Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
Typical Operating Characteristics
(L = 22µH, C = 47µF, C
= 47µF, T = +25°C, unless otherwise noted.)
IN
OUT
A
MAX1795
EFFICIENCY vs. LOAD CURRENT (+5V)
MAX1795
MAX1796
EFFICIENCY vs. LOAD CURRENT (+5V)
EFFICIENCY vs. LOAD CURRENT (+3.3V)
100
100
100
V
BATT
= +3.6V
V
= +3.6V
BATT
V
= +2.4V
BATT
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
V
= +2.4V
BATT
V
= +1.2V
V
= +1.2V
BATT
BATT
V
= +2.4V
BATT
V
= +1.2V
BATT
10
0
10
0
10
0
L = 10µH
1000
0.1
1
10
100
1000
0.1
1
10
100
0.1
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAX1797
EFFICIENCY vs. LOAD CURRENT (+5V)
MAX1796
MAX1797
EFFICIENCY vs. LOAD CURRENT (+3.3V)
EFFICIENCY vs. LOAD CURRENT (+3.3V)
100
100
100
V
= +2.4V
BATT
V
BATT
= +2.4V
V
= +3.6V
BATT
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
90
80
70
60
50
40
30
20
V
BATT
= +1.2V
V
V
= +2.4V
= +1.2V
BATT
BATT
V
= +1.2V
BATT
10
0
10
0
10
0
0.1
1
10
100
1000
0.1
1
10
100
1000
0.1
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
SHUTDOWN THRESHOLD
vs. INPUT BATT VOLTAGE
NO-LOAD BATTERY CURRENT
vs. INPUT BATT VOLTAGE
STARTUP VOLTAGE
vs. LOAD CURRENT
3.0
2.5
2.0
1.5
1.0
0.5
0
300
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
250
200
150
100
50
V
= +3.3V
OUT
V
= +5V
OUT
V
= +3.3V
OUT
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
BATT VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
BATT VOLTAGE (V)
0.1
1
10
100
1000
LOAD CURRENT (mA)
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
