MAX639_05 datasheet(4/13 Pages) MAXIM

Part #	MAX639

Description	5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Conver

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Manufacturer	MAXIM [Maxim Integrated Products]

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4 / 13 page

0

10

MAX640

OUTPUT VOLTAGE RIPPLE vs.

INPUT VOLTAGE

25

100

V+ (V)

7

75

150

3456

8

9

11

12

IOUT = 25mA

L = 100

µH

125

50

L = 220

µH

L = 470

µH

0

10

MAX653

OUTPUT VOLTAGE RIPPLE vs.

INPUT VOLTAGE

25

100

V+ (V)

7

75

150

3456

8

9

11

12

ILOAD = 25mA

125

50

L = 220

µH

L = 470

µH

L = 100

µH

5V/3.3V/3V/Adjustable, High-Efficiency,

Low IQ, Step-Down DC-DC Converters

4

_______________________________________________________________________________________

100

50

10

µ

100

µ

1

EFFICIENCY vs.

OUTPUT CURRENT

60

OUTPUT CURRENT (A)

70

80

90

1m

10m

100m

L = 100

µH

MAX639, V+ = 6V

MAX640, V+ = 4.3V

MAX653, V+ = 4V

100

10

MAXIMUM OUTPUT CURRENT vs.

INPUT VOLTAGE

200

V+ (V)

7

250

3456

8

9

11

12

150

MAX640

MAX653

MAX639

L = 100

µH

80

10

EFFICIENCY vs.

INPUT VOLTAGE

85

95

V+ (V)

7

90

100

3456

8

9

11

12

IOUT = 100mA

MAX639

MAX640

MAX653

80

10

EFFICIENCY vs.

INPUT VOLTAGE

85

95

V+ (V)

7

90

100

3456

8

9

11

12

L = 470

µH

IOUT = 25mA

MAX639

MAX640

MAX653

25

10

MAXIMUM OUTPUT CURRENT vs.

INPUT VOLTAGE

65

V+ (V)

7

75

3456

8

9

11

12

55

MAX640

MAX653

MAX639

45

35

L = 470µH

0

10

MAX639

OUTPUT VOLTAGE RIPPLE vs.

INPUT VOLTAGE

25

100

INPUT VOLTAGE (V)

7

75

150

5

6

8

9

11

12

L = 100

µH

125

50

L = 220

µH

L = 470

µH

IOUT = 25mA

_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 3, internal feedback, L = 100µH, TA = +25°C, unless otherwise noted.)

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