MAX774(2002) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX774
(Rev.:2002)
(Rev.:2002)
Maxim Integrated
MAX774 Datasheet PDF : 16 Pages
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-5V/-12V/-15V or Adjustable, High-Efficiency,
Low IQ Inverting DC-to-DC Controllers
_____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
STARTUP VOLTAGE
vs. LOAD CURRENT (BOOTSTRAPPED)
5.0
VOUT = -15V
4.5
VOUT = -12V
4.0
3.5
VOUT = -5V
3.0
2.5
1
10
100 1000
LOAD CURRENT (mA)
EXT RISE AND FALL TIMES
vs. TEMPERATURE
130
CEXT = 1nF
120
110
100
5V RISE
90
80
5V FALL
70
60
12V RISE
50
40
30
12V FALL
20
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
STARTUP VOLTAGE
vs. LOAD CURRENT (NONBOOTSTRAPPED)
5.0
VOUT = -12V
4.5
VOUT = -15V
4.0
VOUT = -24V
3.5
3.0
VOUT = -5V
2.5
0.1
1
10
100
1000
LOAD CURRENT (mA)
EXT RISE AND FALL TIMES
vs. TEMPERATURE
500
CEXT = 5nF
450
400
5V RISE
350
300
250
5V FALL
200
12V RISE
150
100
12V FALL
50
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
MAX774
MAXIMUM LOAD vs. INPUT VOLTAGE
2200
VOUT = -5V
2000
1800
BOOTSTRAPPED
1600
1400
1200
NONBOOTSTRAPPED
1000
800
2
4 6 8 10 12 14 16
INPUT VOLTAGE (V)
SWITCH ON-TIME vs. TEMPERATURE
17
V+ = 5V
16
15
-60
0
60
120
TEMPERATURE (°C)
SWITCH OFF-TIME vs. TEMPERATURE
2.5
V+ = 5V
2.0
1.5
-60
0
60
120
TEMPERATURE (°C)
SWITCH ON-TIME/OFF-TIME RATIO
8.0
V+ = 5V
7.8
7.6
7.4
7.2
7.0
6.8
6.6
6.4
6.2
6.0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
SHUTDOWN CURRENT
vs. TEMPERATURE
4.0
3.5
3.0
2.5
V+ = 15V
2.0
1.5
1.0
V+ = 8V
0.5
V+ = 4V
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
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