MAX8686 Maxim Integrated Products, MAX8686 Datasheet - Page 5

• Manufacturer Part Number: MAX8686
• Description: DC-DC Converter Delivers Up To 25A Per Phase
• Manufacturer: Maxim Integrated Products

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1300
1200
1100
1000
(V
95.0
92.5
90.0
87.5
85.0
82.5
80.0
77.5
75.0
1.30
1.25
1.20
1.15
900
800
700
600
500
400
300
200
IN
DC-DC Converter Delivers Up to 25A Per Phase
100
6
0
= 12V, f
OUTPUT VOLTAGE vs. INPUT VOLTAGE
I
150
OUT
7
= 10A
200 250 300 350 400 450
8
SINGLE-PHASE EFFICIENCY
vs. CFREQ CAPACITANCE
SWITCHING FREQUENCY
5
V
9
OUT
CFREQ CAPACITANCE (pF)
SW
vs. LOAD CURRENT
10
INPUT VOLTAGE (V)
= 1.8V
LOAD CURRENT (A)
11
= 500kHz, single phase, circuit of Figure 2, unless otherwise noted.)
10
12
13
_______________________________________________________________________________________
14
AIRFLOW = 300 LFM
V
15
V
OUT
OUT
15
500 550
= 2.5V
16
= 3.3V
17
20
600
18
650
19
700
20
25
AC-COUPLED
200mV/div
42A/div
V
95.0
92.5
90.0
87.5
85.0
82.5
80.0
77.5
75.0
I
OUT
OUT
-10
-20
-30
-40
-50
50
40
30
20
10
Single/Multiphase, Step-Down,
0
0
1
CLOSED-LOOP FREQUENCY RESPONSE
vs. LOAD CURRENT (V
SINGLE-PHASE EFFICIENCY
OUTPUT LOAD TRANSIENT
(I
V
5
OUT
OUT
GAIN
LOAD CURRENT (A)
10
= 1.8V
= 160A, 8 PHASES)
FREQUENCY (Hz)
10
100µs/div
V
PHASE
OUT
CIRCUIT OF FIGURE 3
AIRFLOW = 300 LFM
CIRCUIT OF FIGURE 4
= 1.2V
AIRFLOW = 300 LFM
15
Typical Operating Characteristics
100
V
OUT
IN
= 5V)
= 2.5V
20
MAX8686 toc05
MAX8686 toc08
25
1k
180
144
108
72
36
0
-36
-72
-108
-144
-180
500mV/div
1.2040
1.2035
1.2030
1.2025
1.2020
1.2015
1.2010
1.2005
1.2000
2V/div
2V/div
5V/div
V
POK
OUT
87
86
85
84
83
82
81
80
79
EN
SS
OUTPUT VOLTAGE vs. OUTPUT CURRENT
0
5
AIRFLOW = 300 LFM
EFFICIENCY vs. LOAD CURRENT
SOFT-START WITH EN CONTROL
5
8
OUTPUT CURRENT (A)
LOAD CURRENT (A)
467kHz
(I
10
11
OUT
1ms/div
AIRFLOW = 300 LFM
= 10A)
270kHz
CIRCUIT OF FIGURE 4
564kHz
15
14
379kHz
20
17
MAX8686 toc09
5
25
20