MAX1771 Maxim, MAX1771 Datasheet - Page 4

• Manufacturer Part Number: MAX1771
• Description: 12V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controller
• Manufacturer: Maxim

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12V or Adjustable, High-Efficiency,
Low I
(T
4
____________________________Typical Operating Characteristics (continued)
A
250
200
150
100
= +25°C, unless otherwise noted.)
_______________________________________________________________________________________
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
50
4
3
2
1
0
0
0
-75 -50 -25
-60
-60
SHUTDOWN CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
REFERENCE OUTPUT RESISTANCE vs.
V
CIRCUIT OF FIGURE 2a
BOOTSTRAPPED MODE
OUT
-40
-40
= 12V, V
-20
V+ = 4V
-20
SCHOTTKY DIODE
LEAKAGE EXCLUDED
Q
TEMPERATURE (°C)
TEMPERATURE ( C)
TEMPERATURE ( C)
0
V+ = 8V
TEMPERATURE
0
, Step-Up DC-DC Controller
IN
0
20
20
= 5V
25
50µA
40
40
ENTIRE
CIRCUIT
60
60
50
10µA
80
V+ = 15V
80
75 100 125
100
100
100µA
120
120
140
140
1.506
1.504
1.502
1.500
1.498
1.496
1.494
1.492
2.30
2.25
2.20
0.8
0.6
0.4
0.2
0
-60 -30
-60
SUPPLY CURRENT vs. SUPPLY VOLTAGE
2
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NON-BOOTSTRAPPED
CIRCUIT OF FIGURE 2b
-40
MINIMUM SWITCH OFF-TIME vs.
REFERENCE vs. TEMPERATURE
-20
4
SUPPLY VOLTAGE (V)
0
TEMPERATURE (°C)
TEMPERATURE ( C)
0
TEMPERATURE
BOOTSTRAPPED
CIRCUIT OF
FIGURE 2a
6
20
30
40
60
8
60
V
80
90
OUT
10
100
= 12V
120 150
120
12
140
16.5
16.0
15.5
6.0
250
200
150
100
8.0
7.5
7.0
6.5
50
0
EXT RISE/FALL TIME vs. SUPPLY VOLTAGE
-60 -30
-60 -30
2
MINIMUM SWITCH OFF-TIME RATIO
MAXIMUM SWITCH ON-TIME vs.
MAXIMUM SWITCH ON-TIME/
4
vs. TEMPERATURE
SUPPLY VOLTAGE (V)
0
TEMPERATURE (°C)
0
TEMPERATURE (°C)
TEMPERATURE
6
30
30
C
C
C
C
EXT
EXT
EXT
EXT
= 2200pF
= 1000pF
= 446pF
= 100pF
60
60
8
90
90
10
120 150
120 150
12