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LT LTC1555LEGN-1.8 SIM Power Supply and Level Converter

Shenzhen Mingjiada Electronics Co., Ltd., as a specialist supplier of genuine electronic components, stocks the LTC1555LEGN-1.8—a SIM power supply and level conversion chip—providing efficient power conversion and level shifting solutions for mobile devices such as GSM and WCDMA cellular phones.

【LTC1555LEGN-1.8 Product Overview】

The LTC1555LEGN-1.8 is a SIM power supply and level shifter chip specifically designed for low-voltage GSM and WCDMA cellular phones. Housed in a 16-pin narrow SSOP package, it integrates a buck/boost charge pump with level shifting functionality.

The LTC1555LEGN-1.8 chip generates 1.8V, 3V or 5V output voltages from a wide input range (2.6V to 6V), enabling direct connection to the battery.

The LTC1555LEGN-1.8 operates at a low quiescent current of 32μA and a shutdown current below 1μA, significantly extending battery life. Its internal level shifter enables controllers operating from as low as 1.425V to interface with 1.8V, 3V, and 5V SIM cards.

【LTC1555LEGN-1.8 Key Performance Parameters】

The performance parameters of the LTC1555LEGN-1.8#TRPBF demonstrate its value in mobile device applications. It features an exceptionally low operating current of just 32μA, with a shutdown current below 1μA. This is crucial for battery-powered mobile devices, maximising battery life.

The LTC1555LEGN-1.8 chip incorporates robust internal ESD protection, delivering over 10kV ESD protection on all SIM pins. This significantly enhances interface reliability and resistance to electrostatic damage.

Operating at a switching frequency of 1MHz, it achieves a propagation delay of no more than 18ns. The LTC1555LEGN-1.8 also incorporates short-circuit and over-temperature protection, ensuring safe system operation.

【LTC1555LEGN-1.8 Technical and Performance Advantages】

The LTC1555LEGN-1.8 delivers over 10kV ESD protection across all SIM pins, incorporates short-circuit and over-temperature protection, and complies with all ETSI and IMT-2000 SIM interface requirements.

The LTC1555LEGN-1.8 incorporates a soft-start function that effectively limits inrush current during power-up, mitigating potential start-up issues when the input is supplied by another low-power DC/DC converter.

Operating at a switching frequency of 1MHz, the integrated level shifter supports signal level conversion from 1.8V to 5V. The LTC1555LEGN-1.8 requires only three small external capacitors, significantly reducing PCB footprint.

【LTC1555LEGN-1.8 Applications】

The LTC1555LEGN-1.8#TRPBF is primarily employed in GSM cellular phone SIM interfaces, providing reliable SIM card connectivity solutions for 2G and 3G mobile communication devices.

With advancements in communication technology, the LTC1555LEGN-1.8 is also suitable for WCDMA SIM interfaces, meeting the heightened requirements for SIM card interfaces in the 3G era. Furthermore, it can be employed in various smart card readers, extending its application scope beyond mobile telephones.

【LTC1555LEGN-1.8 Design and Packaging】

The LTC1555LEGN-1.8 utilises a 16-pin narrow-body SSOP package measuring 0.154 inches (3.90mm) in width, making it suitable for space-constrained portable device applications.

The LTC1555LEGN-1.8 employs surface-mount technology (SMT) for installation, facilitating automated production lines and enhancing mass-production efficiency. The device operates within a temperature range of -40°C to 85°C (TA), meeting the demands of diverse harsh environments.

Packaging options for the LTC1555LEGN-1.8 include tube and tape & reel (TR) configurations, with standard quantities of 100 and 2500 pieces respectively, catering to varying production scale requirements.