Triple-Output Power-Supply Controller

for Notebook Computers

_______________________________________________________________________________________

5

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

1000

0.1

100

µ

10m

1

SWITCHING FREQUENCY vs.

LOAD CURRENT

10

LOAD CURRENT (A)

100

1m

100m

SYNC = REF (300kHz)

ON3 = ON5 = HIGH

1

____________________________Typical Operating Characteristics (continued)

SHUTDOWN SUPPLY CURRENT vs.

SUPPLY VOLTAGE

0

100

200

300

400

500

0

612

18

24

30

SUPPLY VOLTAGE (V)

SHDN = 0V

PULSE-WIDTH MODULATION MODE WAVEFORMS

LX VOLTAGE

10V/div

+5V OUTPUT

VOLTAGE

50mV/div

500ns/div

IDLE-MODE WAVEFORMS

+5V OUTPUT

50mV/div

2V/div

200

µs/div