Typical operating characteristics – Rainbow Electronics MAX8715 User Manual
Page 5
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= 3.3V, f
OSC
= 640kHz, T
A
= +25°C, unless otherwise noted.)
MAX1790 toc01
50
1
1000
100
10
MAX1790 EFFICIENCY
vs. OUTPUT CURRENT
65
55
85
75
95
70
60
90
80
OUTPUT CURRENT (mA)
EFFICIENCY (%)
f
OSC
= 1.2MHz
L
= 2.7
µH
V
IN
= 3.3V
V
OUT
= 5V
f
OSC
= 640kHz
L
= 5.4
µH
50
1
1000
100
10
MAX1790 EFFICIENCY
vs. OUTPUT CURRENT
65
55
85
75
95
70
60
90
80
MAX1790 toc02
OUTPUT CURRENT (mA)
EFFICIENCY (%)
f
OSC
= 1.2MHz
L
= 5.4
µH
V
IN
= 3.3V
V
OUT
= 12V
f
OSC
= 640kHz
L
= 10
µH
OUTPUT CURRENT (mA)
50
1
1000
100
10
MAX1790 EFFICIENCY
vs. OUTPUT CURRENT
65
55
85
75
95
70
60
90
80
MAX1790 toc03
EFFICIENCY (%)
f
OSC
= 1.2MHz
L
= 5.4
µH
V
IN
= 5V
V
OUT
= 12V
f
OSC
= 640kHz
L
= 10
µH
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
2.5
3.5
4.0
3.0
4.5
5.0
5.5
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1790 toc04
INPUT VOLTAGE (V)
NO-LOAD SUPPLY CURRENT (mA)
V
OUT
= 12V
f
OSC
= 1.2MHz
f
OSC
= 640kHz
11.60
11.70
11.65
11.80
11.75
11.90
11.85
11.95
12.05
12.00
12.10
0
40 60 80
20
100 120 140
180
160
200
MAX1790 OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX1790 toc05
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
f
OSC
= 640kHz
T
A
= +85
°C
T
A
= +25
°C
T
A
= -40
°C
MAX8715 EFFICIENCY
vs. OUTPUT CURRENT
MAX1790 toc06
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
10
50
55
60
65
70
75
80
85
90
95
45
1
1000
V
IN
= 5.0V
V
IN
= 3.3V
V
OUT
= 9V
f
OSC
= 1.2MHz
L = 6.8
µH
MAX1790/MAX8715
Low-Noise Step-Up DC-DC Converters
_______________________________________________________________________________________
5