Step-down dc-dc converters, Typical operating characteristics (continued) – Rainbow Electronics MAX653 User Manual
Page 4
0
10
MAX640
OUTPUT VOLTAGE RIPPLE vs.
INPUT VOLTAGE
25
100
MAX639-10
V+ (V)
OUTPUT VOLTAGE RIPPLE (mV)
7
75
150
3
4
5
6
8
9
11
12
I
OUT
= 25mA
L = 100
µ
H
125
50
L = 220
µ
H
L = 470
µ
H
0
10
MAX653
OUTPUT VOLTAGE RIPPLE vs.
INPUT VOLTAGE
25
100
MAX639-11
V+ (V)
OUTPUT VOLTAGE RIPPLE (mV)
7
75
150
3
4
5
6
8
9
11
12
I
LOAD
= 25mA
125
50
L = 220
µ
H
L = 470
µ
H
L = 100
µ
H
MAX639/MAX640/MAX653
5V/3.3V/3V/Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Converters
4
_______________________________________________________________________________________
100
50
10
µ
100
µ
1
EFFICIENCY vs.
OUTPUT CURRENT
60
MAX639-4
OUTPUT CURRENT (A)
EFFICIENCY (%)
70
80
90
1m
10m
100m
L = 100
µ
H
MAX639, V+ = 6V
MAX640, V+ = 4.3V
MAX653, V+ = 4V
100
10
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
200
MAX639-07
V+ (V)
MAXIMUM OUTPUT CURRENT (mA)
7
250
3
4
5
6
8
9
11
12
150
MAX640
MAX653
MAX639
L = 100
µ
H
80
10
EFFICIENCY vs.
INPUT VOLTAGE
85
95
MAX639-05
V+ (V)
EFFICIENCY (%)
7
90
100
3
4
5
6
8
9
11
12
I
OUT
= 100mA
MAX639
MAX640
MAX653
80
10
EFFICIENCY vs.
INPUT VOLTAGE
85
95
MAX639-06
V+ (V)
EFFICIENCY (%)
7
90
100
3
4
5
6
8
9
11
12
L = 470
µ
H
I
OUT
= 25mA
MAX639
MAX640
MAX653
25
10
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
65
MAX639-08
V+ (V)
MAXIMUM OUTPUT CURRENT (mA)
7
75
3
4
5
6
8
9
11
12
55
MAX640
MAX653
MAX639
45
35
L = 470µH
0
10
MAX639
OUTPUT VOLTAGE RIPPLE vs.
INPUT VOLTAGE
25
100
MAX639-09
INPUT VOLTAGE (V)
OUTPUT VOLTAGE RIPPLE (mV)
7
75
150
5
6
8
9
11
12
L = 100
µ
H
125
50
L = 220
µ
H
L = 470
µ
H
I
OUT
= 25mA
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 3, internal feedback, L = 100µH, T
A
= +25°C, unless otherwise noted.)