LTC3547 datasheet(3/16 Pages) LINER

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LTC3547

3547fa

VIN (V)

2.5

100

3547 G02

3.5

4.5

5.5

VOUT = 1.8V

IOUT = 0.1mA

IOUT = 1mA

IOUT = 10mA

IOUT = 100mA

IOUT = 300mA

TEMPERATURE (ºC)

–50

3547 G03

–25

100

RUN1 = RUN2 = VIN

ILOAD = 0A

VIN = 5.5V

VIN = 2.7V

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RDS(ON)

Channel 1 (Note 4)

Top Switch On-Resistance

Bottom Switch On-Resistance

Channel 2 (Note 4)

Top Switch On-Resistance

Bottom Switch On-Resistance

VIN = 3.6V, ISW = 100mA

0.8

0.75

0.8

0.75

1.05

ISW(LKG)

Switch Leakage Current

VIN = 5V, VRUN = 0V

0.01

µA

tSOFTSTART

Soft-Start Time

VFB From 10% to 90% Full-Scale

0.450

0.650

0.850

VRUN

RUN Threshold High

●

0.4

1.2

IRUN

RUN Leakage Current

●

0.01

µA

VBURST

Output Ripple in Burst Mode Operation

VOUT = 1.5V, COUT = 4.7µF

mVP-P

The ● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VCC = 3.6V, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

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 LTC3547E is guaranteed to meet speciﬁed performance

from 0°C to 85°C. Speciﬁcations over the –40°C and 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

Note 4: The DFN switch on-resistance is guaranteed by correlation to

wafer level measurements.

Note 5: Guaranteed by long term current density limitations.

Note 6: This IC includes overtemperature protection that is intended

to protect 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.

Burst Mode Operation

Efﬁciency vs Input Voltage

Supply Current vs Temperature

TYPICAL PERFOR A CE CHARACTERISTICS

2.5

µs/DIV

VOUT

50mV/DIV

50mA/DIV

SW, AC

COUPLED

5V/DIV

3547 G01

VIN = 3.6V

VOUT = 1.8V

ILOAD = 20mA

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