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LTC3544

3544fa

μs/DIV

VOUT300

50mV/DIV

COUPLED

100mA/DIV

SW300

5V/DIV

3544 G04

VIN = 3.6V

VOUT = 1.8V

TA = 25°C

ILOAD = 20mA

Burst Mode Operation

300mA Channel

Burst Mode Operation

200mA, A-B Channels

Burst Mode Operation

100mA Channel

VREF vs Temperature at 2.25V,

3.6V, 5.5V

Switching Frequency vs Supply

Voltage and Temperature

Efﬁciency vs Load Current 300mA

Channel. All Other Channels at

50% Peak Current

TEMPERATURE (

°C)

–50

0.785

0.790

0.795

0.800

0805

0.810

0.815

100

3544 G01

VIN = 2.25V

VIN = 3.6V

VIN = 5.5V

CHANNEL 200A

ILOAD = 100mA

ALL CHANNELS OPERATING

SUPPLY VOLTAGE (V)

1.5

2.0

2.5

3.0

3544 G02

fOSC –40°C

fOSC 0°C

fOSC 25°C

fOSC 80°C

ILOAD CHANNEL 100 = 50mA

ALL CHANNELS OPERATING

LOAD CURRENT 300mA CHANNEL (A)

100

0.0001

0.01

0.1

3544B G03

0.001

VIN = 3.6V

TA = 25°C

VOUT100 = 1.2V

VOUT200A = 0.8V

VOUT200B = 1.5V

VOUT300 = 1.8V

ALL OTHER CHANNELS LOADED 50%

μs/DIV

VOUT200B

50mV/DIV

COUPLED

50mA/DIV

SW2B

5V/DIV

3544 G05

VIN = 3.6V

VOUT = 1.5V

TA = 25°C

ILOAD = 15mA

μs/DIV

VOUT100

50mV/DIV

COUPLED

50mA/DIV

SW100

5V/DIV

3544 G06

VIN = 3.6V

VOUT = 1.2V

TA = 25°C

ILOAD = 12mA

TYPICAL PERFORMANCE CHARACTERISTICS

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD)(68°C/W).

Note 4: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

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

operation above the speciﬁed maximum operating junction temperature

may impair device reliability.

Note 5: The LTC3544 is tested in a proprietary test mode that connects VFB

to the output of the error ampliﬁer.

Note 6: Load regulation is inferred by measuring the regulation loop gain.

Note 7: The QFN switch on-resistance is guaranteed by correlation to wafer

level measurements.

Note 8: Guaranteed by long-term current density limitations.

ELECTRICAL CHARACTERISTICS

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