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Linear Technology Electronic Components Datasheet

LTC1555L Datasheet

SIM Power Supply and Level Translator

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LTC1555L pdf
FEATURES
s Buck/Boost Charge Pump Generates 3V or 5V
s Input Voltage Range: 2.6V to 6V
s Controller VCC Range: 1.425V to 4.4V
s >10kV ESD on All SIM Contact Pins
s Short-Circuit and Overtemperature Protected
s 3V to 5V Signal Level Translators
s Very Low Operating Current: 40µA
s Very Low Shutdown Current: <1µA
s Soft-Start Limits Inrush Current at Turn-On
s 1MHz Switching Frequency
s Available in 16-Pin Narrow SSOP Package
U
APPLICATIO S
s SIM Interface in GSM Cellular Telephones
s Smart Card Readers
LTC1555L
SIM Power Supply and
Level Translator
DESCRIPTIO
The LTC®1555L provides power conversion and level
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 VCC
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 VIN pin.
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 40µA operating current, and
1µA shutdown current. Board area is minimized by the
miniature 16-pin narrow SSOP packages and the need for
only three small external capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*U.S. Patent No.: 5,973,944
TYPICAL APPLICATIO
GSM Cellular Telephone SIM Interface
GSM
CONTROLLER
VCC
1.425V TO 4.4V
LTC1555L
1
CIN
2
RIN
3
DATA
4
DDRV
5
DVCC
6
N/C
7
M1
8
M0
16
CLK
15
RST
14
I/O
13
VCC
12
VIN
C1+ 11
C110
9
GND
VIN
2.6V TO 6V
0.1µF
1µF
SIM
CLK
RST
I/O
VCC
IVCC = 10mA
2.2µF
GND
OUTPUT VOLTAGE
MODES
VCC = 3V
VCC = 5V
VCC* = VIN
*ACTUAL VCC WILL
DEPEND ON OUTPUT
CURRENT IN THIS MODE
1555L TA01
1


Linear Technology Electronic Components Datasheet

LTC1555L Datasheet

SIM Power Supply and Level Translator

No Preview Available !

LTC1555L pdf
LTC1555L
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, DVCC to GND ..................................... –0.3V to 6.5V
VCC to GND ...............................................– 0.3V to 6.5V
Digital Inputs to GND ................................– 0.3V to 6.5V
CLK, RST, I/O to GND ..................... – 0.3V to VCC + 0.3V
VCC Short-Circuit Duration ............................... Indefinite
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering,10 sec)................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CIN 1
RIN 2
DATA 3
DDRV 4
DVCC 5
N/C 6
M1 7
M0 8
16 CLK
15 RST
14 I/0
13 VCC
12 VIN
11 C1+
10 C1
9 GND
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 150°C/W
ORDER PART
NUMBER
LTC1555LEGN
GN PART MARKING
1555L
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (VIN = 2.6V to 6V, DVCC = 1.425V to 4.4V, controller digital pins tied to
DVCC, SIM digital pins floating, C1 = 0.1µF, COUT = 2.2µF unless otherwise noted)
PARAMETER
VIN Operating Voltage
DVCC Operating Voltage
DVCC Undervoltage Lockout
VIN Operating Current
VIN Shutdown Current
DVCC Operating Current
DVCC Shutdown Current
VCC Output Voltage
VCC Short-Circuit Current
Charge Pump fOSC
CONDITIONS
VCC = 5V, IVCC = 0V
M0, M1 = 0V
M0, M1, DATA = DVCC, CIN = 1MHz
M0, M1 = 0V, DATA, CIN = DVCC
0 < IVCC < 10mA
M0, M1 = DVCC, 2.6V < VIN < 6V
M0, M1 = DVCC, 2.7V < VIN < 6V
M0 = DVCC, M1 = 0
M0 = 0, M1 = DVCC
VCC Shorted to GND
MIN
q 2.6
q 1.425
q
q
q
q
TYP
1.2
35
5
q 4.55
q 4.75
q 2.8
q VIN – 0.2
q
5
5
3
50
1
MAX UNITS
6V
4.4 V
V
65 µA
1 µA
30 µA
1 µA
5.25 V
5.25 V
3.2 V
VIN V
150 mA
MHz
2


Part Number LTC1555L
Description SIM Power Supply and Level Translator
Maker Linear
Total Page 8 Pages
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LTC1555L pdf
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