100

90

80

60

0

200

600

800

1000

OUTPUT CURRENT (mA)

MAX730A

EFFICIENCY vs. OUTPUT CURRENT

70

400

V+ = 5.5V

V+ = 7V

V+ = 9V

V+ = 11V

(NOTES 3, 6)

100

90

80

60

0

200

600

800

1000

OUTPUT CURRENT (mA)

MAX738A

EFFICIENCY vs. OUTPUT CURRENT

70

400

V+ = 6V

V+ = 8V

V+ = 12V

V+ = 16V

(NOTES 3, 6)

2.5

2.0

1.5

0

02

68

10

MAX738A/MAX744A

QUIESCENT SUPPLY CURRENT

vs. SUPPLY VOLTAGE

0.5

4

1.0

12

14

16

UNDERVOLTAGE

LOCKOUT HYSTERESIS

UNDERVOLTAGE

LOCKOUT ENABLED

1000

800

600

0

0

100

300 400 500

MAX738A/MAX744A

PEAK INDUCTOR CURRENT

vs. OUTPUT CURRENT

200

200

400

600 700 800

L1 = 100

µH

C4 = 150

µF

V+ = 6.6V

V+ = 8.0V TO 16.0V

5V, Step-Down,

Current-Mode PWM DC-DC Converters

4

_______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

100

90

80

60

0

200

600

800

1000

OUTPUT CURRENT (mA)

MAX744A

EFFICIENCY vs. OUTPUT CURRENT

70

400

V+ = 6.0V

V+ = 9.0V

V+ = 12.0V

V+ = 16.0V

(NOTE 3)

-60

0

60 80 100

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

16

10

6

2

18

14

12

8

4

0

-40 -20

20 40

120 140 160

V+ = 16V

MAX738A/MAX744A

ONLY

V+ = 9V

V+ = 6V

(NOTES 4, 5)

20

V+ = 12V

MAX738A/MAX744A

ONLY

3.0

2.5

1.5

1.0

0.5

-60

20 40

80

120

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

2.0

0

-40 -20 0

60

100

140 160

MAX730A, V+ = 9.0V

MAX738A, V+ = 12.0V

MAX744A, V+ = 12.0V

(NOTES 4, 5)

1400

1000

4

8

10

12

14

SUPPLY VOLTAGE (V)

MAXIMUM OUTPUT CURRENT vs.

SUPPLY VOLTAGE

1200

800

616

MAX738A

MAX730A

MAX744A

(NOTES 3, 6)

1400

1000

800

4

8

10

12

14

SUPPLY VOLTAGE (V)

MAXIMUM OUTPUT CURRENT vs.

SUPPLY VOLTAGE, NO R1

1200

616

600

400

200

(NOTES 3, 6)

MAX738A

MAX730A

MAX744A