Typical operating characteristics – Rainbow Electronics MAX8707 User Manual
Page 9
MAX8707
Multiphase, Fixed-Frequency Controller for
AMD Hammer CPU Core Power Supplies
_______________________________________________________________________________________
9
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.525V)
MAX8707 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
10
60
70
80
90
100
50
1
100
V
IN
= 8V
V
IN
= 12V
V
IN
= 20V
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.300V)
MAX8707 toc02
LOAD CURRENT (A)
EFFICIENCY (%)
10
60
70
80
90
100
50
1
100
V
IN
= 8V
V
IN
= 12V
V
IN
= 20V
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.000V)
MAX8707 toc03
LOAD CURRENT (A)
EFFICIENCY (%)
10
60
70
80
90
100
50
1
100
V
IN
= 8V
V
IN
= 12V
V
IN
= 20V
Typical Operating Characteristics
(Circuit of Figure 1. V
IN
= 12V, V
CC
= 5V, SUS = SKIP = GND, SHDN = V
CC
, V
SUSV
= 0.80V, T
A
= +25°C, unless otherwise specified.)
OUTPUT VOLTAGE DEVIATION
vs. LOAD CURRENT
MAX8707 toc04
LOAD CURRENT (A)
OUTPUT VOLTAGE (mV)
60
40
20
-100
-80
-60
-40
-20
0
20
-120
0
80
V
OUT
= 1.00V
V
OUT
= 1.30V
V
IN
= 12V
SINGLE-PHASE
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 0.800V)
MAX8707 toc05
LOAD CURRENT (A)
EFFICIENCY (%)
1
10
60
70
80
90
100
50
0.1
100
V
IN
= 8V
V
IN
= 12V
V
IN
= 20V
SKIP = SUS = V
CC
0
50
100
150
200
0
5
10
15
20
25
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(4-PHASE FORCED-PWM MODE)
MAX8707 toc06
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
I
BIAS
I
IN
SKIP = V
CC
0
2
6
4
8
10
0
10
5
15
20
25
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(1-PHASE PULSE SKIPPING)
MAX8707 toc07
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
SKIP = GND
I
BIAS
I
IN
= 15
µA
OUTPUT OFFSET VOLTAGE
vs. OFS VOLTAGE
MAX8707 toc08
OFS VOLTAGE (V)
OUTPUT OFFSET VOLTAGE (mV)
1.5
1.0
0.5
-100
-50
0
50
100
150
-150
0
2.0
UNDEFINED
REGION
REFERENCE VOLTAGE
DISTRIBUTION
MAX8707 toc09
REFERENCE VOLTAGE (V)
SAMPLE PERCENTAGE (%)
2.005
2.000
1.995
10
20
30
40
50
0
1.990
2.010
SAMPLE SIZE = 100