Rainbow-electronics MAX8805Z Manual do Utilizador descarregar pdf (Página 12)

MAX8805Y/MAX8805Z

600mA PWM Step-Down Converters in

2mm x 2mm WLP for WCDMA PA Power

12 ______________________________________________________________________________________

PWM LOGIC

STEP-DOWN CURRENT LIMIT

PWM ERROR

COMPARATOR

CURRENT-LIMIT CONTROL

PGND

PAA

BYPASS FET

REFIN

R2 R1

R5R4

IN2

ERROR AMP

LDO1 CURRENT LIMIT

LDO2 CURRENT LIMIT

BANDGAP

LDO1

R11

R10

LDO2

R12

1.25V

REFERENCE

CONTROL

LOGIC

REFBP

AGND

BANDGAP

EN1

EN2

PA_EN

PAB

IN1B

IN1A

Figure 1. Block Diagram

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 20 21

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Rainbow-electronics MAX8805Z Manual do Utilizador Página 12