Rainbow-electronics MAX8805Z Manual de usuario descargar pdf (Pagina 10)

MAX8805Y/MAX8805Z

600mA PWM Step-Down Converters in

2mm x 2mm WLP for WCDMA PA Power

10 ______________________________________________________________________________________

20μs/div

LDO1, LDO2 LOAD TRANSIENT

RESPONSE NEAR DROPOUT

100mA/div

50mV/div

100mA/div

MAX8805Y/Z toc38

0mA

80mA

IN2

= V

LDO1,2

+ 200mV

50mV/div

LDO1

LDO2

0mA

80mA

1ms/div

LDO1, LDO2 TURN ON AND

SHUTDOWN RESPONSE

2V/div

MAX8805Y/Z toc39

EN1,2

LDO1

LDO2

20μs/div

LDO LINE TRANSIENT RESPONSE

500mV/div

MAX8805Y/Z toc37

4.0V

3.5V

LDO_

= 80mA

5mV/div

IN2

LDO_

LDO PSRR vs. FREQUENCY

MAX8805Y/Z toc34

FREQUENCY (kHz)

PSRR (dB)

1001010.1

0.01 1000

LDO

= 30mA

LDO OUTPUT NOISE SPECTRAL DENSITY

vs. FREQUENCY

MAX8805Y/Z toc35

FREQUENCY (kHz)

OUTPUT NOISE DENSITY NOISE (nV/√Hz)

1001010.1

1.0E+02

1.0E+03

1.0E+04

1.0E+01

0.01 1000

400μs/div

LDO1, LDO2 OUTPUT NOISE WAVEFORM

50mV/div

MAX8805Y/Z toc36

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.)

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 20 21

MAX8805Y/MAX8805Z 1

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Rainbow-electronics MAX8805Z Manual de usuario Pagina 10

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