Typical operating characteristics (continued) – Rainbow Electronics MAX8805Z User Manual
Page 10
MAX8805Y/MAX8805Z
600mA PWM Step-Down Converters in
2mm x 2mm WLP for WCDMA PA Power
10
______________________________________________________________________________________
20
μs/div
LDO1, LDO2 LOAD TRANSIENT
RESPONSE NEAR DROPOUT
100mA/div
50mV/div
100mA/div
MAX8805Y/Z toc38
0mA
80mA
V
IN2
= V
LDO1,2
+ 200mV
50mV/div
I
LDO1
V
LDO1
I
LDO2
V
LDO2
0mA
0mA
0mA
80mA
1ms/div
LDO1, LDO2 TURN ON AND
SHUTDOWN RESPONSE
2V/div
2V/div
2V/div
MAX8805Y/Z toc39
V
EN1,2
V
LDO1
V
LDO2
20
μs/div
LDO LINE TRANSIENT RESPONSE
500mV/div
MAX8805Y/Z toc37
4.0V
4.0V
3.5V
I
LDO_
= 80mA
5mV/div
V
IN2
V
LDO_
LDO PSRR vs. FREQUENCY
MAX8805Y/Z toc34
FREQUENCY (kHz)
PSRR (dB)
100
10
1
0.1
20
30
40
50
60
70
80
10
0.01
1000
I
LDO
= 30mA
LDO OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX8805Y/Z toc35
FREQUENCY (kHz)
OUTPUT NOISE DENSITY NOISE (nV/
√
Hz)
100
10
1
0.1
1.0E+02
1.0E+03
1.0E+04
1.0E+01
0.01
1000
400
μs/div
LDO1, LDO2 OUTPUT NOISE WAVEFORM
50mV/div
MAX8805Y/Z toc36
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.)