Rainbow-electronics MAX8625A Manual de usuario descargar pdf (Pagina 4)

Typical Operating Characteristics

(V

IN

= 3.6V, SKIP = GND, T

A

= +25°C, Figure 4, unless otherwise noted.)

MAX8625A

High-Efficiency, Seamless Transition,

Step-Up/Down DC-DC Converter

4 _______________________________________________________________________________________

EFFICIENCY vs. LOAD CURRENT

SKIP AND FPWM MODES

MAX8625A toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

100101

10

20

30

40

50

60

70

80

90

100

0

0.1 1000

V

OUT

= 3.3V

V

IN

= 2.7V

3.0V,

3.3V,

3.6V,

4.2V,

5.0V

60

70

65

80

75

85

90

95

100

2.0 3.0 3.52.5 4.0 4.5 5.0 5.5 6.0

SKIP-MODE EFFICIENCY

vs. INPUT VOLTAGE

MAX8625A toc02

INPUT VOLTAGE (V)

EFFICIENCY (%)

100mA

300mA

500mA

V

OUT

= 3.3V

LOAD CURRENT = 100mA,

300mA, 500mA

EFFICIENCY vs. LOAD CURRENT

FPWM MODE (FIGURE 3)

MAX8625A toc03

LOAD CURRENT (mA)

EFFICIENCY (%)

100101

10

20

30

40

50

60

70

80

90

100

0

0.1 1000

V

OUT

= 2.8V

V

IN

= 2.7V

3.0V,

3.3V,

3.6V,

4.2V,

5.0V

EFFICIENCY vs. LOAD CURRENT

FPWM MODE (FIGURE 3)

MAX8625A toc04

LOAD CURRENT (mA)

EFFICIENCY (%)

100101

10

20

30

40

50

60

70

80

90

100

0

0.1 1000

V

OUT

= 3.45V

V

IN

= 2.7V

3.0V,

3.3V,

3.6V,

4.2V,

5.0V

OUTPUT VOLTAGE (3.3V INTERNAL FB)

vs. LOAD CURRENT

MAX8625A toc05

LOAD CURRENT (mA)

DEVIATION (%)

100101

-1.5

-1.0

-0.5

0

0.5

1.0

1.5

2.0

-2.0

0.1 1000

V

OUT

= 3.3V

T

A

= +25°C, T

A

= -40°C, T

A

= +85°C,

OUTPUT VOLTAGE (2.8V EXTERNAL FB)

vs. LOAD CURRENT (FIGURE 3)

MAX8625A toc06

LOAD CURRENT (mA)

DEVIATION (%)

100101

-1.5

-1.0

-0.5

0

0.5

1.0

1.5

2.0

-2.0

0.1 1000

V

OUT

= 2.8V

T

A

= +25°C, T

A

= -40°C, T

A

= +85°C

3.27

3.29

3.28

3.31

3.30

3.32

3.33

3.0 4.0 4.53.5 5.0 5.5 6.0

OUTPUT VOLTAGE vs. INPUT VOLTAGE

WITH INTERNAL FB RESISTORS

MAX8625A toc07

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

LOAD: 500mA, V

OUT

= 3.3V

T

A

= +25°C, T

A

= -40°C, T

A

= +85°C

2.75

2.77

2.76

2.79

2.78

2.81

2.80

2.82

3.0 4.0 4.53.5 5.0 5.5 6.0

OUTPUT VOLTAGE vs. INPUT VOLTAGE

WITH EXTERNAL FB RESISTORS

MAX8625A toc08

INPUT VOLTAGE (V)

OUTPUT VOLTAGE (V)

LOAD: 500mA, V

OUT

= 2.8V

T

A

= +25°C, T

A

= -40°C, T

A

= +85°C (FIGURE 3)

SUPPLY CURRENT vs. INPUT VOLTAGE

WITH NO LOAD

MAX8625A toc09

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

5.55.04.54.03.53.02.5

0.1

1

10

100

0.01

2.0 6.0

NO LOAD V

OUT

= 3.3V

FPWM MODE

1 2 3 4 5 6 7 8 9 ... 13 14

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