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The LTC1555LEGN-1.8 provides the power conversion and level shifting required to connect low-voltage GSM and WCDMA cellular phones to a 1.8V, 3V, or 5V subscriber identification module (SIM). The device contains a patented buck/boost charge pump DC/DC converter* that provides a stable VCC supply voltage for the SIM card. The input voltage can vary from 2.6V to 6V, allowing direct connection to the battery. The output voltage can be set to 1.8V, 3V, 5V or connected directly to the VIN pin.

An internal level shifter allows controllers operating from supplies as low as 1.425V to be connected to 1.8V, 3V and 5V SIMs. A soft-start feature limits inrush current at turn-on, mitigating start-up problems that can occur when the input is supplied by another low-power DC/DC converter. 32μA of operating current and 1μA of shutdown current maximise battery life. A small 16-pin narrow-body SSOP package and only three small external capacitors are required to minimise board area.

LTC1555LEGN-1.8 Features

Buck/boost charge pump generates 1.8V, 3V or 5V

Input voltage range: 2.6V to 6V

Controller VCC range: 1.425V to 4.4V

>10kV ESD protection on all SIM contacts

Short circuit and thermal protection

Meets all ETSI and IMT-2000 SIM interface requirements

1.8V to 5V signal level converter

Very low operating current: 32μA

Very low shutdown current: < 1μA

Soft-start function to limit inrush current on switch-on

1MHz switching frequency

Available in 16-pin narrow-body SSOP package

LTC1555LEGN-1.8 Applications

SIM interface in GSM cellular phones

WCDMA SIM interface

Smart card readers

• 1.Is the inventory and price seen on the platform accurate?

  A: all online goods on the shelves can be ordered online, but considering the large liquidity of spot inventory, it is not possible to achieve 100% accuracy at present. In case of any abnormality, you can contact our company online and give the corresponding solution.

• 2.Are all our products genuine?

  A: our self-supporting products are from cooperative domestic and foreign original factories or authorized agents, and the source can be traced to ensure the original and authentic products.

• 3.Can you provide the qualification certificate of the original factory or agent?

  A: at present, our self-employed brands TI，ST，ADI，NXP，LATTICE，CYPRESS，INFINEON，XILINX and other first-line brands. Other channels are the original factory and agency channels. If necessary, we can communicate and confirm according to the specific brand and model.

• 4.Can I make an inquiry through the company's website?

  A: You can inquire through the website, or by phone and email.

• 5.When can I deliver the goods after placing an order? How long will it take to get there?

  A: the delivery date is marked in most commodity information. You can estimate the delivery time of the commodity according to the delivery date. The specific arrival time depends on the warehouse where the commodity is located and the logistics mode you choose.

• 6.Can the company issue an invoice?

  A: you can issue ordinary invoices for individual users or special VAT invoices for enterprise users.