Typical operating characteristics (continued) – Rainbow Electronics MAX8805Z User Manual
Page 9
MAX8805Y/MAX8805Z
600mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
_______________________________________________________________________________________
9
10
μs/div
PA STEP-DOWN CONVERTER AUTOMATIC
BYPASS-FET TRANSIENT RESPONSE
V
REFIN
V
PA
2V/div
1V/div
500mA/div
MAX8805Y/Z toc28
I
LX
1.8V
0.6V
0.6V
1.2V
1.2V
3.6V
200
μs/div
PA STEP-DOWN CONVERTER AUTOMATIC
BYPASS-FET TRANSIENT RESPONSE
V
REFIN
V
PA
1V/div
1V/div
500mA/div
MAX8805Y/Z toc29
I
LX
V
REFIN
IS A 0.4V TO
2V SINUSOIDAL
SIGNAL
3.6V
10
μs/div
PA STEP-DOWN CONVERTER
SHUTDOWN RESPONSE (MAX8805Y)
V
PA_EN
V
PA
1V/div
2V/div
100mA/div
MAX8805Y/Z toc30
I
LX
0V
2V
1.2V
10
μs/div
PA STEP-DOWN CONVERTER
SHUTDOWN RESPONSE (MAX8805Z)
V
PA_EN
V
PA
2V/div
2V/div
100mA/div
MAX8805Y/Z toc31
I
LX
0V
2V
1.2V
0
50
100
150
200
LDO1, LDO2 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8805Y/Z toc32
SUPPLY VOLTAGE (V)
NO-LOAD SUPPLY CURRENT (
μ
A)
2.0
3.5
4.0
2.5
3.0
4.5
5.0
5.5
0
30
90
60
120
150
LDO1, LDO2 DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8805Y/Z toc33
LOAD CURRENT (mA)
LDO1, LDO2 DROPOUT VOLTAGE (mV)
0
100
50
150
200
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.)