
M
5V /3.3V or Adjustable, 100% Duty-Cyc le,
High-Effic ienc y, S tep-Down DC-DC Controllers
____________________________Typic al Operating Charac teristic s (c ontinued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
4
_______________________________________________________________________________________
0
-60 -40
MAX1626 SHUTDOWN CURRENT
vs. TEMPERATURE
M
TEMPERATURE (°C)
S
μ
A
0.1
0.3
0.2
0.5
0.4
0.6
0.7
0.8
-20
0
20 40 60 80 100 120 140
E
C
B
A
D
APPLICATION CIRCUIT
SHUTDOWN CURRENT:
: V+ = +15V
: V+ = +10V
: V+ = +4V
MAX1626 SHUTDOWN
CURRENT:
: V+ = +16V
: V+ = +4V
400
0
0
2000
4000
EXT RISE AND FALL TIMES
vs. CAPACITANCE
50
100
300
250
350
M
CAPACITANCE (pF)
t
R
F
200
150
t
RISE
, V+ = +15V
t
FALL
, V+ = +5V
t
RISE
, V+ = +5V
t
FALL
, V+ = +15V
50
0
-60 -40 -20
40 60
140
EXT RISE AND FALL TIMES
vs. TEMPERATURE
10
5
15
40
35
45
M
TEMPERATURE (°C)
t
R
F
0
20
80
25
20
30
100 120
t
FALL
, V+ = +5V
C
= 1nF
3/5 = 0V
OUT = 50kHz, 0.3Vp-p
,
3.3V
DC
t
RISE
, V+ = +5V
t
RISE
, t
FALL
, V+ = +15V
60
-60 -40
MAX1626
V+ QUIESCENT CURRENT
vs. TEMPERATURE
M
TEMPERATURE (°C)
I
Q
μ
A
62
64
66
68
70
72
-20
0
20 40 60 80 100 120 140
3/5 = 0V
OUT FORCED TO 3.4V
V+ = +16V
V+ = +10V
V+ = +4V
12
0
0
1
2
3
4
5
MAX1626 EXT OFF TIME
vs. OUTPUT VOLTAGE
2
8
10
M
OUTPUT VOLTAGE (V)
E
μ
s
6
4
V+ = +5V
3/5 = GND
3/5 = V+
12
0
0
0.2
0.4
FB PIN VOLTAGE (V)
0.6
0.8
1.0
1.2
1.4
MAX1627 EXT OFF TIME
vs. FB PIN VOLTAGE
2
8
10
M
E
μ
s
6
4
V+ = +5V
115
85
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
CS TRIP LEVEL vs. TEMPERATURE
90
105
110
M
C
100
95
OUT = 0V