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LTC4557

Dual SIM/Smart Card

Power Supply and Interface

FEATURES

s

s

s

s

s

s

s

DESCRIPTIO

s

s

s

s

Power Management and Signal Level Translators

for Two SIM Cards or Smart Cards

Independent 1.8V/3V V

CC

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

脳

3mm) QFN Package

The LTC

廬

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 100碌A(chǔ) and a shutdown current of less than

1碌A(chǔ). Board area is minimized by the low profile 3mm

脳

3mm

脳

0.75mm leadless QFN package.

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

*U.S. Patent No. 6,356,140

APPLICATIO S

s

s

s

GSM and 3G Cellular Phones

Wireless P.O.S. Terminals

Multiple SAM Card Interface

TYPICAL APPLICATIO

DV

CC

0.1碌F

DV

CC

CLKIN

RSTIN

DATA

碌CONTROLLER

V

BATT

DV

CC

1.2V TO 4.4V 3V TO 6V

0.1碌F

V

BATT

I/OA

RSTA

CLKA

V

CCA

LTC4557

GND

1碌F

V

CCB

ENABLE

M0

M1

CLKB

RSTB

I/OB

C1

C3

C2

C7

V

CC

CLK 1.8V/3V

SMART

RST

CARD

I/O

GND

C5

4557 TA01

C7

C2

C3

C1

1碌F

I/O

RST 1.8V/3V

SIM

CLK

CARD

V

CC

GND

C5

RSTX

5V/DIV

CLKX

5V/DIV

I/OX

5V/DIV

V

CCX

2V/DIV

C

VCCX

= 1碌F

10碌s/DIV

4557 G07

U

Deactivation Sequence

4557f

U

U

1

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