Rainbow Electronics MAX8805Z - Manual (Page 18)

MAX8805Y/MAX8805Z
600mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
18 ______________________________________________________________________________________
2.2 μF
2MHz OR 4MHz
BUCK
1 μH OR
2.2 μH*
LX
PBB
PGND
PBA
IN1A
IN1B
EN2
REFIN
2.2 μF
REF 0.22 μF
REFBP
AGND
LDO1
0.1 μF
0.1 μF
LDO2
IN2
1 μF
PA_EN
HP
EN1
CONTROL
EN/BIAS
IN
PA2
EN/BIAS
IN
PA1
GPIO
GPIO
GPIO
GPIO
DAC
BASEBAND
PROCESSOR
Li+ BATTERY
LDO1
LDO2
MAX8805Y/MAX8805Z
*1 μH FDK MIPS 2520D1R0
2.2 μH FDK MIPF 2520D2R2
Figure 4. Typical Application Circuit Using LDOs for PA Enable/Bias