Datasheet

PHASE SHEDDING FROM 6 PHASES
TO 2 PHASES (I
OUT
= 30A)
MAX8686 toc18
1
μ
s/div
PS
2V/div
LX1
10V/div
LX5
10V/div
LX2
10V/div
CIRCUIT OF FIGURE 4
MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
_______________________________________________________________________________________ 7
PHASE RECOVERY FROM 2 PHASES
TO 6 PHASES (I
OUT
= 30A)
MAX8686 toc19
1
μ
s/div
PS
2V/div
LX1
10V/div
LX5
10V/div
LX2
10V/div
CIRCUIT OF FIGURE 4
SAFE OPERATING AREA
MAX8686 toc20
AMBIENT TEMPERATURE (°C)
I
OUT
(A)
807565 7035 40 45 50 55 6030
11
13
15
17
19
21
23
25
9
25 85
400 LFM
300 LFM
200 LFM
100 LFM
0 LFM
T
J
= +125°C, V
OUT
= 1.2V
SAFE OPERATING AREA
MAX8686 toc21
AMBIENT TEMPERATURE (°C)
I
OUT
(A)
807565 7035 40 45 50 55 6030
11
13
15
17
19
21
23
25
9
25 85
400 LFM
300 LFM
200 LFM
100 LFM
0 LFM
T
J
= +125°C, V
OUT
= 3.3V
LX_ SWITCHING WAVEFORM FOR
PHASES 4, 5, 6, AND 1
MAX8686 toc16
200ns/div
LX4
5V/div
LX5
5V/div
LX6
5V/div
LX1
5V/div
CIRCUIT OF FIGURE 4
REFO OUTPUT vs. TEMPERATURE
MAX8686 toc17
TEMPERATURE (
°
C)
REFO OUTPUT (V)
80706050403020100-10-20-30
3.28
3.29
3.30
3.31
3.32
3.33
3.27
-40 90
Typical Operating Characteristics (continued)
(V
IN
= 12V, f
SW
= 500kHz, single phase, circuit of Figure 2, unless otherwise noted.)