LTC1555IGN#TRPBF

Translators, Level Shifters Overview

The LTC1555IGN#TRPBF is a SIM power supply and level translator in a 16-lead narrow SSOP package. It features a step-up/step-down charge pump DC/DC converter with an input voltage range of 2.7V to 10V. The regulated VCC output provides up to 10mA at VIN ≥ 2.7V or 20mA at VIN ≥ 3V, programmable to 3V, 5V, or direct VIN connection via M0/M1 pins. Operating current is 60μA, with shutdown current under 1μA. It includes soft start for inrush limiting, short-circuit protection, overtemperature protection, and >10kV ESD on SIM contact pins. Switching frequency is 650kHz.

Translators, Level Shifters Feature Summary

• Integrated step-up/step-down charge pump generates regulated 5V or 3V output from a wide 2.7V to 10V input range.
• Provides level translation between controller digital I/O (DVCC) and SIM interface signals (CLK, RST, DATA, I/O).
• Includes soft start functionality to limit inrush current during turn-on and shutdown sequences.
• Features high ESD protection (>10kV) on all subscriber identity module contact pins.

Translators, Level Shifters Applications

• Subscriber Identity Module (SIM) interface in GSM cellular telephones
• Smart card readers requiring 3V to 5V level translation
• Portable devices needing low-power SIM power regulation

Translators, Level Shifters Procurement Notes

Verify the specific suffix 'IGN' corresponds to the Industrial temperature range (-40°C to 85°C) and the 16-lead Narrow SSOP package configuration. Confirm that the '#TRPBF' designation indicates tape and reel packaging with lead-free composition. Ensure compatibility with existing board layouts regarding the 16-pin SSOP footprint and pinout assignments defined in the datasheet.

Translators, Level Shifters Selection Notes

Select this component when interfacing 3V controllers with 3V or 5V SIM cards. It is suitable for applications requiring minimal external components, needing only three capacitors. Consider the 60μA operating current for battery life optimization. Note that the LTC1556 variant offers an auxiliary LDO, which is not present in the LTC1555 model selected here.

Translators, Level Shifters Part Context

The LTC1555 is part of the Linear Technology SIM Power Supply family, designed specifically for GSM cellular telephone applications. It complements other charge pump regulators like the LTC1515 and LTC1516 series but distinguishes itself by integrating both power conversion and bidirectional level shifting in a single compact package.

Translators, Level Shifters Replacement Considerations

LTC1555CGN#PBF: Same function and pinout but in commercial temperature range (0°C to 70°C) and tube packaging instead of tape and reel.