AIC1633
ꢀ APPLICATION EXAMPLES (CONTINUED)
+VOUT
(+3V)
85
470Ω
+VIN
R1
VIN=1.6V
VIN=1.4V
80
75
VOUT
LBI
ILIM/SD
VIN
+
LOAD
VIN=1.0V
10µF
1N5819
D1
L1
100µH
VIN=1.2V
C1
VIN=0.8V
70
65
60
LBO
SW
CGND
SGND
+
AIC1633-3
22µF
5
0
10
15
20
25
30
35
C2
Load Current (mA)
Start-Up VIN Voltage = 1.4V
Fig. 3
1-Cell Input 3V Output Step-Up Converter
2SB1424
90
85
Q1
+VOUT
(+5V)
15K
R5
+VIN
VIN=5V
10K
RILIM
470Ω
VIN=6V
R1
VIN=4.5V
VIN=4V
R2
3.3K
R3
VIN=3V
VOUT
ILIM/SD
VIN=3.5V
62K
+
80
75
150µH
L1
+
C2
LBI
LBO
C4
VIN
10µF
10µF
SW
LOAD
20K
R4
CGND
SGND
+
VIN=7V
C1
1N5819
D1
70
22µF
AIC1633-5
20
40 60 80 100 120
160 180 200 220 240
Load Curren1t4(0mA)
0
Fig. 4
4-Cell Input Step-Up/ Step-Down Converter
+VIN
2SB1424
Q1
100
82µH
L1
+VOUT
1K
R1
1N5819
D1
(+3V)
95
VIN=3V
VIN=4V
1K
R2
R4
1K
R3
33K
VOUT
ILIM/SD
+
10µF
90
85
80
75
C2
+
LBI
VIN=5V
VIN
22µF
+
10µF
C3
LBO
C1
SW
LOAD
VIN=7V
24K
R5
CGND
SGND
VIN=6V
AIC1633-3
VOUT Ripple May Be Large at VIN=3V Condition
0
20
40
60
100 120 140 160 180 200 220
L8o0ad Current (mA)
Fig. 5 3-Cell Input 3V Output Step-Down Converter
8
AIC [ ANALOG INTERGRATIONS CORPORATION ]
