
M
3.3V /5V /Adjustable-Output,
S tep-Up DC-DC Converters
_________________________________________________________________________________________________
3
MINIMUM START-UP INPUT VOLTAGE
vs. LOAD CURRENT
M
LOAD CURRENT (mA)
S
10
100
1000
1
1.8
1.6
1.4
1.2
1.0
0.8
3.3V MODE
40
0.1
10
1000
EFFICIENCY vs. LOAD CURRENT
3.3V OUTPUT MODE
M
LOAD CURRENT (mA)
E
60
80
90
50
70
1
100
V
IN
= 2.0V
V
IN
= 1.2V
40
0.1
10
1000
EFFICIENCY vs. LOAD CURRENT
5V OUTPUT MODE
M
LOAD CURRENT (mA)
E
60
80
90
50
70
1
100
V
IN
= 3.3V
V
IN
= 2.5V
V
IN
= 1.25V
800
0
0
2
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
200
600
M
INPUT VOLTAGE (V)
M
4
400
100
300
500
700
1
3
5
3.3V MODE
5V MODE
1M
10
10
μ
10m
1
SWITCHING FREQUENCY
vs. LOAD CURRENT
100
M
LOAD CURRENT (A)
S
1k
10k
100k
100
μ
1m
100m
5V MODE
3.3V MODE
V
IN
= 2.5V
0
2
QUIESCENT CURRENT
vs. INPUT VOLTAGE
M
INPUT VOLTAGE (V)
Q
μ
A
4
100
200
300
400
500
1
3
5
V
OUT
= 3.3V
V
OUT
= 5V
CURRENT MEASURED AT V
IN
50
0
1
2
5
SHUTDOWN QUIESCENT CURRENT
vs. INPUT VOLTAGE
20
M
INPUT VOLTAGE (V)
S
μ
A
4
40
10
30
3
CURRENT MEASURED AT V
IN
10
0
0
REFERENCE VOLTAGE
LOAD REGULATION
2
8
M
LOAD CURRENT (
μ
A)
V
6
4
50
100
150
200
250
V
OUT
= 3.3V
__________________________________________Typic al Operating Charac teristic s
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)