Typical operating characteristics – Rainbow Electronics MAX723 User Manual
Page 3
MAX756/MAX757
3.3V/5V/Adjustable-Output,
Step-Up DC-DC Converters
_________________________________________________________________________________________________
3
MINIMUM START-UP INPUT VOLTAGE
vs. LOAD CURRENT
MAX756-7
LOAD CURRENT (mA)
START-UP INPUT VOLTAGE (V)
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
MAX756-1
LOAD CURRENT (mA)
EFFICIENCY (%)
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
MAX756-2
LOAD CURRENT (mA)
EFFICIENCY (%)
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
MAX756-3
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
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
MAX756-4
LOAD CURRENT (A)
SWITCHING FREQUENCY (Hz)
1k
10k
100k
100
µ
1m
100m
5V MODE
3.3V MODE
V
IN
= 2.5V
0
2
QUIESCENT CURRENT
vs. INPUT VOLTAGE
MAX756-5
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
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
MAX756-6
INPUT VOLTAGE (V)
SHUTDOWN QUIESCENT CURRENT (
µ
A)
4
40
10
30
3
CURRENT MEASURED AT V
IN
10
0
0
REFERENCE VOLTAGE
LOAD REGULATION
2
8
MAX756-8
LOAD CURRENT (
µ
A)
VREF LOAD REGULATION (mV)
6
4
50
100
150
200
250
V
OUT
= 3.3V
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)