Rainbow-electronics MAX8884Z Manual de usuario Pagina 7

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MAX8884Y/MAX8884Z
700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
_______________________________________________________________________________________
7_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(V
IN
= V
IN1A
= V
IN1B
= V
IN2
= 3.6V, V
BUCK
= 1.2V, V
LDO1
= 1.8V, V
LDO2
= 2.8V, MAX8884YEVKIT, T
A
= +25°C, unless otherwise noted.)
LDO1, LDO2 LOAD TRANSIENT RESPONSE
MAX8884Y/Z toc24
20μs/div
I
LDO1
V
LDO2
I
LDO2
V
LDO1
AC-COUPLED
10mV/div
AC-COUPLED
10mV/div
50mA/div
50mA/div
1mA 1mA
1mA 1mA
40mA
40mA
LDO1, LDO2 LINE TRANSIENT
MAX8884Y/Z toc23
10μs/div
V
LDO1
V
IN
V
LDO2
AC-COUPLED
5mV/div
AC-COUPLED
5mV/div
1V/div
I
LDO1
= I
LDO2
= 100mA
4V 4V
3.5V
LDO OUTPUT-NOISE SPECTRAL DENSITY
vs. FREQUENCY, V
LDO_
= 2.8V
MAX884Y/Z toc22
FREQUENCY (kHz)
1001010.1
100
1000
10,000
10
0.01 1000
I
LDO_
= 30mA
NOISE DENSITY (nV(Hz))
LDO OUTPUT-NOISE SPECTRAL DENSITY
vs. FREQUENCY, V
LDO_
= 1.8V
MAX884Y/Z toc21
FREQUENCY (kHz)
NOISE DENSITY (nV(Hz))
1001010.1
100
1000
10,000
10
0.01 1000
I
LDO_
= 30mA
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