Typical operating characteristics (continued) – Rainbow Electronics MAX1774 User Manual
Page 9
MAX1774
Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
_______________________________________________________________________________________
9
CORE SWITCHING WAVEFORMS
(HEAVY LOAD 500mA)
MAX1774-09
2
µ
s/div
4V
2V
0
20mV
0
-20mV
500mA
0
V
CORE
(AC-COUPLED)
20mV/div
L2
500mA/div
LXC
2V/div
CORE LINE-TRANSIENT RESPONSE
MAX1774-11
V
INC
2V/div
0
2V
4V
V
CORE
(AC-COUPLED)
50mV/div
1
µ
s/div
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= +5V, V
INC
= +3.3V, T
A
= +25°C, unless otherwise noted.)
CORE SWITCHING WAVEFORMS
(LIGHT LOAD 50mA)
MAX1774-08
1
µ
s/div
3.3V
LX
2V/div
0
0
I
L2
500mA/div
500mA
V
CORE
(AC-COUPLED)
20mV/div
MAIN LOAD-TRANSIENT RESPONSE
MAX1774-12
1000mA
500mA
0
I
MAIN
500mA/div
-20mV
V
MAIN
(AC-COUPLED)
20mV/div
20mV
0
100
µ
s/div
MAIN LOAD-TRANSIENT RESPONSE
50mA TO 500mA
MAX1774-13
500mA
0
V
MAIN
(AC-COUPLED)
10mV/div
I
MAIN
500mA/div
10mV
0
-10mV
100
µ
s/div
MAIN LINE-TRANSIENT RESPONSE
MAX1774-10
12V
5V
0
50mV
-50mV
10V
V
IN
5V/div
V
MAIN
(AC-COUPLED)
50mV/div
100
µ
s/div