Datasheet
MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
IN
= 12V, f
SW
= 500kHz, single phase, circuit of Figure 2, unless otherwise noted.)
SOFT-START WITH EN CONTROL
(I
OUT
= 10A)
MAX8686 toc10
1ms/div
EN
2V/div
SS
2V/div
POK
5V/div
V
OUT
500mV/div
CIRCUIT OF FIGURE 4
SHUTDOWN WITH EN CONTROL
(I
OUT
= 10A)
MAX8686 toc11
200
μ
s/div
EN
2V/div
SS
5V/div
POK
5V/div
V
OUT
500mV/div
CIRCUIT OF FIGURE 4
SHUTDOWN WITH EN CONTROL
(I
OUT
= 100A)
MAX8686 toc12
200
μ
s/div
EN
2V/div
SS
5V/div
POK
5V/div
V
OUT
500mV/div
CIRCUIT OF FIGURE 4
SHORT-CIRCUIT PROTECTION
MAX8686 toc13a
400
μ
s/div
I
OUT
42A/div
SS
500mV/div
POK
5V/div
V
OUT
500mV/div
SHORT-CIRCUIT RECOVERY
MAX8686 toc13b
400
μ
s/div
I
OUT
42A/div
SS
500mV/div
POK
5V/div
V
OUT
500mV/div
CURRENT-SHARING ACCURACY
MAX8686 toc14
LOAD CURRENT (A)
PHASE CURRENT (A)
130120100110
30 40 50 60 70 80 9010 20
2.5
5.0
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0
0
0
140
CIRCUIT OF FIGURE 4
AIRFLOW = 300 LFM
LX_ SWITCHING WAVEFORM FOR
PHASES 1, 2, 3, AND 4
MAX8686 toc15
200ns/div
LX1
5V/div
LX2
5V/div
LX3
5V/div
LX4
5V/div
CIRCUIT OF FIGURE 4