Rainbow-electronics MAX8805Z Manual do Utilizador descarregar pdf (Página 6)

MAX8805Y/MAX8805Z

600mA PWM Step-Down Converters in

2mm x 2mm WLP for WCDMA PA Power

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

IN1A

= V

IN1B

= V

IN2

= 3.6V, V

= 1.2V, V

LDO1

= 2.85V, V

LDO2

= 2.85V, R

= 7.5Ω, circuit of Figure 5, T

= +25°C, unless other-

wise noted.)

100

0 200100 300 500400 600

PA STEP-DOWN CONVERTER EFFICIENCY

vs. LOAD CURRENT (MAX8805Z)

MAX8805Y/Z toc10

LOAD CURRENT (mA)

EFFICIENCY (%)

IN1

= 4.2V

IN1

= 3.6V

IN1

= 3.2V

= 0.6V

100

0 200100 300 500400 600

PA STEP-DOWN CONVERTER EFFICIENCY

vs. LOAD CURRENT (MAX8805Y)

MAX8805Y/Z toc11

LOAD CURRENT (mA)

EFFICIENCY (%)

IN1

= 4.2V

IN1

= 3.6V

IN1

= 3.2V

= 0.6V

1.25

1.20

1.15

1.10

1.05

0 300100 200 400 500 600

PA STEP-DOWN CONVERTER OUTPUT

VOLTAGE vs. LOAD CURRENT

MAX8805Y/Z toc12

LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

MAX8805Y

MAX8805Z

0.5

1.5

1.0

2.5

2.0

3.5

3.0

4.0

00.80.4 1.2 1.6 2.0

PA STEP-DOWN CONVERTER OUTPUT

VOLTAGE vs. REFIN VOLTAGE

MAX8805Y/Z toc13

REFIN VOLTAGE (V)

OUTPUT VOLTAGE (V)

-100

-60

-80

-20

-40

100

0.4 0.6 0.70.5 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5

REFIN vs. REFIN TO OUT GAIN (MAX8805Z)

MAX8805Y/Z toc14

REFIN VOLTAGE (V)

OUTPUT VOLTAGE ERROR (mV)

IN1

= 3.2V, NO LOAD

IN1

= 4.2V, NO LOAD

-50

-30

-10

0.4 0.6 0.70.5 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5

REFIN vs. REFIN TO OUT GAIN (MAX8805Y)

MAX8805Y/Z toc15

REFIN VOLTAGE (V)

OUTPUT VOLTAGE ERROR (mV)

IN1

= 3.2V, NO LOAD

IN1

= 4.2V, NO LOAD

1 2 3 4 5 6 7 8 9 10 11 ... 20 21

MAX8805Y/MAX8805Z 1

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