Dual-Output Power-Supply

Controller for Notebook Computers

4

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________________________________________________Typical Operating Characteristics

EFFICIENCY vs. +5V OUTPUT

CURRENT, 300kHz

50

60

70

80

90

100

1m

10m

100m

1

10

+5V OUTPUT CURRENT (A)

VIN = 6V

VIN = 15V

VIN = 30V

+3.3V OFF

EFFICIENCY vs. +3.3V OUTPUT

CURRENT, 200kHz

50

60

70

80

90

100

1m

10m

100m

1

10

+3.3V OUTPUT CURRENT (A)

VIN = 6V

VIN = 15V

VIN = 30V

SYNC = 0V, +5V ON

EFFICIENCY vs. +3.3V OUTPUT

CURRENT, 300kHz

50

60

70

80

90

100

1m

10m

100m

1

10

+3.3V OUTPUT CURRENT (A)

VIN = 6V

VIN = 15V

VIN = 30V

+5V ON

SHUTDOWN SUPPLY CURRENT vs.

SUPPLY VOLTAGE

0

100

200

300

400

500

0

6

12

18

24

30

SUPPLY VOLTAGE (V)

SHDN = 0V

QUIESCENT SUPPLY CURRENT vs.

SUPPLY VOLTAGE

0

1

2

18

19

0

6

12

18

24

30

SUPPLY VOLTAGE (V)

ON3 = ON5 = HIGH

STANDBY SUPPLY CURRENT vs.

SUPPLY VOLTAGE

0

0.5

1.0

1.5

2.0

2.5

0

6

12

18

24

30

ON3 = ON5 = 0V

SUPPLY VOLTAGE (V)

MINIMUM VIN TO VOUT DIFFERENTIAL

vs. +5V OUTPUT CURRENT

+5V OUTPUT CURRENT (A)

0

0.2

0.4

0.6

0.8

1.0

1m

10m

100m

1

10

300kHz

200kHz

+5V OUTPUT

STILL REGULATING

EFFICIENCY vs. +5V OUTPUT

CURRENT, 200kHz

50

60

70

80

90

100

1m

10m

100m

1

10

+5V OUTPUT CURRENT (A)

VIN = 6V

VIN = 30V

VIN = 15V

SYNC = 0V, +3.3V OFF

1000

0.1

100

µ

10m

1

SWITCHING FREQUENCY vs.

LOAD CURRENT

10

LOAD CURRENT (A)

100

1m

100m

SYNC = REF (300kHz)

ON3 = ON5 = 5V

1