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LTC4555

4555fb

TYPICAL PERFORMANCE CHARACTERISTICS

VCC Short-Circuit Current

IBAT vs VBAT

PIN FUNCTIONS

TEMPERATURE (°C)

–40

170

150

130

110

4555 G01

–20

100

TA = –40°C

VBAT (V)

2.5

4.0

5.0

4555 G02

3.0

3.5

4.5

5.5

6.0

VCC = 1.8V

VCC = 3V

TA = 25°C

TA = 85°C

TA = 25°C

TA = –40°C

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. This pin should be bypassed with a 0.1μF

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 <1μA in shutdown. This pin should be bypassed

with a 0.1μF ceramic capacitor close to the pin.

VCC (Pin 7): SIM Card VCC Supply. A 1μF low ESR capacitor

needs to be connected close to the VCC pin for stable opera-

tion. 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.

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.

Exposed Pad (Pin 17): GND. Must be soldered to PCB.

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