700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
6 _______________________________________________________________________________________
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癈, unless otherwise noted.)
LDO POWER SUPPLY
RIPPLE REJECTION, V
OUT
= 1.8V
FREQUENCY (kHz)
100
10
0.1 1
10
20
30
40
50
60
70
80
0
0.01
1000
I
LDO
= 30mA
LDO OUTPUT VOLTAGE
NOISE WAVEFORM, V
OUT_
= 1.8V
MAX8884Y/Z toc20
400 s/div
MAX8884Y/MAX8884Z
LDO1 = 1.8 AT 30mA
V
IN
= 3.6V
50礦/div
V
N
= 26.1礦
RMS
,
f = 100Hz to 100kHz, I
LDO_
= 30mA
LDO2 DROPOUT VOLTAGE
vs. LOAD CURRENT
LOAD CURRENT (mA)
250
200
150
100
50
50
100
150
200
250
0
0
300
LDO POWER SUPPLY
RIPPLE REJECTION, V
OUT
= 2.8V
FREQUENCY (kHz)
100
10
1
0.1
10
20
30
40
50
60
70
0
0.01
1000
I
LDO_
= 30mA
LDO1, LDO2 INPUT SUPPLY CURRENT
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
5
4
3
2
1
50
100
150
200
250
300
350
0
0
6
V
LDO1_EN
= V
LDO2_EN
= V
IN
,
V
BUCK_EN
= 0
MAX8884Y STEP-DOWN CONVERTER
SHUTDOWN WAVEFORMS
MAX8884Y/Z toc15
10祍/div
I
LX
V
OUT
V
BUCK_EN
0V
1V/div
0V
5V/div
500mA/div
0A
I
LOAD
= 500mA
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