MAX8792(2007) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX8792 Datasheet PDF : 29 Pages
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Single Quick-PWM Step-Down
Controller with Dynamic REFIN
Typical Operating Characteristics (continued)
(MAX8792 Circuit of Figure 1, VIN = 12V, VDD = 5V, SKIP = GND, RTON = 200kΩ, TA = +25°C, unless otherwise noted.)
100
90
80
70
60
50
40
30
20
0.01
1.05V OUTPUT EFFICIENCY
vs. LOAD CURRENT
7V
20V 12V
SKIP MODE
PWM MODE
0.1
1
10
LOAD CURRENT (A)
SWITCHING FREQUENCY
vs. LOAD CURRENT
350
300
PWM MODE
250
200
150
100
LOW-NOISE
50
MODE
SKIP MODE
0
0.01
0.1
1
10
LOAD CURRENT (A)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
13.6
13.5
13.4
13.3
13.2
13.1
13.0
12.9
6
9 12 15 18 21 24
INPUT VOLTAGE (V)
1.05V OUTPUT EFFICIENCY
vs. LOAD CURRENT
100
SKIP MODE
90
80
70
60
PWM MODE
50
40 LOW-NOISE
MODE
30
20
0.01
0.1
1
10
LOAD CURRENT (A)
PWM MODE SWITCHING FREQUENCY
vs. INPUT VOLTAGE
330
320
ILOAD = 5A
310
300
290
280
270
NO LOAD
260
250
240
6
10
14
18
22
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. TEMPERATURE
20
19
WITHOUT TEMPERATURE
18
COMPENSATION
R4 = R5 = 49.9kΩ
17
16
15
WITH
14
TEMPERATURE
COMPENSATION
13
(FIGURE 1)
12
11
10
-40 -20
0 20 40 60
LOAD CURRENT (A)
80 100
1.05V OUTPUT VOLTAGE
vs. LOAD CURRENT
1.07
1.06
LOW-NOISE
MODE
1.05
SKIP MODE
1.04
PWM MODE
1.03
0
2
4
6
8
10
LOAD CURRENT (A)
SWITCHING FREQUENCY
vs. TEMPERATURE
300
ILOAD = 10A
290
280
ILOAD = 5A
270
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
NO-LOAD SUPPLY CURRENT IBIAS
vs. INPUT VOLTAGE
16
14
PWM MODE
12
10
8
6
4
LOW-NOISE MODE
2
SKIP MODE
0
6
9 12 15 18 21 24
INPUT VOLTAGE (V)
_______________________________________________________________________________________ 7
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