Rainbow-electronics MAX1842 Manual do Utilizador descarregar pdf (Página 5)

Typical Operating Characteristics

(Circuit of Figure 1, T

= +25°C, unless otherwise noted.)

MAX1742/MAX1842

1A/2.7A, 1MHz, Step-Down Regulators with

Synchronous Rectification and Internal Switches

_______________________________________________________________________________________ 5

100

0.001 0.01 1

MAX1742

EFFICIENCY vs. OUTPUT CURRENT

= 5.0V, L = 6.0µH)

MAX1742 toc01

OUTPUT CURRENT (A)

EFFICIENCY (%)

0.1

OUT

= 1.8V, R

TOFF

= 75kΩ,

f = 833kHz

OUT

= 1.5V, R

TOFF

= 100kΩ, f = 692kHz

OUT

= 2.5V, R

TOFF

= 47kΩ, f = 926kHz

100

0.001 0.01 1

MAX1742

EFFICIENCY vs. OUTPUT CURRENT

= 3.3V, L = 3.9µH)

MAX1742 toc02

OUTPUT CURRENT (A)

EFFICIENCY (%)

0.1

OUT

= 2.5V, R

TOFF

= 36kΩ, f = 456kHz

OUT

= 1.8V, R

TOFF

= 43kΩ, f = 869kHz

OUT

= 1.5V, R

TOFF

= 56kΩ, f = 833kHz

100

0.001 0.01 1

MAX1742

EFFICIENCY vs.OUTPUT CURRENT

PWM

= 270kHz)

MAX1742 toc03

OUTPUT CURRENT (A)

EFFICIENCY (%)

0.1

= 5V, V

OUT

= 1.8V,

L = 15

µH, R

TOFF

= 240kΩ

= 3.3V, V

OUT

= 1.8V,

L = 10

µH, R

TOFF

= 160kΩ

0.5

0.4

0.3

0.2

0.1

-0.1

-0.2

-0.3

-0.4

-0.5

0.001 0.01 1

MAX1742

NORMALIZED OUTPUT ERROR

vs. OUTPUT CURRENT

MAX1742 toc04

OUTPUT CURRENT (A)

NORMALIZED OUTPUT ERROR (%)

0.1

= 5V, V

OUT

= 1.5V, L = 6µH

= 3.3V, V

OUT

= 1.5V

300

100

200

600

900

700

1100

1000

400

500

800

0 0.2 0.4 0.6 0.8 1.0

MAX1742

SWITCHING FREQUENCY

vs. OUTPUT CURRENT

MAX1742 toc05

OUTPUT CURRENT (A)

FREQUENCY (kHz)

= 5V, V

OUT

= 2.5V, L = 6µH

= 5V, V

OUT

= 1.5V, L = 6µH

= 3.3V, V

OUT

= 1.5V, L = 3.9µH

1 2 3 4 5 6 7 8 9 10 ... 15 16

MAX1742/MAX1842 1

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Rainbow-electronics MAX1842 Manual do Utilizador Página 5

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