LTC4558 Dual SIM/Smart Card Power Supply and Interface

The LTC4558 provides the power conversion and signal level translation needed for advanced cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The device meets all requirements for 1.8V and 3V SIMs and 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. A channel select pin determines which channel is open for communication. Separate enable pins for each channel allow both cards to be powered at once and allow for faster transition from one channel to the other.

Internal level translators allow controllers operating with supplies as low as 1.4V to interface with 1.8V or 3V Smart Cards. Battery life is maximized by a low operating current of 65µA and a shutdown current of less than 1µA. Board area is minimized by the low proﬁ le 3mm × 3mm × 0.75mm leadless QFN package

产品特点 Features

Power Management and Control for Two SIM Cards or Smart Cards
Independent 1.8V/3V VCC Control for Both Cards
Supports Simultaneous Powering of Both Cards
Fast Channel Switching
Automatic Level Translation
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
Meets EMV Fault Tolerance Requirements
Low Proﬁ le 20-Lead (3mm × 3mm) QFN Package

参数

应用

GSM, TD-SCDMA and other 3G+ Cellular Phones
Wireless Point-of-Sale Terminals
Multiple SIM Card Interfaces

典型应用图

LTC4558 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) *
LTC4558EUD#PBF	QFN	20	E	$2.21	$1.55
LTC4558EUD#TRPBF	QFN	20	E		$1.61

LTC4558 数据手册及相关资料下载

数据手册 (英文) : LTC4558 - 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