Datasheet

MAX1858
Dual 180° Out-of-Phase PWM Step-Down
Controller with Power Sequencing and POR
4 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= 12V, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD
MAX1858 toc01
LOAD (A)
EFFICIENCY (%)
101
10
20
30
40
50
60
70
80
90
100
0
0.1 100
OUT2
OUT1
OUTPUT-VOLTAGE ACCURACY vs. LOAD
MAX1858 toc02
LOAD (A)
OUTPUT VOLTAGE ACCURACY (%)
105
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
015
OUT2
OUT1
V
L
VOLTAGE ACCURACY
vs. LOAD CURRENT
MAX1858 toc03
LOAD CURRENT (mA)
V
L
VOLTAGE ACCURACY
10050
-1.5
-1.0
-0.5
0
0.5
-2.0
0 150
SWITCHING FREQUENCY vs. R
OSC
MAX1858 toc04
R
OSC
(kΩ)
SWITCHING FREQUENCY (kHz)
5040302010
100
200
300
400
500
600
0
060
LOAD TRANSIENT RESPONSE (OUTPUT 1)
MAX1858 toc05
10µs/div
0A
I
OUT1
10A
V
OUT2
50mV/div
AC-COUPLED
V
OUT1
50mV/div
AC-COUPLED
LOAD TRANSIENT RESPONSE (OUTPUT 2)
MAX1858 toc06
10µs/div
0A
I
OUT2
10A
V
OUT1
50mV/div
AC-COUPLED
V
OUT2
50mV/div
AC-COUPLED