LTC4557 Dual SIM/Smart Card Power Supply and Interface

The LTC®4557 provides power conversion and signal level translation needed for 2.5G and 3G cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The part meets all requirements for 1.8V and 3V SIMs. The part contains LDO regulators to power 1.8V or 3V SIM cards from a 2.7V to 5.5V input. The output voltages can be set using the two voltage selection pins 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 a low operating current of less than 100µA and a shutdown current of less than 1µA. Board area is minimized by the low profile 3mm x 3mm x 0.75mm leadless QFN package

产品特点 Features

Power Management and Signal Level Translators for Two SIM Cards or Smart Cards
Independent 1.8V/3V VCC Control for Both Cards
Automatic Level Translation
ISO7816, ETSI and EMV Compatible
Dynamic Pull-Ups Deliver Fast Signal Rise Times*
Built-In Fault Protection Circuitry
Automatic Activation/Deactivation Sequencing Circuitry
Low Operating/Shutdown Current
>10kV ESD on SIM Card Pins
Compatible with EMV Fault Tolerance Requirements
Available in 16-Lead (3mm ´ 3mm) QFN Package

参数

应用

GSM and 3G Cellular Phones
Wireless P.O.S. Terminals
Multiple SAM Card Interface

典型应用图

LTC4557 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC4557EUD	QFN	16	E	$1.71	$1.20
LTC4557EUD#PBF	QFN	16	E	$1.71	$1.20
LTC4557EUD#TR	QFN	16	E		$1.26
LTC4557EUD#TRPBF	QFN	16	E		$1.26

LTC4557 数据手册及相关资料下载

数据手册 (英文) : LTC4557 - Dual SIM/Smart Card Power Supply and Interface.PDF
设计要点 (中文) : DN289 Single Interface Chip Controls Two Smart Cards.PDF
可靠性数据 : R415 Reliability Data .PDF