ltc4555 Linear Technology Corporation, ltc4555 Datasheet

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ltc4555

Manufacturer Part Number
ltc4555
Description
Sim Power Supply And Level Translator
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
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
Available in 0.75mm Profile, 3mm × 3mm
QFN Package
SIM Interface in 3G Cellular Telephones
Smart Card Readers
U
CONTROLLER
SD
U
< 1µA)
V
CC
0.1µF
(1.2V TO 4.4V)
Typical SIM Interface
SHDN
V
R
C
DATA
DV
SEL
IN
IN
CC
LTC4555
GND
(3V TO 6V)
DESCRIPTIO
The LTC
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 voltage
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.
All other trademarks are the property of their respective owners.
V
V
BAT
BAT
RST
CLK
V
, LTC and LT are registered trademarks of Linear Technology Corporation.
I/0
CC
®
4555 provides power conversion and signal level
0.1µF
1µF
and Level Translator
V
RST
CLK
I/0
GND
SMART CARD
CC
INTERFACE
SIM/
SIM Power Supply
U
4555 TA01
LTC4555
4555fa
1

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ltc4555 Summary of contents

Page 1

... All other trademarks are the property of their respective owners. Typical SIM Interface V BAT (1.2V TO 4.4V) ( 0.1µF 0.1µ BAT SHDN SEL LTC4555 R RST IN C CLK IN DATA I/0 GND LTC4555 SIM Power Supply and Level Translator U SIM/ SMART CARD INTERFACE V CC 1µF RST CLK I/0 GND 4555 TA01 4555fa 1 ...

Page 2

... PACKAGE/ORDER I FOR ATIO + 0. JMAX ORDER PART NUMBER LTC4555EUD Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. The ● ...

Page 3

... Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC4555E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the – 40°C to 85°C operating The ● ...

Page 4

... Supply Voltage for the Controller Side I/O CC Pins ( DATA). When below 1.1V, the disabled, placing the LTC4555 in shutdown mode. This pin should be bypassed with a 0.1µF ceramic capacitor close to the pin. NC (Pins 4, 6, 12, 16): No Connect. V (Pin 5): V Supply Input. This pin can be between 3V ...

Page 5

... FROM SIM CELL PHONE PROCESSOR INTERFACE V BAT ( BAT SHDN 1 50mA LDO V SEL 2 R RST CLK IN 13 20k 10k DATA I/0 15 LTC4555 GND 10 LTC4555 C2 0.1µ 1.8V/ 50mA C1 1µF 9 RESET 11 CLOCK BIDIRECTIONAL 8 I/O SIM/ SMART CARD INTERFACE 4555 BD 4555fa 5 ...

Page 6

... On-chip pull-up resistors are provided for both the DATA and I/O lines. Shutdown Modes The LTC4555 can enter a low current shutdown mode by one of two methods. First, the SHDN pin is an active low pin. The output SEL input that the controller can use to directly shut down the part ...

Page 7

... Plastic QFN (3mm × 3mm) (Reference LTC DWG # 05-08-1691) 0.70 ±0.05 PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0.05 3.00 ± 0.10 (4 SIDES) 1.45 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LTC4555 BOTTOM VIEW—EXPOSED PAD PIN 1 NOTCH R = 0.20 TYP R = 0.115 OR 0.25 × 45° CHAMFER TYP 15 16 0.40 ± 0. (UD16) QFN 0904 0.25 ± 0.05 0.50 BSC ...

Page 8

... LTC4555 RELATED PARTS PART NUMBER DESCRIPTION LTC1514 50mA, 650kHz, Step-Up/Down Charge Pump with Low Battery Comparator LTC1515 50mA, 650kHz, Step-Up/Down Charge Pump with Power On Reset LTC1555/LTC1556 650kHz,SIM Power Supply and Level Translator for 3V/5V SIM Cards LTC1555L 1MHz, SIM Power Supply and Level Translator for 3V/5V SIM Cards LTC1555L-1 ...

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