Typical operating characteristics – Rainbow Electronics MAX8625A User Manual
Page 4
Typical Operating Characteristics
(V
IN
= 3.6V, SKIP = GND, T
A
= +25°C, Figure 4, unless otherwise noted.)
MAX8625A
High-Efficiency, Seamless Transition,
Step-Up/Down DC-DC Converter
4
_______________________________________________________________________________________
EFFICIENCY vs. LOAD CURRENT
SKIP AND FPWM MODES
MAX8625A toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
1
10
20
30
40
50
60
70
80
90
100
0
0.1
1000
V
OUT
= 3.3V
V
IN
= 2.7V
3.0V,
3.3V,
3.6V,
4.2V,
5.0V
60
70
65
80
75
85
90
95
100
2.0
3.0
3.5
2.5
4.0
4.5
5.0
5.5
6.0
SKIP-MODE EFFICIENCY
vs. INPUT VOLTAGE
MAX8625A toc02
INPUT VOLTAGE (V)
EFFICIENCY (%)
100mA
300mA
500mA
V
OUT
= 3.3V
LOAD CURRENT = 100mA,
300mA, 500mA
EFFICIENCY vs. LOAD CURRENT
FPWM MODE (FIGURE 3)
MAX8625A toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
1
10
20
30
40
50
60
70
80
90
100
0
0.1
1000
V
OUT
= 2.8V
V
IN
= 2.7V
3.0V,
3.3V,
3.6V,
4.2V,
5.0V
EFFICIENCY vs. LOAD CURRENT
FPWM MODE (FIGURE 3)
MAX8625A toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
1
10
20
30
40
50
60
70
80
90
100
0
0.1
1000
V
OUT
= 3.45V
V
IN
= 2.7V
3.0V,
3.3V,
3.6V,
4.2V,
5.0V
OUTPUT VOLTAGE (3.3V INTERNAL FB)
vs. LOAD CURRENT
MAX8625A toc05
LOAD CURRENT (mA)
DEVIATION (%)
100
10
1
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
0.1
1000
V
OUT
= 3.3V
T
A
= +25
°C, T
A
= -40
°C, T
A
= +85
°C,
OUTPUT VOLTAGE (2.8V EXTERNAL FB)
vs. LOAD CURRENT (FIGURE 3)
MAX8625A toc06
LOAD CURRENT (mA)
DEVIATION (%)
100
10
1
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
0.1
1000
V
OUT
= 2.8V
T
A
= +25
°C, T
A
= -40
°C, T
A
= +85
°C
3.27
3.29
3.28
3.31
3.30
3.32
3.33
3.0
4.0
4.5
3.5
5.0
5.5
6.0
OUTPUT VOLTAGE vs. INPUT VOLTAGE
WITH INTERNAL FB RESISTORS
MAX8625A toc07
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
LOAD: 500mA, V
OUT
= 3.3V
T
A
= +25
°C, T
A
= -40
°C, T
A
= +85
°C
2.75
2.77
2.76
2.79
2.78
2.81
2.80
2.82
3.0
4.0
4.5
3.5
5.0
5.5
6.0
OUTPUT VOLTAGE vs. INPUT VOLTAGE
WITH EXTERNAL FB RESISTORS
MAX8625A toc08
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
LOAD: 500mA, V
OUT
= 2.8V
T
A
= +25
°C, T
A
= -40
°C, T
A
= +85
°C (FIGURE 3)
SUPPLY CURRENT vs. INPUT VOLTAGE
WITH NO LOAD
MAX8625A toc09
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
5.5
5.0
4.5
4.0
3.5
3.0
2.5
0.1
1
10
100
0.01
2.0
6.0
NO LOAD V
OUT
= 3.3V
FPWM MODE