ltc1555l Linear Technology Corporation, ltc1555l Datasheet

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ltc1555l

Manufacturer Part Number
ltc1555l
Description
Sim Power Supply And Level Translator
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Buck/Boost Charge Pump Generates 3V or 5V
Input Voltage Range: 2.6V to 6V
Controller V
>10kV ESD on All SIM Contact Pins
Short-Circuit and Overtemperature Protected
3V to 5V Signal Level Translators
Very Low Operating Current: 40 A
Very Low Shutdown Current: <1 A
Soft-Start Limits Inrush Current at Turn-On
1MHz Switching Frequency
Available in 16-Pin Narrow SSOP Package
SIM Interface in GSM Cellular Telephones
Smart Card Readers
CC
CONTROLLER
Range: 1.425V to 4.4V
GSM
U
V
CC
1.425V TO 4.4V
U
1
2
3
4
5
6
7
8
CIN
RIN
DATA
DDRV
DV
N/C
M1
M0
CC
LTC1555L
GSM Cellular Telephone SIM Interface
GND
CLK
RST
C1
C1
V
V
I/O
CC
IN
+
16
15
14
13
12
11
10
9
0.1 F
2.6V TO 6V
DESCRIPTIO
The LTC
shifting needed for low voltage GSM cellular telephones to
interface with either 3V or 5V Subscriber Identity Modules
(SIMs). The part contains a patented buck/boost charge
pump DC/DC converter* that delivers a regulated V
supply voltage to the SIM card. Input voltage may range
from 2.6V to 6V allowing direct connection to the battery.
The output voltage may be programmed to 3V, 5V or direct
connection to the V
Internal level translators allow controllers operating with
supplies as low as 1.425V to interface with 3V and 5V
SIMs. A soft-start feature limits inrush current at turn-on,
mitigating start-up problems that may result when the
input is supplied by another low-power DC/DC converter.
Battery life is maximized by 40 A operating current, and
1 A shutdown current. Board area is minimized by the
miniature 16-pin narrow SSOP packages and the need for
only three small external capacitors.
*U.S. Patent No.: 5,973,944
V
IN
, LTC and LT are registered trademarks of Linear Technology Corporation.
1 F
®
SIM Power Supply and
2.2 F
1555L provides power conversion and level
CLK
RST
I/O
V
I
GND
VCC
CC
SIM
10mA
U
IN
pin.
Level Translator
1555L TA01
*
ACTUAL V
DEPEND ON OUTPUT
CURRENT IN THIS MODE
OUTPUT VOLTAGE
V
V
V
MODES
CC
CC
CC
* = V
CC
= 3V
= 5V
WILL
IN
LTC1555L
1
CC

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ltc1555l Summary of contents

Page 1

... DATA I DDRV 2 N – GND LTC1555L Level Translator U pin. IN SIM CLK RST OUTPUT VOLTAGE MODES I 10mA VCC * = ACTUAL V WILL CC DEPEND ON OUTPUT GND CURRENT IN THIS MODE ...

Page 2

... 2.7V < V < Shorted to GND ORDER PART NUMBER 16 CLK 15 RST LTC1555LEGN 14 I PART MARKING – GND 1555L = 150 C 1.425V to 4.4V, controller digital pins tied to CC MIN TYP MAX 2 ...

Page 3

... CC Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1555LEGN is guaranteed to meet performance specifications from Specifications over the – The denotes the specifications which apply over the full operating = 25 C ...

Page 4

... Supply Voltage for Controller Side Digital CC Input/Output Pins (typically 3V). May be between 1.425V and 4.4V. The DV shutdown for further reduction in battery current. When DV drops below 1.2V, the charge pump is disabled and CC the LTC1555L goes into shutdown mode regardless of the signals on the M0-M1 pins DVCC DVCC 20 F ...

Page 5

... C1 LTC1555L STEP-UP/ STEP-DOWN CHARGE PUMP M1 DC/DC CONVERTER UVLO DV CC RIN RST CIN 20k 10k DATA 1 A DDRV GND LTC1555L with respect Output. Should be connected CC contact. The V output voltage is deter discharged OUT 2.2 F RST SIM CLK CLK ...

Page 6

... SIM and the controller. V Voltage Regulator CC The regulator section of the LTC1555L (refer to Block Diagram) consists of a buck/boost charge pump DC/DC converter. The charge pump can operate over a wide input voltage range (2.6V to 6V) while maintaining a regulated V output ...

Page 7

... However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights forces the LTC1555L into shutdown mode regardless of the status of the M0-M1 pins. 10kV ESD Protection All pins that connect to the SIM (CLK, RST, I/O, V ...

Page 8

... Smart Card Interface LTC1756 Smart Card Interface LTC1986 3V/5V SIM Power Supply in SOT-23 Linear Technology Corporation 8 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear-tech.com GSM Cellular Telephone SIM Interface V 1.425V TO 4.4V LTC1555L 2. CIN CLK 2 15 RIN RST 3 14 ...

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