Step-down dc-dc controllers, Typical operating characteristics – Rainbow Electronics MAX652 User Manual
Page 4
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
80
66
SUPPLY CURRENT vs. TEMPERATURE
68
78
I+ (mA)
76
74
-60
-20
60
140
MAX649-A01
TEMPERATURE (°C)
20
100
-40
0
80
40
120
72
70
V+ = 10V
V+ = 16.5V
V+ = 4V
4.0
0
SHUTDOWN CURRENT
vs. TEMPERATURE
0.5
3.5
I+ (mA)
3.0
2.5
-60
-20
60
140
MAX649-A02
TEMPERATURE (°C)
20
100
-40
0
80
40
120
2.0
1.5
V+ = 8V
V+ = 16.5V
V+ = 4V
1.0
2500
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 1415
MAX649 MAXIMUM LOAD CURRENT
vs. SUPPLY VOLTAGE
500
2000
MAX649-A03
INPUT VOLTAGE (V)
MAXIMUM LOAD CURRENT (mA)
1500
1000
V
OUT
= 5V
CIRCUIT OF FIGURE 1
100
90
0
100
µ
1m
10m
100m
1
MAX649
EFFICIENCY vs. LOAD CURRENT
20
MAX649-A04
LOAD CURRENT (A)
EFFICIENCY (%)
40
60
80
70
50
30
10
V
IN
= 6V
V
IN
= 8V
V
IN
= 10V
V
IN
= 12V
V
IN
= 15V
V
OUT
= 5V
TOP TO BOTTOM:
17
15
SWITCH ON-TIME
vs. TEMPERATURE
t
ON
(ms)
-60 -40 -20
60
MAX649-A07
TEMPERATURE (°C)
0
20
40
80 100 120
16
V+ = 5V
100
90
0
100
µ
1m
10m
100m
1
MAX651
EFFICIENCY vs. LOAD CURRENT
20
MAX649-A05
LOAD CURRENT (A)
EFFICIENCY (%)
40
60
80
70
50
30
10
V
IN
= 4.3V
V
IN
= 5V
V
IN
= 8V
V
IN
= 10V
V
IN
= 12V
V
IN
= 15V
V
OUT
= 3.3V
TOP TO BOTTOM:
100
90
0
100
µ
1m
10m
100m
1
MAX652
EFFICIENCY vs. LOAD CURRENT
20
MAX649-A06
LOAD CURRENT (A)
EFFICIENCY (%)
40
60
80
70
50
30
10
V
IN
= 4.3V
V
IN
= 5V
V
IN
= 8V
V
IN
= 10V
V
IN
= 12V
V
IN
= 15V
V
OUT
= 3V
TOP TO BOTTOM:
2.5
1.5
SWITCH OFF-TIME
vs. TEMPERATURE
t
OFF
(ms)
MAX649-A08
TEMPERATURE (°C)
2.0
V+ = 5V
-60 -40 -20
60
0
20
40
80 100 120
8.0
6.0
SWITCH ON-TIME/OFF-TIME RATIO
vs. TEMPERATURE
6.4
7.6
t
ON
/t
OFF
RATIO
7.2
6.8
6.2
6.6
7.8
7.4
7.0
V+ = 5V
-60
-20
60
140
MAX649-A9
TEMPERATURE (°C)
20
100
-40
0
80
40
120