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LTC4555 SIM Power Supply and Level Translator
FEATURES
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DESCRIPTIO
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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 20A Operating Current Logic Controlled Shutdown (ISD < 1A) Available in 0.8mm Tall, 3mm x 3mm QFN Package
The LTC(R)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 requirements 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 20A operating current and <1A shutdown current. Board area is minimized by the 3mm x 3mm leadless QFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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SIM Interface in 3G Cellular Telephones Smart Card Readers
TYPICAL APPLICATIO
Typical SIM Interface
(1.2V TO 4.4V) VCC 0.1F DVCC SHDN CONTROLLER VSEL LTC4555 RIN CIN DATA GND GND
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VBAT (3V TO 6V) 0.1F VBAT VCC 1F RST CLK I/0 RST CLK I/0 VCC SIM/ SMART CARD INTERFACE
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LTC4555
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC
VBAT
VCC
I/O
VBAT, DVCC, 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 ................................... Infinite Operating Temperature Range (Note 2) .. - 40C to 85C Storage Temperature Range ................. - 65C to 125C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER
12 NC 11 CLK 10 GND 9 RST
DATA
RIN
16 15 14 13 SHDN 1 VSEL 2 DVCC 3 NC 4 5 6 7 8
CIN
NC
LTC4555EUD
PART MARKING LAAA
UD PACKAGE 16-LEAD (3mm x 3mm) PLASTIC QFN EXPOSED PAD IS GND (MUST BE SOLDERED TO PCB) TJMAX = 125C, JA = 68C/W, JC = 4.2C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C.
PARAMETER VBAT Operating Voltage VBAT Operating Current VBAT Shutdown Current DVCC Operating Voltage DVCC Operating Current DVCC Shutdown Current DVCC Undervoltage Lockout VCC Output Voltage fCLK = 1MHz SHDN = 0V ICC = 0mA SHDN = 0V CONDITIONS
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ELECTRICAL CHARACTERISTICS
MIN 3
TYP 20
MAX 6 30 1 4.4
UNITS V A A V A A V V V V mA V nA V V V V A mA V V V
1.2 5 0.5 2.8 1.7 60 0 2.8 3.0 1.8 110
10 1 1.1 3.2 1.9 175 DVCC 100 0.7 x DVCC
VSEL = DVCC, VBAT = 3V, IVCC = 50mA VSEL = DVCC, VBAT = 3.3V to 6V, IVCC = 0mA to 50mA q VSEL = 0, VBAT = 2.6V to 6V, IVCC = 0mA to 50mA q VCC Shorted to GND SHDN, VSEL, RIN, CIN, DATA SHDN, VSEL, RIN, CIN RIN, CIN RIN, CIN SHDN, VSEL SHDN, VSEL DATA DATA DATA DATA DATA IOH = 20A, I/O = VCC DATA IOL = -200A, I/O = 0V Between DATA and DVCC
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VCC Short-Circuit Current Controller Inputs/Outputs Input Voltage Range Input Current ( IIH/IIL) High Input Threshold Voltage (VIH) Low Input Threshold Voltage (VIL) High Input Threshold Voltage (VIH) Low Input Threshold Voltage (VIL) High Level Input Current (IIH) Low Level Input Current (IIL) High Input Threshold Voltage (VIH) Low Input Threshold Voltage (VIL) High Level Output Voltage (VOH) Low Level Output Voltage (VOL) DATA Pull-Up Resistance
-100 0.2 x DVCC
1 0.4 -20 20 1 DVCC - 0.6 0.4 0.7 x DVCC 0.4 13 20 30
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LTC4555
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C.
PARAMETER SIM Inputs/Outputs (VCC = 3V) High Level Input Voltage (VIH) Low Level Input Voltage (VIL) High Level Output Voltage (VOH) Low Level Output Voltage (VOL) High Level Output Voltage (VOH) Low Level Output Voltage (VOL) I/O Pull-Up Resistance SIM Inputs/Outputs (VCC = 1.8V) High Level Input Voltage (VIH) Low Level Input Voltage (VIL) High Level Output Voltage (VOH) Low Level Output Voltage (VOL) High Level Output Voltage (VOH) Low Level Output Voltage (VOL) I/O Pull-Up Resistance SIM Timing Parameters CLK Rise/Fall Time RST, I/O Rise/Fall Time Max CLK Frequency VCC Turn-On Time VCC Discharge Time to 1V SHDN = 1, (Note 3) SHDN = 0, (Note 3) CCLK = 30pF, VCC = 3V CCLK = 30pF, VCC = 1.8V RST,I/O Loaded with 30pF, VCC = 1.8V/3V
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ELECTRICAL CHARACTERISTICS
CONDITIONS I/O, IIH = 20A I/O, IIL = 1mA I/O, IOH = 20A, DATA =DVCC I/O, IOL = -200A, DATA = 0V RST, CLK, IOH = 20A RST, CLK, IOL = -200A Between I/O and VCC I/O, IIH = 20A I/O, IIL = 1mA I/O, IOH = 20A, DATA = DVCC I/O, IOL = -200A, DATA = 0V RST, CLK, IOH = 20A RST, CLK, IOL = -200A Between I/O and VCC
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MIN
TYP
MAX 0.7 x VCC
UNITS V V V
0.4 0.8 x VCC 0.4 0.9 x VCC 0.4 6.5 10 14 0.7 x VCC 0.2 x VCC 0.8 x VCC 0.4 0.9 x VCC 0.2 x VCC 6.5 10 14 18 50 1 5 0.5 0.5
V V V k V V V V V V k ns ns s MHz ms ms
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC4555E is guaranteed to meet performance specifications from 0C to 70C. Specifications over the - 40C to 85C operating
temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Specification is guaranteed by design and not 100% tested in production.
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LTC4555 TYPICAL PERFOR A CE CHARACTERISTICS
VCC Short-Circuit Current
170 SHORT-CIRCUIT CURRENT (mA) 150 130
IBAT (A)
110 90 70 50 -40 -20
40 20 60 0 TEMPERATURE (C)
PI FU CTIO S
SHDN (Pin 1): Controller Driven Shutdown Pin. This pin should be high (DVCC) for normal operation and low to activate a low current shutdown mode. VSEL (Pin 2): VCC Voltage Select Pin. A low level selects VCC = 1.8V while driving this pin to DVCC selects VCC = 3V. DVCC (Pin 3): Supply Voltage for the Controller Side I/O Pins (CIN, RIN, DATA). When below 1.1V, the VCC supply is disabled, placing the LTC4555 in shutdown mode. This pin should be bypassed with a 0.1F ceramic capacitor close to the pin. NC (Pins 4, 6, 12, 16): No Connect. VBAT (Pin 5): VCC Supply Input. This pin can be between 3V and 6V for normal operation. VBAT quiescent current reduces to <1A in shutdown. This pin should be bypassed with a 0.1F ceramic capacitor close to the pin. VCC (Pin 7): SIM Card VCC Supply. A 1F low ESR capacitor needs to be connected close to the VCC pin for stable operation. This pin is discharged to GND during shutdown. I/O (Pin 8): SIM-Side Data I/O. The SIM card output must be on an open drain driver capable of sourcing >1mA. RST (Pin 9): Reset Output Pin for the SIM Card. GND (Pin 10): Ground for the SIM and Controller. Proper grounding and bypassing is required to meet 14kV ESD specifications. Exposed pad must also be connected to GND. CLK (Pin 11): Clock Output Pin for the SIM Card. This pin is pulled to ground during shutdown. Fast rising and falling edges necessitate careful board layout for the CLK node. CIN (Pin 13): Clock Input from the Controller. RIN (Pin 14): Reset Input from the Controller. DATA (Pin 15): Controller Side Data I/O. This pin is used for bidirectional data transfer. The controller output must be an open-drain configuration. The open-drain output must be capable of sinking greater than 1mA.
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IBAT vs VBAT
22 VCC = 3V 20 TA = 25C 18 16 14 12 10 2.5 TA = 85C TA = -40C TA = 85C VCC = 1.8V TA = 25C TA = -40C
80
100
3.0
3.5
4.0 4.5 VBAT (V)
5.0
5.5
6.0
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LTC4555
BLOCK DIAGRA W
VBAT (3V TO 6V) PROCESSOR VCC C3 0.1F SHUTDOWN PIN VSIM VOLTAGE SELECT RESET FROM PROCESSOR CLOCK FROM PROCESSOR 1 SHDN 3 DVCC 5 VBAT VCC 50mA LDO 7 C2 0.1F 1.8V/3V AT 50mA 2 VSEL C1 1F 14 RIN RST 9 RESET 13 CIN 20k DATA TO/ FROM SIM 15 DATA 10k I/0 8 BIDIRECTIONAL I/O CLK 11 CLOCK LTC4555 10 GND SIM/ SMART CARD INTERFACE
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CELL PHONE PROCESSOR INTERFACE
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LTC4555
APPLICATIO S I FOR ATIO
The LTC4555 provides both regulated power and internal level translators to allow low voltage controllers to interface with 1.8V or 3V SIMs or smart cards. The part meets all ETSI, IMT-2000 and ISO7816 requirements for SIM and smart card interfaces. VCC Voltage Regulator The VCC voltage regulator is a 50mA low dropout (LDO) regulator with a digitally selected 1.8V or 3V output. The output voltage is selected via the VSEL pin. The output is internally current limited and is capable of surviving an indefinite short to GND. The VCC output should be bypassed with a 1F capacitor. The LTC4555 can use either a low ESR ceramic capacitor or a tantalum electrolytic capacitor on the VCC pin, with no special ESR requirements. VBAT should be bypassed with a 0.1F ceramic capacitor. Level Translators All SIMs and smart cards contain a clock input, a reset input and a bidirectional data input/output. The LTC4555 provides level translators to allow controllers to commuShutdown Modes The LTC4555 can enter a low current shutdown mode by one of two methods. First, the SHDN pin is an active low input that the controller can use to directly shut down the part. The other way is to lower DVCC below 1.1V at which point and undervoltage lockout circuit puts the part into shutdown mode. ESD Protection All pins that connect to the SIM/smart card will withstand 14kV of human body model ESD. In order to ensure proper ESD protection, careful board layout is required. The GND pin should be tied directly to a GND plane. The VCC capacitor should be located very close to the VCC pin and tied directly to the GND plane.
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nicate with the SIM. The CLK and RST lines to the SIM are level shifted from the controller supply (GND to DVCC) to the SIM supply (GND to VCC). The data input to the SIM requires an open-drain output on the controller. On-chip pull-up resistors are provided for both the DATA and I/O lines.
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LTC4555
PACKAGE DESCRIPTIO U
UD Package 16-Lead Plastic QFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1691)
0.57 0.05 PACKAGE OUTLINE 0.23 0.05 0.50 BCS RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.75 0.05 BOTTOM VIEW--EXPOSED PAD R = 0.115 TYP 15 16 0.40 0.10 3.00 0.10 (4 SIDES) PIN 1 TOP MARK 1 1.45 0.10 (4-SIDES) 2
(UD) QFN 0802
3.35 0.05 1.45 0.05 2.20 0.05 (4 SIDES)
0.200 REF 0.00 - 0.05 NOTE: 1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2) 2. ALL DIMENSIONS ARE IN MILLIMETERS 3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 4. EXPOSED PAD SHALL BE SOLDER PLATED
0.23 0.05 0.50 BSC
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC4555
RELATED PARTS
PART NUMBER LTC1514 LTC1515 LTC1555/LTC1556 LTC1555L LTC1555L-1.8 LTC1755/LTC1756 LTC1955 LTC1986 LTC3250-1.5 LTC3251 DESCRIPTION 50mA, 650kHz, Step-Up/Down Charge Pump with Low Battery Comparator 50mA, 650kHz, Step-Up/Down Charge Pump with Power On Reset 650kHz,SIM Power Supply and Level Translator for 3V/5V SIM Cards 1MHz, SIM Power Supply and Level Translator for 3V/5V SIM Cards 1MHz, SIM Power Supply and Level Translator for 1.8V/3V/5V SIM Cards Smart Card Interface with Serial Control for 3V/5V Smart Card Applications Dual Smart Card Interface with Serial Control for 1.8V/3V/5V Smart Card Applications 900kHz, SIM Power Supply for 3V/5V SIM Cards 250mA,1.5MHz, High Efficiency Step-Down Charge Pump 500mA,1MHz-16MHz, Spread Spectrum, Step-Down Charge Pump COMMENTS VIN = 2.7V to 10V, VOUT = 3V/5V, IQ = 60A, ISD = 10A, S8 Package VIN = 2.7V to 10V, VOUT = 3.3V or 5V, IQ = 60A, ISD = <1A, S8 Package VIN = 2.7V to 10V, VOUT = 3V/5V, IQ = 60A, ISD = <1A, SSOP-16, SSOP-20 Packages VIN = 2.6V to 6.6V, VOUT = 3V/5V, IQ = 40A, ISD = <1A, SSOP-16 Package VIN = 2.6V to 6.6V, VOUT = 1.8V/3V/5V, IQ = 32A, ISD = <1A, SSOP-16 Package VIN = 2.7V to 7V, VOUT = 3V/5V, IQ = 60A, ISD = <1A, SSOP-16, SSOP-24 Packages VIN = 3V to 6V, VOUT = 1.8V/3V, IQ = 200A, ISD = <1A, QFN-32 Package VIN = 2.6V to 4.4V, VOUT = 3V/5V, IQ = 14A, ISD = <1A, ThinSOT Package 85% Efficiency, VIN = 3.1V to 5.5V, VOUT = 1.5V, IQ = 35A, ISD = <1A, ThinSOT Package 85% Efficiency, VIN = 3.1V to 5.5V, VOUT = 0.9V to 1.6V, IQ = 9A, ISD = <1A, MS Package
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
LT/TP 0503 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2001

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