well-suited for applications where a boosted voltage is needed from a low-voltage supply.

Applications

• LCD bias supplies: Generating the necessary voltage for LCD displays.
• White LED drivers: Providing a stable voltage to drive white LEDs in backlighting applications.
• Portable electronics: Powering various components in mobile phones, tablets, and other handheld devices.
• Memory programming voltage: Supplying the required voltage for programming EEPROMs and flash memories.
• General-purpose voltage boosting: Providing a higher voltage from a lower voltage source in a variety of electronic circuits.

Features

• Voltage doubling: Provides an output voltage approximately twice the input voltage.
• High efficiency: Achieves high efficiency in converting the input voltage to the output voltage.
• Low quiescent current: Minimizes power consumption when the device is not actively switching.
• Shutdown mode: Reduces power consumption further when the device is not needed.
• Small package size: Available in small surface-mount packages for space-constrained applications.
• Requires few external components: simplifies the design and reduces the BOM cost.

Benefits

• Increased voltage output: Allows for generating higher voltages from low-voltage supplies.
• High efficiency: Minimizes power loss and extends battery life in portable devices.
• Low power consumption: Suitable for battery-powered and energy-sensitive applications.
• Simplified circuit design: Reduces the number of components required for voltage boosting.
• Compact size: Allows for integration into space-constrained designs.

Additional Details

The LM2685MTCX typically comes in a TSSOP package. It requires external capacitors for the charge pump function. The datasheet specifies the recommended capacitor values and other design considerations. The switching frequency is internally set. The 'MTCX' likely refers to the package type and tape and reel packaging. Careful attention should be given to layout considerations to minimize noise and maximize efficiency. Consult the datasheet for detailed specifications and application notes.