LTC4555,LTC4555EUD-PBF,LTC4555EUD-TRPBF

Part No.:
LTC4555,LTC4555EUD-PBF,LTC4555EUD-TRPBF
Download:
Download
Description:
SIM Power Supply and Level Translator
File Size:
97 K
Page:
8 Pages
Logo:
Maker:
LINER [ LINEAR TECHNOLOGY ]
PCB Prototype

July 19, 2018:

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PCB Datasheet:1PCB Datasheet:1
LTC4555
SIM Power Supply
and Level Translator
FEATURES
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DESCRIPTION
The LTC
®
4555 provides power conversion and signal
level shifting needed for low voltage 2.5G and 3G cellular
telephones to interface with 1.8V or 3V subscriber identity
modules (SIMs). The part meets all type approval require-
ments for 1.8V and 3V SIMs and smart cards. The part
contains an LDO linear regulator to supply SIM power at
either 1.8V or 3V from a 3V to 6V input. The output volt-
age is selected with a single pin 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 20μA operating current
and <1μA shutdown current. Board area is minimized by
the 3mm
×
3mm leadless QFN package.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
SIM Power Supply: 1.8V/3V at 50mA
Input Voltage Range: 3V to 6V
Controller Voltage Range: 1.2V to 4.4V
14kV ESD On All SIM Contact Pins
Meets All ETSI, IMT-2000 and ISO7816 SIM/Smart
Card Interface Requirements
Level Translators to 1.8V or 3V
20μA Operating Current
Logic-Controlled Shutdown (I
SD
< 1μA)
Available in a Low Profile, 16-Pin (3mm
×
3mm)
QFN Package
APPLICATIONS
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SIM Interface in 3G Cellular Telephones
Smart Card Readers
TYPICAL APPLICATION
Typical SIM Interface
(1.2V TO 4.4V)
V
CC
0.1μF
DV
CC
SHDN
CONTROLLER
V
SEL
LTC4555
R
IN
C
IN
DATA
GND
GND
4555 TA01
V
BAT
(3V TO 6V)
0.1μF
V
BAT
V
CC
1μF
RST
CLK
I/0
RST
CLK
I/0
V
CC
SIM/
SMART CARD
INTERFACE
4555fb
1