Triple-Output Power-Supply Controller

for Notebook Computers

4

_______________________________________________________________________________________

Note 1: Output current is further limited by maximum allowable package power dissipation.

Note 2: Because the reference uses VL as its supply, the REF line regulation error is insignificant.

Note 3: The main switching outputs track the reference voltage. Loading the reference reduces the main outputs slightly according

50

1m

60

100

10

80

70

10m

1

90

100m

+5V OUTPUT CURRENT (A)

EFFICIENCY vs.

+5V OUTPUT CURRENT

V+ = 15V

N1-N4 = IRF7101

ON3 = LOW

F = 200kHz

V+ = 6V

50

1m

60

100

10

80

70

10m

1

90

100m

+3.3V OUTPUT CURRENT (A)

EFFICIENCY vs.

+3.3V OUTPUT CURRENT

V+ = 15V

N1-N4 = IRF7101

ON3 = ON5 = HIGH

F = 200kHz

V+ = 6V

500

0

05

20

MAXIMUM +15V VDD OUTPUT CURRENT vs.

SUPPLY VOLTAGE

100

200

SUPPLY VOLTAGE (V)

10

15

+3.3V REGULATING

+3.3V LOAD = 0A

+3.3V LOAD = 3A

300

400

QUIESCENT SUPPLY CURRENT vs.

SUPPLY VOLTAGE

0

1

2

13

14

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)

__________________________________________Typical Operating Characteristics

PARAMETER

CONDITIONS

UNITS

DL3/DL5 Sink/Source Current

1

A

DH3/DH5 Sink/Source Current

1

A

DL3/DL5 On-Resistance

High or low

7

Ω

DH3/DH5 On-Resistance

High or low, BST3-LX3 = BST5-LX5 = 4.5V

7

Ω

MIN

TYP

MAX

ELECTRICAL CHARACTERISTICS (continued)

—

H

—

D

—

N

–

= ON3 = ON5 = 5V, other digital input levels are 0V or +5V,