MAX640C/D Ver la hoja de datos (PDF) - Maxim Integrated
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MAX640C/D Datasheet PDF : 13 Pages
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5V/3.3V/3V/Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Converters
_____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 3, internal feedback, L = 100µH, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs.
OUTPUT CURRENT
100
L = 100µH
90
EFFICIENCY vs.
EFFICIENCY vs.
INPUT VOLTAGE
INPUT VOLTAGE
100
100
IOUT = 100mA
L = 470µH
IOUT = 25mA
95
MAX639
95
MAX639
80
MAX639, V+ = 6V
MAX640, V+ = 4.3V
MAX653, V+ = 4V
70
60
50
10µ 100µ 1m 10m 100m 1
OUTPUT CURRENT (A)
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
250
L = 100µH
MAX640
200
MAX653
150
MAX639
100
3 4 5 6 7 8 9 10 11 12
V+ (V)
90
MAX640
85
MAX653
80
3 4 5 6 7 8 9 10 11 12
V+ (V)
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE
75
L = 470µH
65
55
MAX640
MAX639
45
35
MAX653
25
3 4 5 6 7 8 9 10 11 12
V+ (V)
90
MAX640
85
MAX653
80
3
150
125
100
4 5 6 7 8 9 10 11 12
V+ (V)
MAX639
OUTPUT VOLTAGE RIPPLE vs.
INPUT VOLTAGE
IOUT = 25mA
L = 100µH
75
50
L = 220µH
25
L = 470µH
0
5 6 7 8 9 10 11 12
INPUT VOLTAGE (V)
MAX640
OUTPUT VOLTAGE RIPPLE vs.
INPUT VOLTAGE
150
IOUT = 25mA
125
L = 100µH
100
MAX653
OUTPUT VOLTAGE RIPPLE vs.
INPUT VOLTAGE
150
ILOAD = 25mA
125
100
L = 100µH
75
75
50
L = 220µH
L = 470µH
50
L = 220µH
25
25
0
3 4 5 6 7 8 9 10 11 12
V+ (V)
L = 470µH
0
3 4 5 6 7 8 9 10 11 12
V+ (V)
4 _______________________________________________________________________________________
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