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參數資料
| 型號： | LTC4558EUD#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, PLASTIC, QFN-20 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 146K |
| 代理商： | LTC4558EUD#TR |
LTC4558
1
4558fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
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 cur-
rent of 65μA and a shutdown current of less than 1μA.
Board area is minimized by the low prole 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 Prole 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
3V TO 6V
DVCC
1.4V TO 4.4V
LTC4558
μCONTROLLER
VCCA
I/OA
DVCC
RSTA
CLKA
C1
C5
C3
C2
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
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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