700mA DC-DC Step-Down Converters
with Dual 300mA LDO in 2mm x 2mm CSP
8 _______________________________________________________________________________________
REFBP SOFT-START
C
REFBP
= 0.15礔
MAX8884Y/Z toc28
100祍/div
V
LDO1_EN
V
REFBP
V
LDO1
1V/div
0V
2V/div
0V
1V/div
0V
REFBP SOFT-START
C
REFBP
= 0.033礔
MAX8884Y/Z toc27
100 s/div
V
LDO1_EN
V
REFBP
V
LDO1
1V/div
0V
2V/div
0V
0V
1V/div
MAX8884Y SWITCHING FREQUENCY
vs. OUTPUT CURRENT (V
OUT
= 1.2V)
LOAD CURRENT (mA)
700
500
300
1.2
1.4
1.6
1.8
2.0
2.2
2.4
1.0
100
900
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 3V
C
IN
= C
OUT
= 2.2礔, L = 2.2礖
MAX8884Y SWITCHING FREQUENCY
vs. OUTPUT CURRENT (V
OUT
= 1.8V)
LOAD CURRENT (mA)
700
500
300
1.2
1.4
1.6
1.8
2.0
2.2
2.4
1.0
100
900
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 3V
C
IN
= C
OUT
= 2.2礔, L = 2.2礖
MAX8884Z SWITCHING FREQUENCY
vs. OUTPUT CURRENT (V
OUT
= 1.2V)o
LOAD CURRENT (mA)
700
500
300
3.0
4.0
4.5
3.5
5.0
2.5
100
900
C
IN
= C
OUT
= 2.2礔, L = 2.2礖
V
IN
= 3.6V
V
IN
= 3V
V
IN
= 4.2V
MAX8884Z SWITCHING FREQUENCY
vs. OUTPUT CURRENT (V
OUT
= 1.8V)
LOAD CURRENT (mA)
700
500
300
2.5
3.0
3.5
4.0
4.5
5.0
2.0
100
900
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 3V
C
IN
= C
OUT
= 2.2礔, L = 2.2礖
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.)
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