Linear Technology - Product Page

LTC4555 - SIM Power Supply and Level Translator

Datasheet

Documentation

Features

SIM Power Supply: 1.8V/3V at 50mA
Input Voltage Range: 3V to 6V
Controller Voltage Range: 1.2V to 4.4V
14kV ESD on all SIM Contact Pins
Meets all ETSI, IMT-2000 and ISO7816 SIM/Smart Card Interface Requirements
Level Translators to 1.8V or 3V
20µA Operating Current
Logic Controlled Shutdown (I_SD < 1µA)
Available in 0.75mm Profile, 3mm x 3mm QFN Package

Typical Application

Description

The LTC4555 provides power conversion and signal level shifting needed for low voltage 2.5G and 3G cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The part meets all type approval requirements for 1.8V and 3V SIMs and smart cards. The part contains an LDO linear regulator to supply SIM power at either 1.8V or 3V from a 3V to 6V input. The output voltage is selected with a single pin and up to 50mA of load current can be supplied.

Internal level translators allow controllers operating with supplies as low as 1.2V to interface with 1.8V or 3V smart cards. Battery life is maximized by 20µA operating current and <1µA shutdown current. Board area is minimized by the 3mm x 3mm leadless QFN package.

Packaging

3x3 QFN-16

Order Info

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*
LTC4555EUD#PBF	QFN	16	E	$1.71	$1.20
LTC4555EUD#TRPBF	QFN	16	E		$1.26
LTC4555EUD	QFN	16	E	$3.42	$2.40
LTC4555EUD#TR	QFN	16	E		$2.52

^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.