Datasheet

SOFT-START AND SOFT-STOP WAVEFORM
MAX1858 toc07
1ms/div
0V
1V/div
V
OUT2
V
OUT1
1V/div
5V
0V
V
EN
0V
RESET TIMEOUT
MAX1858 toc08
100ms/div
V
OUT1
0V
0V
0V
V
OUT2
5V/div
0V
EN
V
RST
OUT-OF-PHASE WAVEFORM
MAX1858 toc09
1
µ
s/div
V
OUT1
20mV/div
V
OUT2
20mV/div
12V
V
LX1
V
LX2
0V
0V
12V
MAX1858
Dual 180° Out-of-Phase PWM Step-Down
Controller with Power Sequencing and POR
_______________________________________________________________________________________ 5
EXTERNALLY SYNCHRONIZED
SWITCHING WAVEFORM
MAX1858 toc10
400ns/div
V
OUT1
10mV/div
AC-COUPLED
5V
5V
0V
0V
V
SYNC
V
CK0
V
LX1
10V
0V
CKO OUTPUT WAVEFORM
MAX1858 toc11
V
OUT1
10mV/div
AC-COUPLED
5V
0V
V
CK0
V
LX1
10V
0V
SYNC = GND
400ns/div
SHORT-CIRCUIT CURRENT
FOLDBACK AND RECOVERY
MAX1858 toc13
I
OUT1
= 10A (5A/div)
V
OUT1
= 1.8V (1V/div)
V
OUT2
= 2.5V (1V/div)
I
OUT2
= 10A (5A/div)
SHORT
V
OUT2
CKO OUTPUT WAVEFORM
MAX1858 toc12
400ns/div
V
OUT1
10mV/div
5V
0V
V
CK0
V
LX1
10V
0V
SYNC = V
L
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, T
A
= +25°C, unless otherwise noted.)