MAX8805Y/MAX8805Z
600mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
_______________________________________________________________________________________
5
Typical Operating Characteristics
(V
IN1A
= V
IN1B
= V
IN2
= 3.6V, V
PA
= 1.2V, V
LDO1
= 2.85V, V
LDO2
= 2.85V, R
PA
= 7.5Ω, circuit of Figure 5, T
A
= +25°C, unless other-
wise noted.)
0
40
20
80
60
120
100
140
0 0.4 0.60.2 0.8 1.0 1.2 1.4 1.6 1.8
BYPASS MODE DROPOUT VOLTAGE
vs. PA LOAD CURRENT
MAX8805Y/Z toc01
PA LOAD CURRENT (A)
BYPASS MODE DROPOUT VOLTAGE (mV)
V
IN1
= 3.2V
V
IN1
= 3.6V
60
70
80
90
100
0.5 1.5 2.5 3.51.0 2.0 3.0 4.0 4.5
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805Z)
MAX8805Y/Z toc02
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
R
PA
= 7.5Ω
60
70
80
90
100
0.5 1.5 2.5 3.51.0 2.0 3.0 4.0 4.5
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805Y)
MAX8805Y/Z toc03
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
R
PA
= 7.5Ω
60
70
80
90
100
0.5 1.5 2.5 3.51.0 2.0 3.0 4.0 4.5
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805Z)
MAX8805Y/Z toc04
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
R
PA
= 10Ω
60
70
80
90
100
0.5 1.5 2.5 3.51.0 2.0 3.0 4.0 4.5
PA STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT VOLTAGE (MAX8805Y)
MAX8805Y/Z toc05
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
BYPASS MODE
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
R
PA
= 10Ω
50
60
80
70
90
100
0200100 300 400 500 600
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805Z)
MAX8805Y/Z toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
V
PA
= 1.8V
50
60
80
70
90
100
0 200100 300 500400 600
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805Y)
MAX8805Y/Z toc07
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
V
PA
= 1.8V
50
60
80
70
90
100
0200100 300 500400 600
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805Z)
MAX8805Y/Z toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
V
PA
= 1.2V
50
60
80
70
90
100
0200100 300 500400 600
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805Y)
MAX8805Y/Z toc09
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
V
PA
= 1.2V
(16 paginas)
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