Typical operating characteristics (continued) – Rainbow Electronics MAX8805Z User Manual
Page 6
MAX8805Y/MAX8805Z
600mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
6
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
IN1A
= V
IN1B
= V
IN2
= 3.6V, V
PA
= 1.2V, V
LDO1
= 2.85V, V
LDO2
= 2.85V, R
PA
= 7.5
Ω, circuit of Figure 5, T
A
= +25°C, unless other-
wise noted.)
50
60
80
70
90
100
0
200
100
300
500
400
600
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805Z)
MAX8805Y/Z toc10
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
V
PA
= 0.6V
50
60
80
70
90
100
0
200
100
300
500
400
600
PA STEP-DOWN CONVERTER EFFICIENCY
vs. LOAD CURRENT (MAX8805Y)
MAX8805Y/Z toc11
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN1
= 4.2V
V
IN1
= 3.6V
V
IN1
= 3.2V
V
PA
= 0.6V
1.25
1.20
1.15
1.10
1.05
0
300
100
200
400
500
600
PA STEP-DOWN CONVERTER OUTPUT
VOLTAGE vs. LOAD CURRENT
MAX8805Y/Z toc12
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
MAX8805Y
MAX8805Z
0.5
1.5
1.0
2.5
2.0
3.5
3.0
4.0
0
0.8
0.4
1.2
1.6
2.0
PA STEP-DOWN CONVERTER OUTPUT
VOLTAGE vs. REFIN VOLTAGE
MAX8805Y/Z toc13
REFIN VOLTAGE (V)
OUTPUT VOLTAGE (V)
-100
-60
-80
0
-20
-40
20
40
80
60
100
0.4
0.6 0.7
0.5
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
REFIN vs. REFIN TO OUT GAIN (MAX8805Z)
MAX8805Y/Z toc14
REFIN VOLTAGE (V)
OUTPUT VOLTAGE ERROR (mV)
V
IN1
= 3.2V, NO LOAD
V
IN1
= 4.2V, NO LOAD
-50
-30
-10
10
30
50
0.4
0.6 0.7
0.5
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
REFIN vs. REFIN TO OUT GAIN (MAX8805Y)
MAX8805Y/Z toc15
REFIN VOLTAGE (V)
OUTPUT VOLTAGE ERROR (mV)
V
IN1
= 3.2V, NO LOAD
V
IN1
= 4.2V, NO LOAD