Rainbow-electronics MAX763A Manual do Utilizador Página 4

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MAX748A/MAX763A
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
4 _______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 3, T
A
= +25°C, V
OUT
= 3.3V, unless otherwise noted.)
MAX763A 
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
QUIESCENT SUPPLY CURRENT (mA)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 1 2 3 4 5 6 7 8 9 10 11 12
I
OUT
= 0mA
T
A
= +125°C
T
A
= -55°C
T
A
= +25°C
MAX748A
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
QUIESCENT SUPPLY CURRENT (mA)
5.0
4.0
3.0
2.0
1.0
0
SUPPLY VOLTAGE (V)
0 2 4 6 8 10 12 14 16
I
OUT
= OmA
T
A
= +125°C
T
A
= -55°C
T
A
= +25°C
PEAK INDUCTOR CURRENT
vs. OUTPUT CURRENT
PEAK INDUCTOR CURRENT (mA)
0
200
400
600
800
1000
0 50 100 150 200 250 300 350 400 450 500 550
OUTPUT CURRENT (mA)
V
IN
= 11V
V
IN
= 6V
V
IN
= 8V
OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
OSCILLATOR FREQUENCY (kHz)
100
125
150
250
175
200
225
275
0 2 4 6 810121416
SUPPLY VOLTAGE (V)
MAX748A
MAX763A
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
OUTPUT VOLTAGE (V)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
V
IN
= 4.0V
V
IN
= 3.0V
V
IN
= 3.5V
SHUTDOWN CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-60 -40 -20 0 20 40 60 80 100 120 140
I
OUT
= 0mA
V+ = 5V
NOTES 3, 4
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
OUTPUT VOLTAGE (V)
2.0 2.5 3.0 3.5 4.0 4.5 5.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
SUPPLY VOLTAGE (V)
I
LOAD
= 200mA
I
LOAD
= 50mA
I
LOAD
= 300mA
I
LOAD
= 500mA
OSCILLATOR FREQUENCY
vs. TEMPERATURE
OSCILATOR FREQUENCY (kHz)
0
50
100
150
200
250
300
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
MAX748A
MAX763A
I
OUT
= 100mA
V+ = 5V
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