Rainbow Electronics MAX8805Z - Manual (Page 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
LX
PGND
PAA
BYPASS FET
HP
REFIN
R2 R1
R3
R5 R4
R6
R7
C2
C1
IN2
R8
R7
ERROR AMP
ERROR AMP
LDO1 CURRENT LIMIT
LDO2 CURRENT LIMIT
BANDGAP
BANDGAP
LDO1
R11
R10
LDO2
R9
R12
1.25V
REFERENCE
CONTROL
LOGIC
REFBP
AGND
BANDGAP
EN1
EN2
PA_EN
PAB
IN1B
IN1A
Figure 1. Block Diagram