5V-to-3.3V, Synchronous, Step-Down

Power-Supply Controller

_______________________________________________________________________________________

3

100

50

0.001

0.1

10

EFFICIENCY vs. OUTPUT CURRENT

(1.5A CIRCUIT)

60

OUTPUT CURRENT (A)

70

80

90

0.01

1

100

50

0.001

0.1

10

EFFICIENCY vs. OUTPUT CURRENT

(3A CIRCUIT)

60

OUTPUT CURRENT (A)

70

80

90

0.01

1

100

50

0.001

0.1

10

EFFICIENCY vs. OUTPUT CURRENT

(5A CIRCUIT)

60

OUTPUT CURRENT (A)

70

80

90

0.01

1

100

50

0.001

0.1

10

EFFICIENCY vs. OUTPUT CURRENT

(7A CIRCUIT)

60

OUTPUT CURRENT (A)

70

80

90

0.01

1

IDLE-MODE WAVEFORMS

3.3V OUTPUT

50mV/div, AC COUPLED

LX

5V/div

5µs/div

100

50

0.001

0.1

10

EFFICIENCY vs. OUTPUT CURRENT

(10A CIRCUIT)

60

OUTPUT CURRENT (A)

70

80

90

0.01

1

1000

0.01

0.001

1

100

SWITCHING FREQUENCY vs.

PERCENT OF FULL LOAD

0.1

LOAD CURRENT (% FULL LOAD)

1

10

100

0.01

0.1

10

SYNC = REF (300kHz)

PWM-MODE WAVEFORMS

3.3V OUTPUT

50mV/div, AC COUPLED

LX

5V/div

1µs/div

__________________________________________Typical Operating Characteristics