Rainbow Electronics MAX1797 - Manual (Page 5)

MAX1795/MAX1796/MAX1797
Low Supply Current, Step-Up DC-DC Converters
with True-Shutdown
_______________________________________________________________________________________ 5
100
0
0.1 1 10 100 1000
MAX1795
EFFICIENCY vs. LOAD CURRENT (+5V)
20
MAX1795/96/97 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V BATT = +2.4V
V BATT = +1.2V
V BATT = +3.6V
100
0
0.1 1 10 100 1000
MAX1795
EFFICIENCY vs. LOAD CURRENT (+3.3V)
20
MAX1795/96/97 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V BATT = +1.2V
L = 10 µH
V BATT = +2.4V
100
0
0.1 1 10 100 1000
MAX1796
EFFICIENCY vs. LOAD CURRENT (+5V)
20
MAX1795/96/97 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V
BATT
= +1.2V
V
BATT
= +2.4V
V BATT = +3.6V
100
0
0.1 1 10 100 1000
MAX1796
EFFICIENCY vs. LOAD CURRENT (+3.3V)
20
MAX1795/96/97 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V BATT = +1.2V
V BATT = +2.4V
100
0
0.1 1 10 100 1000
MAX1797
EFFICIENCY vs. LOAD CURRENT (+5V)
20
MAX1795/96/97 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V BATT = +3.6V
V BATT = +2.4V
V BATT = +1.2V
100
0
0.1 1 10 100 1000
MAX1797
EFFICIENCY vs. LOAD CURRENT (+3.3V)
20
MAX1795/96/97 toc06
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V BATT = +2.4V
V BATT = +1.2V
0
100
50
200
150
250
300
0 1.0 1.5 2.0 0.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5
NO-LOAD BATTERY CURRENT
vs. INPUT BATT VOLTAGE
BATT VOLTAGE (V)
BATTERY CURRENT (
µ
A)
MAX1795/96/97 toc07
V OUT = +3.3V
V OUT = +5V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0.1 10 100 1 1000
STARTUP VOLTAGE
vs. LOAD CURRENT
MAX1795/96/97 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)
V OUT = +3.3V
0
1.0
0.5
2.0
1.5
2.5
3.0
0 1.0 1.5 2.0 0.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SHUTDOWN THRESHOLD
vs. INPUT BATT VOLTAGE
BATT VOLTAGE (V)
SHUTDOWN THRESHOLD (V)
MAX1795/96/97 toc09
Typical Operating Characteristics
(L = 22µH, C IN = 47µF, C OUT = 47µF, T A = +25 °C, unless otherwise noted.)