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LTC4557 Datenblatt(PDF) 1 Page - Linear Technology

Teilenummer LTC4557
Bauteilbeschribung  Dual SIM/Smart Card Power Supply and Interface
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Hersteller  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4557 Datenblatt(HTML) 1 Page - Linear Technology

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LTC4557
4557f
s
GSM and 3G Cellular Phones
s
Wireless P.O.S. Terminals
s
Multiple SAM Card Interface
s
Power Management and Signal Level Translators
for Two SIM Cards or Smart Cards
s
Independent 1.8V/3V VCC Control for Both Cards
s
Automatic Level Translation
s
ISO7816, ETSI and EMV Compatible
s
Dynamic Pull-Ups Deliver Fast Signal Rise Times*
s
Built-In Fault Protection Circuitry
s
Automatic Activation/Deactivation Sequencing
Circuitry
s
Low Operating/Shutdown Current
s
>10kV ESD on SIM Card Pins
s
Compatible with EMV Fault Tolerance Requirements
s
Available in 16-Lead (3mm
× 3mm) QFN Package
Dual SIM/Smart Card
Power Supply and Interface
Deactivation Sequence
, LTC and LT are registered trademarks of Linear Technology Corporation.
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 100
µA and a shutdown current of less than
1
µA. Board area is minimized by the low profile 3mm ×
3mm
× 0.75mm leadless QFN package.
DVCC
VBATT
VBATT
3V TO 6V
DVCC
1.2V TO 4.4V
LTC4557
µCONTROLLER
VCCA
I/OA
DVCC
RSTA
CLKA
C1
C1
C5
C5
C3
C2
C7
C7
C2
C3
GND
VCCB
CLKB
RSTB
I/OB
CLKIN
0.1
µF
1
µF
1
µF
RSTIN
DATA
ENABLE
M0
M1
0.1
µF
4557 TA01
1.8V/3V
SIM
CARD
1.8V/3V
SMART
CARD
VCC
I/O
RST
CLK
GND
GND
VCC
CLK
RST
I/O
*U.S. Patent No. 6,356,140
RSTX
5V/DIV
CLKX
5V/DIV
I/OX
5V/DIV
VCCX
2V/DIV
10
µs/DIV
CVCCX = 1µF
4557 G07
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO


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