Typical operating characteristics – Rainbow Electronics MAX1708 User Manual
Page 5
MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
_______________________________________________________________________________________
5
Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
100
0
0.1
1
1000
10,000
EFFICIENCY vs. OUTPUT CURRENT
MAX1708 toc01a
OUTPUT CURRENT (mA)
EFFICIENCY (%)
10
100
20
40
60
80
V
IN
= 3.3V
V
IN
= 2.5V
V
OUT
= 5V
2.0
-2.0
0.1
1
1000
10,000
LOAD REGULATION
(V
IN
= 3.3V, V
OUT
= 5V)
-1.5
0.5
1.0
1.5
MAX1708 toc03a
OUTPUT CURRENT (mA)
V
OUT
REGULATION (%)
10
100
-1.0
-0.5
0
PLOT NORMALIZED TO I
OUT
= 500mA
2.0
-2.0
0.1
1
1000
10,000
LOAD REGULATION
(V
IN
= 2.5V, V
OUT
= 3.3V)
-1.5
0.5
1.0
1.5
MAX1708 toc03b
OUTPUT CURRENT (mA)
V
OUT
REGULATION (%)
10
100
-1.0
-0.5
0
PLOT NORMALIZED TO I
OUT
= 500mA
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
1.50
1.75
2.00
2.25
2.50
2.75
3.00
LINE REGULATION
(V
OUT
= 3.3V)
MAX1708 toc04b
INPUT VOLTAGE (V)
V
OUT
REGULATION (%)
PLOT NORMALIZED TO V
IN
= 2.5V
I
OUT
= 500mA
I
OUT
= 1A
0
5
15
10
20
25
0
2
1
3
4
5
6
NO LOAD INPUT CURRENT
vs. INPUT VOLTAGE
MAX1708 toc05a
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
V
OUT
= 5V, V
IN
INCREASING
V
OUT
= 3.3V, V
IN
INCREASING
0
20
10
40
30
60
50
70
0
2
3
1
4
5
6
NO LOAD INPUT CURRENT
vs. INPUT VOLTAGE
MAX1708 toc05b
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
V
OUT
= 3.3V, V
IN
DECREASING
V
OUT
= 5V, V
IN
DECREASING
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
2.00
2.50
2.25
2.75 3.00 3.25 3.50 3.75 4.00
LINE REGULATION
(V
OUT
= 5V)
MAX1708 toc04a
INPUT VOLTAGE (V)
V
OUT
REGULATION (%)
PLOT NORMALIZED TO V
IN
= 3.3V
I
OUT
= 500mA
I
OUT
= 1A
100
0
0.1
1
1000
10,000
EFFICIENCY vs. OUTPUT CURRENT
MAX1708 toc01b
OUTPUT CURRENT (mA)
EFFICIENCY (%)
10
100
20
40
60
80
V
IN
= 1.2V
V
IN
= 2.5V
V
OUT
= 3.3V
86
87
88
89
90
EFFICIENCY vs. SWITCHING FREQUENCY
MAX1708 toc02
SWITCHING FREQUENCY (kHz)
EFFICIENCY (%)
350
650
750
450
550
850
950
V
IN
= 3.3V, V
OUT
= 5V, I
OUT
=1A