-5V/-12V/-15V or Adjustable,
High-Efficiency, Low I
Q
Inverting DC-DC Controllers
_____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
START-UP VOLTAGE
vs. LOAD CURRENT (BOOTSTRAPPED)
MA744/5/6-14
MAX774/MAX775/MAX776
START-UP VOLTAGE
vs. LOAD CURRENT (NON-BOOTSTRAPPED)
MA744/5/6-15
MAX774
MAXIMUM LOAD vs. INPUT VOLTAGE
V
OUT
= -5V
2000
LOAD CURRENT (mA)
1800
BOOTSTRAPPED
1600
1400
1200
NON-BOOTSTRAPPED
1000
800
MAX774/5/6-16
5.0
V
OUT
= -15V
4.5
START-UP VOLTAGE (V)
V
OUT
= -12V
5.0
V
OUT
= -12V
4.5
START-UP VOLTAGE (V)
V
OUT
= -15V
2200
4.0
4.0
V
OUT
= -24V
3.5
V
OUT
= -5V
3.0
3.5
3.0
V
OUT
= -5V
2.5
1
10
100
1000
LOAD CURRENT (mA)
2.5
0.1
1
10
100
1000
LOAD CURRENT (mA)
2
4
6
8
10
12
14
16
INPUT VOLTAGE (V)
EXT RISE AND FALL TIMES
vs. TEMPERATURE
120
110
100
t
RISE &
t
FALL
(ns)
90
80
70
60
50
40
30
20
-60 -40 -20
0
20
40 60
80 100 120 140
TEMPERATURE (°C)
12V RISE
12V FALL
5V RISE
5V FALL
C
EXT
= 1nF
MAX774/5/6-9
EXT RISE AND FALL TIMES
vs. TEMPERATURE
C
EXT
= 5nF
MAX774/5/6-10
SWITCH ON-TIME vs. TEMPERATURE
V+ = 5V
MAX761-13
130
500
450
400
t
RISE &
t
FALL
(ns)
350
300
250
200
150
100
50
17
5V RISE
ton (µs)
5V FALL
12V RISE
12V FALL
15
-60 -40 -20
0
20
40 60
80 100 120 140
-60
0
60
120
TEMPERATURE (°C)
TEMPERATURE (°C)
16
SWITCH OFF-TIME vs. TEMPERATURE
MAX761-13
SWITCH ON-TIME/OFF-TIME RATIO
7.8
7.6
t
ON
/t
OFF
RATIO (µs/µs)
7.4
I
CC
(µA)
7.2
7.0
6.8
6.6
6.4
6.2
0.5
V+ = 5V
MAX774/5/6-6
SHUTDOWN CURRENT
vs. TEMPERATURE
3.5
3.0
2.5
2.0
1.5
1.0
V+ = 4V
0
V+ = 8V
V+ = 15V
MAX774/5/6-7
2.5
V+ = 5V
8.0
4.0
t
OFF
(µs)
2.0
1.5
-60
0
60
120
TEMPERATURE (°C)
6.0
-60 -40 -20
0
20
40 60
80 100 120 140
TEMPERATURE (°C)
-60 -40 -20
0
20
40 60
80 100 120 140
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
