Step-up dc-dc controller, Typical operating characteristics (continued) – Rainbow Electronics MAX1771 User Manual
Page 4
250
0
-60
-20
60
140
REFERENCE OUTPUT RESISTANCE vs.
TEMPERATURE
50
MAX1771-07
TEMPERATURE (
°C)
REFERENCE OUTPUT RESISTANCE (
Ω
)
20
100
150
-40
0
80
40
120
100
200
100µA
50µA
10µA
1.502
-60
-20
60
140
REFERENCE vs. TEMPERATURE
MAX1771-08
TEMPERATURE (
°C)
REFERENCE (V)
20
100
-40
0
80
40
120
1.500
1.498
1.496
1.494
1.492
1.504
1.506
15.5
16.0
16.5
-60 -30
0
30
60
90
120
150
MAXIMUM SWITCH ON-TIME vs.
TEMPERATURE
TEMPERATURE (°C)
t ON(MAX) (µs)
MAX1771-09
MAX1771
12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
4
_______________________________________________________________________________________
4.0
-60
-20
60
140
SHUTDOWN CURRENT vs. TEMPERATURE
MAX1771-10
TEMPERATURE (
°C)
SHUTDOWN CURRENT (µA)
20
100
-40
0
80
40
120
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V+ = 15V
V+ = 4V
V+ = 8V
2.20
2.25
2.30
-60 -30
0
30
60
90
120
150
MINIMUM SWITCH OFF-TIME vs.
TEMPERATURE
TEMPERATURE (°C)
t OFF(MIN) (µs)
MAX1771-11
6.0
7.0
8.0
-60 -30
0
30
60
90
120
150
MAXIMUM SWITCH ON-TIME/
MINIMUM SWITCH OFF-TIME RATIO
vs. TEMPERATURE
TEMPERATURE (°C)
t ON(MAX)/
t OFF(MIN) RATIO
MAX1771-12
7.5
6.5
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
0
1
2
3
4
-75
-50
-25
0
25
50
75
100 125
SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
V
OUT
= 12V, V
IN
= 5V
CIRCUIT OF FIGURE 2a
BOOTSTRAPPED MODE
ENTIRE
CIRCUIT
SCHOTTKY DIODE
LEAKAGE EXCLUDED
MAX1771-04
0
0.2
0.4
0.6
0.8
2
4
6
8
10
12
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
V
OUT
= 12V
NON-BOOTSTRAPPED
CIRCUIT OF FIGURE 2b
BOOTSTRAPPED
CIRCUIT OF
FIGURE 2a
MAX1771-05
0
100
150
200
250
50
2
4
6
8
10
12
EXT RISE/FALL TIME vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
EXT RISE/FALL TIME (ns)
C
EXT
= 2200pF
C
EXT
= 1000pF
C
EXT
= 446pF
C
EXT
= 100pF
MAX1771-06