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LTC4558 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4558
Description  Dual SIM/Smart Card Power Supply and Interface
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4558 Datasheet(HTML) 1 Page - Linear Technology

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LTC4558
1
4558fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual SIM/Smart Card
Power Supply and Interface
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
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 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.
Deactivation Sequence
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 Profile 20-Lead (3mm × 3mm) QFN Package
GSM, TD-SCDMA and other 3G+ Cellular Phones
Wireless Point-of-Sale Terminals
Multiple SIM Card Interfaces
, 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.
DVCC
VBATT
VBATT
3V TO 6V
DVCC
1.4V TO 4.4V
LTC4558
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
CSEL
VSELA
VSELB
ENABLEA
ENABLEB
CLKRUNA
CLKRUNB
0.1
μF
4558 TA01
1.8V/3V
SIM
CARD A
1.8V/3V
SIM
CARD B
VCC
I/O
RST
CLK
GND
GND
VCC
CLK
RST
I/O
RSTX
5V/DIV
CLKX
5V/DIV
I/OX
5V/DIV
VCCX
2V/DIV
10
μs/DIV
CVCCX = 1μF
4558 TA02


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