Datasheet > LTC4558

LTC4558

更新时间： 2023-12-20 18:43:59

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	151K
描述
双 SIM 卡 / 智能卡电源和接口

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LTC4558 数据手册

LTC4558

Dual SIM/Smart Card

Power Supply and Interface

FEATURES

DESCRIPTION

The LTC^®4558 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

pindetermineswhichchannelisopenforcommunication.

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.

■

Power Management and Control for Two SIM Cards

or Smart Cards

■

Independent 1.8V/3V V 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

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 cur-

rent of 65μA and a shutdown current of less than 1μA.

Board area is minimized by the low proﬁle 3mm × 3mm

× 0.75mm leadless QFN package.

■

Low Proﬁle 20-Lead (3mm × 3mm) QFN Package

APPLICATIONS

■

GSM, TD-SCDMA and other 3G Cellular Phones

■

Wireless Point-of-Sale Terminals

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

*Protected by U.S. Patents, including 6356140.

■

Multiple SIM Card Interfaces

TYPICAL APPLICATION

BATT

1.4V TO 4.4V 3V TO 6V

Deactivation Sequence

0.1μF

BATT

CLKIN

I/OA

I/O

RSTX

RSTIN

RSTA

CLKA

RST

CLK

1.8V/3V

5V/DIV

SIM

DATA

CARD A

CLKX

5V/DIV

CCA

CLKRUNA

CLKRUNB

GND

μCONTROLLER

1μF

GND

I/OX

5V/DIV

ENABLEA

ENABLEB

CSEL

CCB

CCX

2V/DIV

CLKB

RSTB

I/OB

CLK

RST

I/O

1.8V/3V

SIM

CARD B

4558 TA02

= 1μF

10μs/DIV

VCCX

VSELA

VSELB

GND

LTC4558

4558 TA01

4558fa

12 3 4 5 6 7...12

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