LTC3577 datasheet(7/38 Pages) LINER

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LTC3675

3675fa

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 3.6V. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tBUF

Bus Free Time Between Stop and Start

Condition

1.3

μs

tHD_SDA

Hold Time After Repeated Start Condition

0.6

μs

tSU_STA

Repeated Start Condition Set-Up Time

0.6

μs

tSU_STO

Stop Condition Set-Up Time

0.6

μs

tHD_DAT(O)

Data Hold Time Output

900

tHD_DAT(I)

Data Hold Time Input

tSU_DAT

Data Set-Up Time

100

tLOW

SCL Clock Low Period

1.3

μs

tHIGH

SCL Clock High Period

0.6

μs

Clock/Data Fall Time

CB = Capacitance of One Bus Line (pF)

20+0.1CB

300

Clock/Data Rise Time

CB = Capacitance of One Bus Line (pF)

20+0.1CB

300

tSP

Input Spike Suppression Pulse Width

Interface Logic Pins (PBSTAT, WAKE, RSTB, IRQB, ONB)

ILK(HIGH)

Output High Leakage Current

3.6V at Pin

–1

μA

VOL

Output Low Voltage

3mA into Pin

100

400

VONB(HIGH)

ONB High Threshold

800

1200

VONB(LOW)

ONB Low Threshold

400

700

Interface Logic Pins (EN1, EN2, EN3, EN4, ENBB)

VHI_ALLOFF

Enable Rising Threshold

All Regulators and LED Driver Disabled

400

650

1200

VEN_HYS

Enable Falling Hysteresis

VHI

Enable Rising Threshold

At Least One Regulator/LED Driver Enabled

380

400

420

IEN

Enable Pin Leakage Current

EN = 3.6V

–1

μA

Pushbutton Parameters; CT = 0.01μF

tONB_LO

ONB Low Time to PBSTAT Low

WAKE High

tONB_WAKE

ONB Low Time to WAKE High

280

400

520

tONB_HR

ONB Low to Hard Reset

3.5

6.5

sec

tHR

Time for Which All Enabled Regulators are

Disabled

0.7

1.3

sec

tPBSTAT_PW

PBSTAT Minimum Pulse Width

tWAKE_ON

WAKE High Time

3.5

6.5

sec

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3675 is tested under pulsed load conditions such that

TA ≈ TJ. The LTC3675 is guaranteed to meet performance speciﬁcations

from 0°C to 125°C. Speciﬁcations over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 3: The LTC3675 includes overtemperature protection which protects

the device during momentary overload conditions. Junction temperature

will exceed 125°C when overtemperature protection is active. Continuous

operation above the speciﬁed maximum operating junction temperature

may impair device reliability.

Note 4: Static current, switches not switching. Actual current may be

higher due to gate charge losses at the switching frequency.

Note 5: Currents measured at a speciﬁc VIN pin. Buck 1 (VIN, Pin 6);

Buck 2 (VIN, Pin 7); Buck 3 and Buck 4 (VIN, Pin 10); Boost and Buck

Boost (VIN, Pin 34); LED driver (VIN, Pin 31).

Note 6: The current limit features of this part are intended to protect the

IC from short term or intermittent fault conditions. Continuous operation

above the maximum speciﬁed pin current rating may result in device

degradation over time.

Note 7: With dual string operation, the LED pin with the lower voltage sets

the regulation point.

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