5 V/3 .3 V o r Ad ju s t a b le , 1 0 0 % Du t y-Cyc le ,
Hig h -Effic ie n c y, S t e p -Do w n DC-DC Co n t ro lle rs
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 1, T = +25°C, unless otherwise noted.)
A
MAX1626 EXT OFF TIME
vs. OUTPUT VOLTAGE
MAX1627 EXT OFF TIME
vs. FB PIN VOLTAGE
MAX1626 SHUTDOWN CURRENT
vs. TEMPERATURE
12
12
10
8
0.8
APPLICATION CIRCUIT
SHUTDOWN CURRENT:
A: V+ = +15V
A
V+ = +5V
V+ = +5V
0.7
0.6
0.5
0.4
0.3
0.2
10
8
B: V+ = +10V
C: V+ = +4V
B
MAX1626 SHUTDOWN
CURRENT:
C
6
4
6
4
D: V+ = +16V
E: V+ = +4V
3/5 = V+
D
E
3/5 = GND
2
0
2
0
0.1
0
0
1
2
3
4
5
0
0.2 0.4
0.6 0.8 1.0 1.2 1.4
-60
40
140
60 80 100 120
-40 -20
0
20
OUTPUT VOLTAGE (V)
FB PIN VOLTAGE (V)
TEMPERATURE (°C)
/MAX1627
EXT RISE AND FALL TIMES
vs. CAPACITANCE
EXT RISE AND FALL TIMES
vs. TEMPERATURE
400
350
300
250
50
45
40
35
30
25
t
, V+ = +5V
FALL
t
, V+ = +5V
RISE
t
, V+ = +15V
RISE
200
150
100
t , V+ = +5V
FALL
20
15
10
5
t
, t , V+ = +15V
RISE FALL
t
, V+ = +5V
RISE
C
= 1nF
EXT
3/5 = 0V
OUT = 50kHz, 0.3Vp-p 3.3V
50
0
,
DC
t
, V+ = +15V
FALL
0
0
2000
CAPACITANCE (pF)
4000
0
-60 -40 -20
20 40 60 80 100 120 140
TEMPERATURE (°C)
MAX1626
V+ QUIESCENT CURRENT
vs. TEMPERATURE
CS TRIP LEVEL vs. TEMPERATURE
115
110
105
72
OUT = 0V
V+ = +16V
70
68
66
64
V+ = +10V
V+ = +4V
100
95
90
85
62
60
3/5 = 0V
OUT FORCED TO 3.4V
-60 -40 -20
0
20 40 60 80 100 120 140
-60
40
140
60 80 100 120
-40 -20
0
20
TEMPERATURE (°C)
TEMPERATURE (°C)
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
