Product Overview: LTC1555LEGN#TR

The LTC1555LEGN#TR is a high-performance, micropower switched capacitor SIM power supply designed by Linear Technology, now part of Analog Devices. This device is tailored to provide a regulated charge pump voltage that is required to power a Subscriber Identity Module (SIM) card in cellular telephones and other smart card applications. The compact and efficient LTC1555LEGN#TR is an ideal solution for portable electronics where space and power consumption are critical design parameters.

Key Features

• Regulated Output Voltage: The LTC1555LEGN#TR provides a stable 2.5V or 3V selectable output voltage, ensuring that the SIM card operates within its specified voltage range for reliable performance.
• Low Quiescent Current: With a low quiescent current of 11μA typical, this device is optimized for battery-powered applications, helping to extend the overall battery life of the product.
• High Efficiency: The switched capacitor design allows for high efficiency, reducing the power dissipation and thermal footprint of the product.
• Shutdown Mode: It includes a shutdown feature that reduces the supply current to 0.1μA, further conserving battery life when the SIM card is not in use.
• Soft Start: The soft-start circuitry minimizes inrush current during power-up, providing a smoother ramp-up of the output voltage and reducing stress on the battery.
• Thermal Protection: Built-in thermal protection ensures that the device operates within safe temperature limits, enhancing the reliability and longevity of the product.
• Small Package: The LTC1555LEGN#TR comes in a 16-pin narrow SSOP package, which is suitable for space-constrained applications.

Applications

The LTC1555LEGN#TR is versatile and can be used in a variety of applications that require a regulated voltage for SIM cards, including:

• Cellular Phones
• Smart Card Readers
• Portable Communication Devices
• Personal Digital Assistants (PDAs)
• Other Smart Card-Enabled Devices

With its combination of low power consumption, small footprint, and robust feature set, the LTC1555LEGN#TR from Linear Technology is an excellent choice for designers looking to integrate SIM card power supply functionality into their next-generation portable devices.