Typical operating characteristics (continued) – Rainbow Electronics MAX1842 User Manual
Page 6
MAX1742/MAX1842
1A/2.7A, 1MHz, Step-Down Regulators with
Synchronous Rectification and Internal Switches
6
_______________________________________________________________________________________
0V
0V
0V
0A
MAX1742
STARTUP AND SHUTDOWN
I
INPUT
1A/div
V
OUTPUT
1V/div
V
SS
2V/div
MAX1742 toc06
1ms/div
V
SHDN
5V/div
0V
MAX1742
LOAD-TRANSIENT RESPONSE
V
OUTPUT
AC-COUPLED,
50mV/div
I
L
0.5A/div
MAX1742 toc07
10
µs/div
0V
MAX1742
LINE-TRANSIENT RESPONSE
V
INPUT
2V/div
V
OUTPUT
20mV/div
AC-COUPLED
MAX1742 toc08
20
µs/div
I
OUT
= 1A, V
OUT
= 1.5V, R
TOFF
= 100k
Ω, L = 6µH
0
150
100
50
200
250
300
350
400
450
500
0
30
20
10
40
50
60
70
80
90
100
0
2
1
3
4
5
6
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1742 toc09
V
IN
(V)
NO-LOAD SUPPLY CURRENT, I
IN
+ I
CC
(µ
A)
SHUTDOWN SUPPLY CURRENT, I
IN
+ I
CC
(nA)
NO LOAD
SHUTDOWN
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
0
1.0
0.5
2.0
1.5
3.0
2.5
3.5
4.5
4.0
5.0
0
100 150 200
50
250 300 350
450
400
500
OFF-TIME vs. R
TOFF
MAX1742 toc10
R
TOFF
(k
Ω)
t
OFF
(µ
s)