Low-Cost, Dual-Output, Step-Down

Controller with Fast Transient Response

4

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EFFICIENCY vs. LOAD CURRENT

(600kHz, FIGURE 2)

LOAD CURRENT (A)

1

10

20

30

40

50

60

70

80

90

100

0

0.1

10

NO LOAD ON THE

OTHER REGULATOR

EFFICIENCY vs. LOAD CURRENT

(1MHz, FIGURE 4)

LOAD CURRENT (A)

1

10

20

30

40

50

60

70

80

90

100

0

0.1

10

NO LOAD ON OUT2

LOAD REGULATION

(600kHz, FIGURE 2)

OUT1 LOAD CURRENT (A)

24

68

2.46

2.47

2.48

2.49

2.50

2.51

2.52

2.53

2.54

2.55

2.45

010

POWER-UP WAVEFORMS

MAX8664 toc08

5V/div

2V/div

2V/div

10V/div

1ms/div

LINE REGULATION

(600kHz, FIGURE 2)

INPUT VOLTAGE (V)

810

12

14

18

16

2.46

2.47

2.48

2.49

2.50

2.51

2.52

2.53

2.54

2.55

2.45

620

8A LOAD

NO LOAD

400

700

50

100

150

200

250

0

100

1000

SWITCHING FREQUENCY (kHz)

OUT1 LOAD TRANSIENT (FIGURE 2)

MAX8664 toc06

2A/div

100mV/div

20

μs/div

2.5A

2.5A

5A

LOAD TRANSIENT

-3A TO +3A TO -3A (FIGURE 3)

MAX8664 toc07

5A/div

50mV/div

50mV/div

100

μs/div

-3A

-3A

+3A

Typical Operating Characteristics