LTC1555IGN datasheet(3/12 Pages) LINER

3 / 12 page

LTC1555/LTC1556

VIN = 2.7V to 10V, DVCC = 1.8V to 5.5V, controller digital pins tied to DVCC, SIM digital pins floating, EN, FB pins tied to GND

(LTC1556), C1 = 0.1

µF, COUT = 10µF unless otherwise specified.

ELECTRICAL CHARACTERISTICS

over the – 40

°C to 85°C temperature range by design or correlation, but

are not production tested.

Note 3: The DATA and I/O pull-down drivers must also sink current

sourced by the internal pull-up resistors.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC Short-Circuit Current

VCC Shorted to GND

12.5

Auxiliary LDO VOUT (VLDO)

EN = High, VCC = 5V, FB = LDO, ILDO = 5mA (LTC1556)

4.00

4.3

4.55

Auxiliary Switch Resistance

EN = High, VCC = 5V, FB = GND (LTC1556)

Ω

FB Input Resistance

(LTC1556)

200

Ω

Charge Pump fOSC

500

650

800

kHz

Controller Inputs/Outputs, DVCC = 3V

Input Current (IIH, IIL)

M0, M1, SS, RIN, CIN

–1

µA

DDRV, EN

–5

µA

High Level Input Current (IIH)

DATA

–20

µA

Low Level Input Current (IIL)

DATA

1mA

High Input Voltage Threshold (VIH)

M0, M1, RIN, CIN, DDRV, EN

0.7

× DVCC

DATA

DVCC – 0.6

Low Input Voltage Threshold (VIL)

M0, M1, RIN, CIN, DDRV, EN

0.2

× DVCC

DATA

0.4

High Level Output Voltage (VOH)

DATA Source Current = 20

µA, I/O = VCC

0.7

× DVCC

Low Level Output Voltage (VOL)

DATA Sink Current = – 200

µA, I/O = 0V (Note 3)

0.4

DATA Pull-up Resistance

Between DATA and DVCC

Ω

DATA Output Rise/Fall Time

DATA Loaded with 30pF

1.3

µs

SIM Inputs/Outputs, DVCC = 3V, VCC = 3V or 5V

I/O High Input Voltage Threshold (VIH)IIH(MAX) = ±20µA

0.5

× VCC 0.7 × VCC

I/O Low Input Voltage Threshold (VIL)IIL(MAX) = 1mA

0.4

High Level Output Voltage (VOH)

I/O, Source Current = 20

µA, DATA or DDRV = DVCC

0.8

× VCC

RST, CLK, Source Current = 20

µA

0.9

× VCC

Low Level Output Voltage (VOL)

I/O, Sink Current = – 1mA, DATA or DDRV = 0V (Note 3)

0.4

RST, CLK, Sink Current = – 200

µA

0.4

I/O Pull-Up Resistance

Between I/O and VCC

6.5

Ω

SIM Timing Parameters, DVCC = 3V, VCC = 5V

CLK Rise/Fall Time

CLK Loaded with 30pF

RST, I/O Rise/Fall Time

RST, I/O Loaded with 30pF

µs

CLK Frequency

CLK Loaded with 30pF

MHz

VCC Turn-On Time

SS = DVCC, COUT = 10µF, IVCC = 0

SS = 0V, COUT = 10µF, IVCC = 0

VCC Discharge Time to 1V

IVCC = 0, VCC = 5V, COUT = 10µF3

The q denotes specifications which apply over the specified temperature

range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: C grade device specifications are guaranteed over the 0

°C to 70°C

temperature range. In addition, C grade device specifications are assured

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