LTC3544

4

3544fa

2

μs/DIV

50mV/DIV

AC

COUPLED

100mA/DIV

SW300

5V/DIV

3544 G04

Burst Mode Operation

300mA Channel

Burst Mode Operation

200mA, A-B Channels

Burst Mode Operation

100mA Channel

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

0

50

100

3544 G01

CHANNEL 200A

ALL CHANNELS OPERATING

SUPPLY VOLTAGE (V)

2

1.5

2.0

2.5

3.0

34

3544 G02

56

ALL CHANNELS OPERATING

LOAD CURRENT 300mA CHANNEL (A)

30

90

100

20

10

80

50

70

60

40

0.0001

0.01

0.1

1

3544B G03

0

0.001

ALL OTHER CHANNELS LOADED 50%

2

μs/DIV

50mV/DIV

AC

COUPLED

50mA/DIV

SW2B

5V/DIV

3544 G05

2

μs/DIV

50mV/DIV

AC

COUPLED

50mA/DIV

SW100

5V/DIV

3544 G06

TYPICAL PERFORMANCE CHARACTERISTICS

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.

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