1.19

1.23

1.21

1.27

1.25

1.29

1.31

04

26

8

LOAD REGULATION

(CIRCUIT OF FIGURE 2)

LOAD CURRENT (A)

VTT CONNECTED AS

SHOWN IN FIGURE 2

VTT CONNECTED

TO THE OUTPUT

4.5V to 28V Input, Synchronous PWM Buck Controllers

for DDR Termination and Point-of-Load Applications

8

_______________________________________________________________________________________

Typical Operating Characteristics

°C, unless otherwise noted.)

100

30

0.1

1.0

10.0

EFFICIENCY vs. LOAD CURRENT

(CIRCUIT OF FIGURE 2)

60

LOAD CURRENT (A)

70

40

50

80

90

0.1

10.0

100.0

EFFICIENCY vs. LOAD CURRENT

(CIRCUIT OF FIGURE 1)

LOAD CURRENT (A)

1.0

100

30

40

50

60

70

90

80

400

450

550

500

600

650

-8

-4

-2

-6

0

246

8

SWITCHING FREQUENCY vs.

OUTPUT CURRENT (CIRCUIT OF FIGURE 2)

OUTPUT CURRENT (A)

200

240

220

280

260

300

320

6

8

10 12 14 16 18 20 22 24 26 28

SWITCHING FREQUENCY

vs. INPUT VOLTAGE (CIRCUIT OF FIGURE 3)

INPUT VOLTAGE (V)

160

180

170

200

190

210

220

-40

-15

10

35

60

85

FREQUENCY vs. TEMPERATURE

TEMPERATURE (°C)

0

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

4.5

5.0

4

8

12

16

20

24

28

MAX8554 SHUTDOWN SUPPLY CURRENT

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

V+ = HSD, EN = GND

0

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

4.5

5.0

4

8

12

16

20

24

28

MAX8553 SHUTDOWN SUPPLY CURRENT

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

EN = GND

1.74

1.78

1.76

1.82

1.80

1.84

1.86

0

4.0

8.0

12.0

16.0

20.0

LOAD REGULATION

(CIRCUIT OF FIGURE 1)

LOAD CURRENT (A)